Country：Japan

Country：Japan

Country：Japan

Country：Japan

Country：Japan

Country：Japan

Country：Japan

Country：Japan

Publishing type：Research paper (scientific journal)   International / domestic magazine：International journal  

DOI： 10.1002/ceat.202300065

Authorship：Last author   Publishing type：Research paper (scientific journal)   International / domestic magazine：Domestic journal  

Authorship：Last author   Publishing type：Research paper (scientific journal)   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   International / domestic magazine：International journal  

DOI： 10.3303/CET23100052

Publishing type：Research paper (scientific journal)   International / domestic magazine：International journal  

This study experimentally and numerically investigated the thermo-fluid dynamics of Taylor-Couette flow with an axial temperature gradient from the chemical engineering perspective. A Taylor-Couette apparatus with a jacket vertically divided into two parts was used in the experiments. Based on the flow visualization and temperature measurement for glycerol aqueous solutions with various concentrations, the flow pattern was classified into six modes: heat convection dominant mode (Case I), heat convection-Taylor vortex flow alternate mode (Case II), Taylor vortex flow dominant mode (Case III), fluctuation maintaining Taylor cell structure mode (Case IV), segregation between Couette flow and Taylor vortex flow mode (Case V) and upward motion mode (Case VI). These flow modes weremapped in terms of the Reynolds and Grashof numbers. Cases II, IV, V and VI are regarded as transition flow patterns between Case I and Case III, depending on the concentration. In addition, numerical simulations showed that in Case II, heat transfer was enhanced when the Taylor-Couette flow was altered by heat convection. Moreover, the average Nusselt number with the alternate flow was higher than that with the stable Taylor vortex flow. Thus, the interaction between heat convection and Taylor-Couette flow is an effective tool to enhance heat transfer.This article is part of the theme issue 'Taylor-Couette and related flows on the centennial of Taylor's seminal Philosophical Transactions paper (Part 2)'.

DOI： 10.1098/rsta.2022.0116

Authorship：Last author   Publishing type：Research paper (scientific journal)   International / domestic magazine：Domestic journal  

Authorship：Last author   Publishing type：Research paper (scientific journal)   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   International / domestic magazine：International journal  

Publishing type：Research paper (scientific journal)   International / domestic magazine：International journal  

DOI： 10.1002/ceat.202100236

Publishing type：Research paper (scientific journal)  

<p>It was shown that the color of materials in a closed space can be measured from the outside of space under diffuse illuminations by using a concave glass as a partition. The measurement accuracy is <i>ΔE*_ab</i> = 0.9 in average for 24 colors of the standard color chart, where <i>ΔE*_ab</i> is the color difference in <i>L*a*b*</i> (D65/ 2-deg.) color space of JIS Z8781-4. It is lower than that of the conventional colorimetry without a glass partition, in which the measurement accuracy is <i>ΔE*_ab</i> = 0.7 in average; it is, however, high enough compared to that of visual colorimetry.</p>

DOI： 10.3130/aijt.27.1166

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

DOI： 10.1016/j.ces.2020.116270

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

DOI： 10.1080/07373937.2017.1403926

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

DOI： 10.1007/s10765-017-2266-y

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

In the process of heat-treating of materials during food processing by employing hot air or high temperature steam, the gas flow temperature, humidity, and pressure significantly affect the processed materials. In this study, we developed a humidity-measuring device that can continuously measure hot air flow above the boiling point. The measuring method is based on the principle of the psychrometer. Porous ceramics processed by injection molding are used as the wetted material for a wet-bulb thermometer. Accuracy is evaluated by using a humidity generator that can generate arbitrary humidity over 100°C of humid air to superheated steam. The measurements were conducted under gas flow temperatures ranging from 160°C to 300°C, and at a gas flow velocity of 3 m/s.

DOI： 10.2963/jjtp.30.9

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

This study investigated the effects of cooking and placement conditions, heat capacity of an oven plate, and thickness of meat samples upon change in their internal temperatures after oven cooking.In the condition wherein the oven plate was covered after oven cooking, the internal temperature of the samples was maintained at over 75°C. This temperature was maintained for a longer duration than that for the condition wherein the samples were not covered. The heat capacity of the oven plate (weight-to-area ratio) affected the retention time of the central temperature (over 75°C) of the samples. The thickness of the samples had negligible effect on the retention time. The retention time of the central temperature (over 75°C) of the samples was predicted using the improved calculation model. The values of the calculated time were similar to those obtained through actual measurement, which confirmed the validity of the heat transfer model.

DOI： 10.11402/cookeryscience.49.26

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

This study analysed the effects of the heating capacity of oven plates and the heating ability of ovens on the internal temperature of meat after oven cooking at 230°C. The temperature of the samples increased with the increase in the heating ability of ovens. Further, the overall temperature after cooking increased with the increase in the heating capacity of the oven plates, and the time required to attain an internal temperature exceeding 75°C also increased.As the duration of covering the samples after heating was reduced, the percentage of weight reduction decreased, and the samples became softer. These findings revealed that covering the cooked meat until a maximum internal temperature was attained kept it hygienic and enhanced its taste.

DOI： 10.11402/cookeryscience.49.35

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

DOI： 10.9746/sicetr.52.707

Publishing type：Research paper (scientific journal)  

<p>In a previous paper, we reported on the performance of a device developed for rice seed disinfection. To treat the rice seed such that its temperature after heating (<i>T_fin</i>) is 75±1°C，the device elicits a control effect equivalent to or more effective than the conventional hot water treatment against rice seed-borne diseases, and without the negative effect of excess heat on seed germination. In this study, we aimed to develop a process control method for <i>T_fin</i> using Predictive Functional Control. In particular, we aimed to calibrate and validate a prediction model for <i>T_fin</i> using the process conditions of the device. We created a multiple linear regression model to predict <i>T_fin</i>, which uses gas humidity, heating time, and other process conditions as predictor variables. The model can predict <i>T_fin</i> within the standard error of 0.5°C in the range of 66.0 to 82.7°C. This result indicates that it is possible to apply the model for device operation and control.</p>

DOI： 10.11357/jsamfe.78.1_95

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

The objective of this study was to use a quasi-experimental design with a control group to verify the effectiveness of an education program, and to investigate the effects of improved energy-conservation awareness on students' behavioral intention using the visualization method. The education group improved for all factors following the program, and a significant difference was observed in their "motivation to learn about energy" after the program compared to before (p<0.05). Further, their "usefulness of visualization" improved significantly compared to the control group (p<0.05). In addition, excellent goodness of fit was obtained for the model of the improvement of behavioral intention. Based on these results, it was determined that the implementation of this energy-conservation education program using the "visualization method" was effective, with the results suggesting that this method, along with the increased awareness through visual experience, can contribute to the formation of attitudes and increase behavioral intention. This educational system in an energy-conservation program using the visualization method was effective. Moreover, a model of the mechanism for the improvement of behavioral intention for energy conservation was presented.

DOI： 10.14986/shokuiku.9.177

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)  

Hot air, both dry and moist, has been widely used for heating and/or a reaction atmosphere in a broad range of industrial fields including food processing, material drying, and other heat treatments. In a process that uses hot air and superheated steam, the gas flow temperature, pressure, and humidity inside the treatment chamber have a major impact on the quality of the finished product. However, there is no simple method of measuring humidity that can be used over an extended duration in applications that use superheated steam at temperatures above 100°C. In this paper, we introduce a device developed for measuring humidity, which consists of a wetted porous ceramic probe with thermocouples, a water retention control system, and computing devices. The measured humidity (steam mole fraction) is calculated from the measured wet- and dry-bulb temperatures using the adiabatic saturation line equation on which we previously reported. The equation was extended to enable its application to temperatures of up to 350°C and a humidity up to that of superheated steam. Accuracy measurements were conducted with a humidity generator and a gas flow temperature of 200°C, a gas flow velocity of 3 m/s, and steam mole fraction ranging from that of hot air to that of superheated steam. The cause of any errors was investigated.

DOI： 10.18462/iir.icr.2015.0349

Publishing type：Research paper (scientific journal)  

DOI： 10.11455/kitanihon.2015.66_13

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

In order to raise efficiency and to reduce the costs associated with chemical-free, environment-friendly disinfection methods for rice seed, we propose a rice seed disinfection method that uses steam heating. This method aims to sterilize the surface of rice seeds with wet heat using steam condensation, and to simplify the cooling and drying process compared with the conventional hot water treatment.<BR>To investigate the applicability of this method and determine the optimal conditions for rice seed disinfection, we examined the effects of heating air temperature, air humidity, air flow rate, and heating time on the sterilization rate and germination rate of rice seeds. We found that the optimal conditions were as follows : heating with an air temperature of 200°C, and wet bulb temperature of 80°C, a heating time of 2s, an air flow rate of 1.8m/s, and cooling by ventilation with ambient air for more than 60 s. Using these optimal conditions, the newly described disinfection method was as effective against blast and bacterial grain rot as the conventional hot water treatment.

DOI： 10.11357/jsamfe.76.6_555

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

This paper presents the feasibility of solar thermal energy utilization to plant factory. Performance and operationcharacteristics of the solar driven absorption chiller heater of 352 kilowatt refrigeration capacity were investigated byusing long term demonstration test data of June 2009 to October 2013. Effects of solar insolation to the absorption chillerheater performance were examined by changes of air conditioning load ratio and solar position. As a result, it wasdemonstrated that the COP in case of parallel operation by solar energy and town gas becomes 20 to 50 percent higher thanthat case of another operation modes. Also, Seasonal performance of the system is calculated based on the appearancefrequency (weight) of the outdoor temperature. The air-conditioning load ratio was sorted out for every outdoortemperature based on the data measured during 5 seasons from 2009 to 2013 to obtain the averaged COP value. COP takesthe maximum value at the air-conditioning load ratio of 30% and decreased at both higher and lower ratios than that.

DOI： 10.11322/tjsrae.14-24_PF

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

DOI： 10.3136/fstr.19.939

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)  

In order to improve the utility of cooking ovens, we conducted heat transfer mechanism analyses of a convection/steam combined oven by focusing on steam condensation. Spherical wet gauzes were used as the sample material. The heat transfer mechanisms were analyzed by considering the heat balance on the surface of the spherical gauze using the measured mass change of the sample. the temperature change of the sample surface and gas flow. In this manner, we could estimate the heat flux in terms of heat transfer and heat flux changes with time. The estimated data were used to generate diagrams that visually depicted the heat transfer mechanisms in terms of heat flux changes with time. The diagrams provided to visually understand and compare each heat transfer quantity. incremental moisture content and heat quantity generated because of steam condensation on the sample material, as well as drying rates under different heating conditions. In addition, the heat transfer mechanism of a steam convection oven was analyzed using this method. We analyzed the effects of each setting condition (e.g., temperature, humidity. and velocity) on the heat flux, moisture content, and temperature of the sample material during heating. From the analysis results, it was possible to understand and compare the heating characteristics between oven types, and to set the proper conditions for achieving optimal oven heating.

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Two kinds of directional retroreflective materials are manufactured, which are designed to show abrupt change in reflectance at the incident angle (&Theta;) of around 30 degrees. The measured solar reflectances are 17.7 percent for &Theta; &ge; 40 deg. and 39.0 percent for &Theta; &le; 20 deg. for one type; 54.4 percent and 40.8 percent for the other. Building materials having these kinds of incident angle dependences can be used as cool roofs free of side effect; they can be high-reflective exclusively against summer sunlight, and low-reflective against other light sources, such as, winter sunlight, headlights of cars, and street lights.

DOI： 10.3130/aijs.76.1229

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

DOI： 10.1080/07373931003788650

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

System performance prediction model for air-cooled air conditioner has been developed, and influences of Grooved tubes on performance of air conditioners with R410A were quantitatively investigated. Calculated results with simulation model correspond approximately to measured results by the authors and other researchers. After that, performances of air conditioners with grooved tubes were predicted. Results show that condensation heat transfer coefficients decrease with the rise of air conditioning load rate, and boiling heat transfer coefficients increase with the rise of air conditioning load rate. On the other hand, pressure drops increase 1.2-1.4 times in evaporator. Then, COPs of air conditioners with the grooved tube are 1.16 times higher than COP of air-conditioners with the smooth tube.

DOI： 10.11322/tjsrae.27.11

CiNii Article

Publishing type：Research paper (scientific journal)  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

DOI： 10.11395/jjsem.9.s48

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

A theoretical and experimental study is conducted to investigate the detached volume from the pendant drop on sphere surface. From the observation of droplet detachment by use of a high speed video camera, the movement of upper part from the neck of droplet is quite slow compared with that of detaching lower part. The surface profile of upper part was calculated approximately as a static problem by using the axi-symmetric Laplace equation. Using the droplet profile, the system energy was calculated including the work done by the solid-liquid wetting behavior. Based on the condition of energy minimum, the volume of upper part was determined among the solutions satisfying the boundary conditions and the volume of detached part V was calculated. The volume V increases with the sphere diameter and approaches to that for the plate. V is strongly dependent on the wettability between sphere and liquid, and decreases with the receding contact angle. The detached volume of water droplet was measured for spheres of porous brick with various diameters. The results agreed well with theoretical ones obtained in this study.

DOI： 10.1299/kikaib.75.755_1503

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

The simple and noninvasive measuring methods of bioinstrumentation in humans is required for optimization of air conditioning and management of thermal environments, taking into consideration the individual specificity of the human body as well as the stress conditions affecting each. Changes in human blood circulation were induced with environmental factors such as heat, cold, exercise, mental stress, and so on. In this study, the physiological responses of human body to heat stress and exercise were investigated in the initial phase of the developmental research. We measured the body core and skin temperatures, skin blood flow, and pulse wave as the indices of the adaptation of the cardiovascular system. A laser Doppler skin blood flowmetry using an optical-sensor with a small portable data logger was employed for the measurement. These results reveal the heat-stress and exercise-induced circulatory responses, which are under the control of the sympathetic nerve system. Furthermore, it was suggested that the activity of the sympathetic nervous system could be evaluated from the signals of the pulse wave included in the signals derived from skin blood flow by means of heart rate variability assessments and detecting peak heights of velocity-plethysmogram.

DOI： 10.11322/tjsrae.26.121

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

A novel simple measuring method of actual performance of room air-conditioners by neural net work analysis (NNW) has been developed. The actual performance for a long term which is difficult to be measured by air enthalpy method is able to be measured easily by this method. In other words, actual performance of room air-conditioners can be measured by the proposed NNW method without measurement of air flow at indoor unit and outdoor unit which changes due to clogging of heat exchanger by dust. In order to gather data for training and testing the proposed NNW method, the room air-conditioner for experiment was set up. Inputs to NNW are outdoor temperature, indoor temperature, indoor wet-bulb temperature, inlet temperature of evaporator, outlet temperature of evaporator, condensation temperature and power consumption. The output from NNW is COP. The COP by NNW method has mean errors under 2.8% in quasi-steady operation condition and has mean errors under 4.6% in unsteady operation condition, compared to the COP of air enthalpy method. Results show that the COP of air conditioners can be measured easily for a long term using NNW within a high degree of accuracy.

DOI： 10.11322/tjsrae.26.93

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Time changes of air conditioning exhaust heats distribution in Osaka city were estimated by energy supplies both electricity and town gas for the purpose of clarifying the space-time characteristics of the air conditioning exhaust heat. Energy supplies both by electricity and town gas were divided into building uses and air conditioners use. According to comparison between methods by energy supplies both electricity and town gas and methods by basic units of energy consumption, sensible heat from the air conditioner which is estimated by energy supplies both electricity and town gas was extremely large in a commercial and amusement district at night. Then, a temperature rise in the city gave biggest influence for air conditioner's exhaust heat in the district which is investigated this report. A temperature rise of 1.5 to 6.0 degrees Celsius involves a sensible exhaust heat from air conditioners increase of 70 to 140W/m^2 in the commercial and amusement district.

DOI： 10.18948/shase.33.138_29

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Micro-scale distributed power generation system, which means a micro-cogeneration system in almost cases, has been paid a great attention from a standpoint of saving fossil fuels' consumption and preventing global warming. Especially, polymer electrolyte fuel cell (PEFC) is considered the most promising power generation system for small scale commercial use and residential use. In the PEFC cogeneration system, small amount of waste heat at low temperature from a cell stack is almost used to produce hot water. Therefore, in the paper, we proposed a new heat utilization method of the waste heat for air conditioning. In the proposed home cogeneration system, absorption refrigerator is introduced in order to produce chilled water. Thermal performances of the proposed system have been analyzed by a computer simulation which was developed for the prediction both of power generation characteristics of PEFC and absorption refrigerator's behavior.

DOI： 10.11322/tjsrae.24.13

CiNii Article

Publishing type：Research paper (scientific journal)  

A simple method was proposed for estimating drying rate from the material temperature change in a drying process. This method was applied to convective and combined convective-conductive dryings of a thin glass-particle layer, i.e., non-hygroscopic porous slab, and to convective drying of a PVA solution film. The method was proved to be useful except for two cases; the period when the temperature rise of the drying material is not accompanied by moisture evaporation; and the period when the quantity of moisture evaporating is small with the change in material temperature is extremely small. The proposed method can be applied to estimate drying rate of a coated web in a rapid drying using hot air, where the conventional method of estimating drying rate from mass change data is difficult to apply.

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Split type air conditioners are operated actually in the situation unlike the condition that was described in a product catalog. On the other hand, exhaust heat from air conditioner is considered as one of the causes of heat island problem in urban area, and the air conditioner performance and heat load affect exhaust heat amount. In this study, air conditioner performances in both standard summer day and severe hot day were examined by dynamic simulation which considered outdoor weather changes. As a result, actual performances of the air conditioner were demonstrated as a function of outdoor temperature, heat load and indoor temperature. The higher the outdoor temperature and heat load rise, the smaller influences of indoor temperature against COP became. In standard summer day, relative performance exceeded by 15 to 45% than that of JIS operating condition. Also, COP in severe hot day decreased about 6% at the peak time than that of standard day. As a result, the air conditioner exhaust heat during one day which was predicted by the proposed simulation model became about 16% smaller than the conventional prediction model.

DOI： 10.11322/tjsrae.24.447

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Amaranth seeds have a high nutritional value, and predisposition for popping when heated under proper conditions, accompanied by evaporation of contained water. Popping can be an effective and beneficial method for food processing. In this study, regulation and measurement of moisture content and its relationship to the mechanical properties of the amaranth seed were investigated. The effect of initial moisture content and gas temperature on expansion ratio, seed shape and browning, using hot air and superheated steam as heating media with a special fluidized bed for popping, was also studied. As a result, the maximum volume of the samples after popping was 8.7 times higher than the raw samples' volume, provided that the initial moisture content of the raw samples was 0.15 kg/kg, using hot air at 260°C for 15 seconds. In the case of superheated steam, the optimum moisture content was slightly lower than that of hot air, and the expansion ratio was measurably lower because the seed coat was softened by initial steam condensation. The optimum condition for regulation of seed moisture content for popping was determined from the water sorption isotherm, with the optimum moisture content located just before the moisture content started to increase at a faster rate, with increasing relative humidity. The results of rheometer measurements showed that the degree of elasticity decreased and yield load was nearly constant when the moisture content was higher than the optimum value of 0.15.

DOI： 10.1252/kakoronbunshu.32.167

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

DOI： 10.1081/DRT-200059502

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

Publishing type：Research paper (international conference proceedings)   Kind of work：Joint Work   International / domestic magazine：International journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Drying by use of atmospheric superheated steam (SHS) as a drying medium has various characteristics: the materials to be dried are heated rapidly by steam condensation, they are sterilized and their oxidization at high temperature is reduced in comparison with that when air is used. Therefore this drying method is petentially applicable to food processing.<br>In this study, coloring of raw sliced potatoes during SHS drying and hot air drying at 170°C and 240°C under atmospheric pressure was investigated. The results showed that starch granules remained at the surface of the samples dried with hot air, but no starch granules remained after the SHS drying. The potato slices dried with SHS were found to be darker in color and to have a glossier surface. Starch gelatinization proceeded more rapidly in SHS drying, than in hot air drying, and amounts of low molecular weight carbohydrates and free amino acids produced, which are thought to contribute to coloring, were higher in SHS drying than in hot air drying.

DOI： 10.1252/kakoronbunshu.29.94

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Effects of an addition of surfactant to a lithium bromide aqueous solution have been investigated experimentally. N-octanol was used as a surfactant. The Marangoni convection occurred at/beneath the solution surface in the very beginning of steam absorption was observed both by a real-time type laser holographic visualization and by temperature measurements with extremely fine gauge thermocouples. Generation and growth of the Marangoni convection were both observed and evaluated quantitatively by the flow visualization. Furthermore, solution's surface temperatures with and without addition of the surfactant were measured minutely. Cell's formation pattern and migration speed at the surface were measured varying the initial surfactant's concentration ranging from 0 to 50000 ppm and the shallow liquid layer thickness ranging from 2 to 5 mm. And spacio-temporal scales of the Marangoni convection were determined. Also solution temperature changes at the surface were compared. Temperature increases when the surfactant was added to its solubility limit became almost double than that case of no surfactant. From these temperature differences, effects of the surfactant on absorber's performances were estimated by a calculation quantitatively with diffusion coefficient as an evaluation value.

DOI： 10.11322/tjsrae.19.223

CiNii Article

Publishing type：Research paper (international conference proceedings)   Kind of work：Joint Work   International / domestic magazine：International journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

This research was conducted in order to better identify the torque loss of a hermetic rotary compressor for one revolution, and to directly obtain the actual shaft power of the compressor. A testing compressor and a gas cycle type simplified calorimeter were developed for direct measurement of the compressor torque. <br> A strain gauge was stuck on the shaft between a compressor and a motor. Thus, the compressor torque could be measured directly by the strain gauge and data were transmitted to out of the compressor's vessel through a slip ring. Rotational speed of the compressor was measured by using a gap sensor also. From these measurement results, actual shaft power was calculated experimentally. <br>On the other hand, effective compressive torque for compressing refrigerant gas was predicted theoretically. From both experimental and theoretical results, torque loss of the compressor was determined as the difference of the compressor torque from the effective compressive torque. Consequently, a loss of over-compression could be revealed from the torque loss experimentally. Furthermore, overall adiabatic efficiencies of compressors obtained by the actual shaft power were 1.1&sim;3.5% higher than former overall adiabatic efficiencies obtained by the motor output.

DOI： 10.11322/tjsrae.18.39

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

Publishing type：Research paper (international conference proceedings)   Kind of work：Joint Work   International / domestic magazine：International journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Absorption refrigerators available today are designed and commercialized on the basis of empirical technology. So the absorption phenomenon and heat transfer process in a conventional absorber of horizontal smooth tubes type have not been clarified yet. In the present study, a prototype experimental absorber which enables us to observe a falling film of aqueous lithium bromide on the tubes in its optically was manufactured. The absorber consists of 13 horizontal smooth tubes. And absorption experiments were carried out with a use of n-octanol as a surfactant ranging from 0 to 500ppm. Behaviors of a solution flow both on the horizontal tubes and in the space among them were observed by using a high speed video camera. Moreover, temperature distributions of the falling film of aqueous lithium bromide, cooling water and heat transfer tubes' surfaces were measured minutely. The ratios of wettability of tubes' surface were estimated, and heat transfer values on the absorber were evaluated. The refrigerating capacity increases to double with increasing surfactant concentration until its solubility limit .And it was revealed that the enhancement of refrigerating capacity with addition of the surfactant is mainly caused by a spread of wet surface of tubes.

DOI： 10.11322/tjsrae.17.223

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (international conference proceedings)   Kind of work：Joint Work   International / domestic magazine：International journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Authorship：Lead author   Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Local heat transfer characteristics of high temperature impinging two-dimensional air jets were investigated by using a novel multi-pulsed laser holographic interferometry. Thermal flow fields at nozzle-to-plate space were visualized real-time for various jet velocities and nozzle-to-plate distances, which were recorded by using a high-speed streak camera(5000fps). Instantaneous development and growth of streamwise vortices were clearly visualized by this novel method. The results indicate that the local heat transfer coefficients are greatly affected by the large-scale vortices which appear in the wall jet region. Furthermore, it could be demonstrated that this multi-pulsed laser holographic technique is effectively applicable to the high-speed observation of the impinging jets.

DOI： 10.3154/jvs.18.Supplement1_225

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Surface tension induced (Marangoni-Benard) convection occurs at a surface of lithium bromide (LiBr) aqueous solution with addition of a small amount of surfactant was observed in order to investigate a mechanism of absorption enhancement by surfactant. Real time type laser holographic interferometry was used to visualize the transient phenomena occurred at/beneath the LiBr aqueous solution's surface in the very beginning(0-20msec) of steam absorption under vacuum condition(0.7kPa). Experiments were performed varying the initial surfactant concentration from 0 to 200ppm and the liquid layer thickness of 3-5mm. Pentagonal or hexagonal cell's patterns were observed at the surface clearly. And those cells evolved from small to large size instantly. Thereafter large scale chaotic eddies were induced at the surface.

DOI： 10.3154/jvs.18.Supplement1_29

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work  

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (other)   Kind of work：Single Work   International / domestic magazine：Domestic journal  

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (other)   Kind of work：Single Work   International / domestic magazine：Domestic journal  

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Kind of work：Single Work   International / domestic magazine：Domestic journal  

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (other)   Kind of work：Single Work   International / domestic magazine：Domestic journal  

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

CiNii Article

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (other)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Kind of work：Single Work   International / domestic magazine：Domestic journal  

DOI： 10.11402/cookeryscience.50.S50

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (other)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

J-GLOBAL

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

J-GLOBAL

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

CiNii Article

Other URL： http://id.nii.ac.jp/1141/00054264/

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

CiNii Article

Other URL： http://id.nii.ac.jp/1141/00054254/

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

J-GLOBAL

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (other)   Kind of work：Single Work   International / domestic magazine：Domestic journal  

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

J-GLOBAL

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

CiNii Article

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

J-GLOBAL

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

Recently, the superheated steam is widely used in the various fields, for example, drying, sterilization and cooking. In the use of superheated steam, humidity in the processing device is one of the important parameter affecting product quality. So we need the humidity sensor whitch is economic and used at high temperature. To measure humidity at high temperature, it is necessary to control the water retention level of the wick. In this paper, we showed the principle of the moisture sensor and the structure of the humidity sensor. The result shows that it is possible to detect the water retention level by the partial moisturel sensor, and to control water retention level by the moisture sensor.

CiNii Article

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

CiNii Article

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Kind of work：Single Work   International / domestic magazine：Domestic journal  

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Kind of work：Single Work   International / domestic magazine：Domestic journal  

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (other)   Kind of work：Single Work   International / domestic magazine：Domestic journal  

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Kind of work：Single Work   International / domestic magazine：Domestic journal  

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (other)   Kind of work：Single Work   International / domestic magazine：Domestic journal  

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

CiNii Article

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

J-GLOBAL

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

We applied the theory of a psychrometer to develop a humidity monitoring system by using porous ceramics as a sensing element. The effects of porosities and pore size distributions on water transfer were investigated theoretically and experimentally. Several types of cylindrical porous ceramics were used. In addition, we compared the moisture transfer coefficients / permeability coefficients. The results showed that capillary water transfer were higher in the conditions that porosity was laeger and pore size distribution was wider. The water transfer by pressure difference were higher in the conditions that mode diameter was laeger.

CiNii Article

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

CiNii Article

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Kind of work：Single Work   International / domestic magazine：Domestic journal  

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

J-GLOBAL

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

J-GLOBAL

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

J-GLOBAL

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

CiNii Article

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

J-GLOBAL

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

J-GLOBAL

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

J-GLOBAL

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Kind of work：Single Work   International / domestic magazine：Domestic journal  

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

J-GLOBAL

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Kind of work：Single Work   International / domestic magazine：Domestic journal  

CiNii Article

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Kind of work：Single Work   International / domestic magazine：Domestic journal  

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

CiNii Article

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Kind of work：Single Work   International / domestic magazine：Domestic journal  

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Kind of work：Single Work   International / domestic magazine：Domestic journal  

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (other)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (other)   Kind of work：Single Work   International / domestic magazine：Domestic journal  

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Authorship：Lead author   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Kind of work：Single Work   International / domestic magazine：Domestic journal  

Presentation type：Oral presentation (general)  

Venue：大阪  

Presentation type：Oral presentation (general)  

Venue：大阪  

Presentation type：Poster presentation  

Venue：大阪  

Presentation type：Poster presentation  

Venue：大阪  

Presentation type：Poster presentation  

Venue：大阪  

Presentation type：Poster presentation  

Venue：大阪  

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Venue：大阪  

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Venue：Kumamoto  

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Venue：大阪  

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Venue：大阪  

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Venue：大阪  

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Venue：大阪  

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Venue：大阪  

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Venue：Portugal  

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Venue：Italy Napoli  

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Venue：大阪  

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Venue：kobe  

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Presentation type：Poster presentation  

Presentation type：Poster presentation  

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Presentation type：Oral presentation (general)  

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Presentation type：Oral presentation (general)  

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Presentation type：Oral presentation (general)  

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Presentation type：Oral presentation (general)  

Presentation type：Oral presentation (general)  

Presentation type：Oral presentation (general)  

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Venue：香川  

Presentation type：Poster presentation  

Presentation type：Poster presentation  

Presentation type：Poster presentation  

Presentation type：Oral presentation (general)  

Presentation type：Oral presentation (general)  

Presentation type：Oral presentation (general)  

DOI： 10.15048/jcsaj.43.3__9

CiNii Article

Presentation type：Oral presentation (general)  

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Presentation type：Poster presentation  

Presentation type：Oral presentation (general)  

DOI： 10.15048/jcsaj.41.3__10

CiNii Article

Presentation type：Oral presentation (general)  

Presentation type：Oral presentation (general)  

DOI： 10.15048/jcsaj.41.3__12

CiNii Article

Presentation type：Oral presentation (invited, special)  

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Presentation type：Oral presentation (general)  

Presentation type：Oral presentation (invited, special)  

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CiNii Article

Presentation type：Oral presentation (general)  

Presentation type：Oral presentation (general)  

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CiNii Article

Presentation type：Oral presentation (general)  

CiNii Article

Presentation type：Poster presentation  

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Presentation type：Poster presentation  

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DOI： 10.11279/jfeskouen.166_23

CiNii Article

Presentation type：Oral presentation (general)  

Presentation type：Oral presentation (general)  

Presentation type：Oral presentation (general)  

Presentation type：Oral presentation (invited, special)  

Presentation type：Oral presentation (general)  

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DOI： 10.11402/ajscs.26.0_120

CiNii Article

Presentation type：Oral presentation (general)  

DOI： 10.11402/ajscs.26.0_121

CiNii Article

Presentation type：Oral presentation (general)  

Presentation type：Oral presentation (general)  

Presentation type：Oral presentation (invited, special)  

Recently, the superheated steam is widely used in the various fields, for example, drying, sterilization and cooking. In the use of superheated steam, humidity in the processing device is one of the important parameters affecting the product quality. Therefore, a new humidity sensor which can be used at high temperature is required to be developed. There is also a demand to monitor the distribution of humidity inside the processing device. So we develop a system that can monitor humidity measured in remote places at high temperature in real time. In this paper, we show structure of the system. It is confirmed that our system can measure humidity at high temperature and can monitor humidity data in real time.

CiNii Article

Presentation type：Oral presentation (general)  

Presentation type：Oral presentation (general)  

Presentation type：Oral presentation (general)  

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CiNii Article

Presentation type：Oral presentation (general)  

CiNii Article

Presentation type：Oral presentation (general)  

Recently, the superheated steam is widely used in the various fields, for example, drying, sterilization and cooking. In the use of superheated steam, humidity in the processing device is one of the important parameter affecting product quality. So we need the humidity sensor whitch is economic and used at high temperature. To measure humidity at high temperature, it is necessary to control the water retention level of the wick. In this paper, we showed the principle of the moisture sensor and the structure of the humidity sensor. The result shows that it is possible to detect the water retention level by the partial moisturel sensor, and to control water retention level by the moisture sensor.

CiNii Article

Presentation type：Oral presentation (general)  

Presentation type：Oral presentation (invited, special)  

Presentation type：Oral presentation (general)  

Presentation type：Oral presentation (invited, special)  

Presentation type：Oral presentation (general)  

Recently, the use of superheated steam is expanding in the field of sterilization, drying, heating and cooking. In the use of superheated steam, humidity in the processing device is an important parameter affecting the product quality. And the needs of being able to monitor remotely in real time has increased. In this paper, we propose a remote measurement system using a wireless network, and showed its outline. We did experiment using 920MHz band and 2.4GHz band in actual environment for elucidating the propagation characteristics, if the data is send to outside from the steam convection oven's inside. The result shows that the both frequency bands can communicate without problems because electromagnetic wave leak to the outside through peep window.

CiNii Article

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CiNii Article

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DOI： 10.11279/jfeskouen.164_75

CiNii Article

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CiNii Article

Presentation type：Oral presentation (general)  

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Nowadays, the temperature and humidity control of superheated steam have become important research area in food drier, pasteurization and food processing. The authors have studied on economic humidity sensor that it is available even at high temperature of more than 200 degrees. The humidity sensor works based on relationship between dry-bulb and wet-bulb temperatures. To measure accurate wet-bulb temperature, water retention control is necessary for keeping temperature near the thermocouple for wet-bulb uniform inside wet material. The sensor's structure should be also well-considered so as to be suitable for water supply functionality. In this paper, porous ceramic is newly developed and used as wet material of the humidity sensor because of high durability against high temperature environment. For automatic water retention control, a prototype of the sensor has a water level sensor inside ceramic and a moisture sensor on the surface of the ceramic. The microcontroller operates a pinch valve to control the amount of water from a tank based on the sensor's outputs. We propose its control algorithm and confirm its validity by transfer function analysis. Moreover, the prototype of the sensor is implemented on the food processing machine and an experimental evaluation of the water retention control is made. We also confirm that the moisture sensor on the surface of the ceramic is effective for detecting reliability of the wet-bulb temperature measurements, by additional experiments.

CiNii Article

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CiNii Article

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CiNii Article

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CiNii Article

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A new molding method using high humidity hot air as heating media was developed. We constructed a laboratory-scale apparatus for concluding basic experimental studies. Packed beds of silica sand coated with/without phenol resins or sugars as an adhesive agent were used as the material. During the initial stage of heating with high humidity air, the temperature of the packed bed uniformly rises rapidly by steam condensation. Results of molding tests indicated that the relationship between the wall temperature of the heating section and the dew-point temperature of the heating media, for regulating the condensation in the packed bed, should be optimized to improve the quality of products and to reduce the heating time.

CiNii Article

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The authors have been investigating about thermal utilization of the biomass resources in the city from the viewpoint of prevention of global warming. In this report, we examined high efficiency of the waste generation theoretically among a waste incineration plant and the sewage treatment plant where a waste biomass was concentrated. Specifically, we examined about two improvement methods. One way was a heating of the steam by means of a digestion gas which is generated through the sewerage treatment process. The other way is an introduction of binary cycle power generation by means of a working medium that has a low boiling temperature. As a result, it was revealed that the efficiency of incineration power generation is improved 8 percent at the maximum.

CiNii Article

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