A New Approach Toward Low-Temperature Thermal Engineering Without Fluorocarbon Refrigerants

1. 微通道内两相流的传热和流动特性（作者：k.h hijikata）：通过对微通道内两相流的实验研究来确定流动和传热特性。由25个平行微通道组成的阵列，高度尺寸为209微米。每一个的宽度为212毫米，长度为9.96毫米，是在不锈钢板上制造的。结果表明，微通道中两相流的摩擦因数小于常规尺寸通道，两相的努塞尔数达到纯液体的两倍。2. 吸收式制冷机的高性能传热（作者：H.Inaba）：对填充在圆柱形吸收层中的高性能有机纤维吸附剂在不同密度下的吸附/解吸特性进行了实验研究。结果表明，本研究所制备的吸附剂的吸附/脱附性能明显优于常规无机纤维吸附剂。3. 利用多组分介质增强和控制传热（作者：a . takimoto）：对膜/液滴组合冷凝的微观尺度特性和冷凝传热特性进行了分析和实验研究。试验采用无机制冷剂和有机材料的混合物作为二元非混溶液。该分析模型的预测结果与实验结果吻合较好。4. 新制冷剂热物理特性的测量。（作者：Y.Nagasaka）：用瞬态热线法测量了HFC-32和HFC-125混合物在213K-293K温度范围和2- 30mpa压力范围内，HFC-32质量分数为0.249,0.5,0.75时的液体导热系数，精度为0.5%。测定了HFC-32和hfc - 125的固体导热系数。5. 利用电场控制霜冻生长。为了促进结霜和控制结霜生长，实验研究了电场对结霜现象的影响。阐明了电压、脉冲宽度和频率对除霜的影响，讨论了除霜机理和表面润湿性的影响。6. 结霜除霜换热器的特性（作者：青木k）：研究了结霜除霜循环换热器的传热特性和性能。此外，实验还阐明了超高接触角表面对结霜生长的影响。7. 淤泥层融化与流动特性的实验研究（S.Fukusako）： a experiment Less

1. Heat transfer and flow characteristics of two-phase flow in the microchannels (by K.Hijikata) : An experimental study on two-phase flow in microchannels has been conducted to identify the characteristics of flow and heat transfer. An array of 25 parallel michrochannels with the dimensions of 209 mum in height. 212 mum in width, and 9.96 mm in length for each one was manufactured on the stainless steel plate. The results showed that the friction factor for two-phase flow in the microchannels was smaller than that in conventional sized channels, and that the Nusselt number in the two-phase reached twice as large as that for liquid only. 2. High performance heat transfer in the absorption type refrigerator (by H.Inaba) : An experimental investigation on the adsorption/desorption characteristics of high performance organic fibrous absorbent, which was filled in the cylindrical absorption layr under a variety of densities, has been carried out. The results showed that the adsorption/deso … More rption characteristics of the absorbent in the present study is much better than that of conventional inorganic fibrous absorbent quantitatively. 3. Enhancement and Control of Heat Transfer by using a Multicomponent Medium (by A.Takimoto) : An analytical and experimental investigation on the micro-scale characteristics and the condensation heat transfer characteristics in the filmwise/droplet combined condensation has been carried out. A mixture of inorganic refrigerant and organic materials was adopted as the binary immiscibel liquid under the test. The predictions obtained in the present analytical model agree well with the experimental results. 4. Measurement of the Thermophysical Properties of the New Refrigerants. (by Y.Nagasaka) : The Liquid thermal cnductivity of the mixtures of HFC-32 and HFC-125 has been measured in the trmperature range 213K-293K and in the pressure range 2-30 Mpa with the HFC-32 mass fractions of 0.249,0.5,0.75 by using the transient hot-wire method with the precision of 0.5%. The solid thermal conductivity of HFC-32 and HFC125 has been also measured. 5. Control against the Growth of Frost by Utilizing the Electric Fields. (by M.Kumada) : In order to promote the defrosting and to control sagainst the frost growth, the effect of electric field on frosting phenomenon has been investigated experimentally. The effect of voltage, width of the pulse, and frequency on the defrosting was clarified, furthermore, the defrosting mechanism and the effect of the wettability of the surface was discussed. 6. Characteristics of Heat Exchanger Operating with Frosting and Defrosting (by K.Aoki) : The heat transfer characteristics and the performance of the heat exchanger with frosting/defrosting cycle have been investigated. Furthermore, the effect of the surface with ultra-high contact angle on the growth of the frost has been clarified experimentally. 7. Experimental study on the melting and flow characteristics of slush layr (by S.Fukusako) : An experim Less