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微细通道内非共沸工质流动沸腾换热实验研究

Experimental Investigation on Flow Boiling Heat Transfer Characteristics of Zeotropic Mixture in Microchannels
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摘要 本文实验研究了非共沸混合制冷剂R134a/R245fa(质量比为0.7/0.3)在长度为45 mm、65 mm的平行微通道内的流动沸腾特性。微通道由30个截面为0.5 mm×0.5 mm矩形微通道组成。得到了质量流速在542.22-995.56kg·m^-2·s^-1、热流密度在4.9-100.2 W·cm^-2时的流动沸腾传热系数,并对R134a/R245fa和R134a的换热系数进行对比,结果表明热流密度、质量流速、通道长度对换热系数均有影响。考虑R134a/R245fa相变时的附加传质阻力对换热的影响下,在纯工质关联式中引入混合物影响因子,得到了适用于本实验工况下R134a/R245fa的关联式。 In the present study, the flow boiling heat transfer characteristics of zeotropic mixtures R134 a/R245 fa which in the length of micro-channels on the test sections were 45 mm and 65 mm, were experimentally investigated. Both of the test sections included 30 parallel rectangular microchannels with the cross-section of 0.5 mmx0.5 mm. The flow boiling heat transfer coefficients of working fluids were obtained under the experimental conditions, heat flux and mass flux ranging from 4.9-100.2 W·cm^-2 and 542.22-995.56 kg·m^-2·s^-1, respectively. The flow boiling heat transfer coefficients of R134 a/R245 fa as well as its pure component R134 a was experimentally investigated. It was found that the heat transfer coefficient was a strong function of heat flux, mass velocity and channel length.Taking account of the influence of additional mass transfer resistance of R134 a/R245 fa, the new correlation was developed with the introduction of mixture factor Cmix.
作者 杞卓玲 贾力 党超 QI Zhuo-Ling1,2 ,JIA Li1,2, DANG Chao1,2 (1Institute of Thermal Engineering, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China; 2. Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale, Beijing 100044, China)
出处 《工程热物理学报》 CSCD 北大核心 2018年第9期2005-2011,共7页 Journal of Engineering Thermophysics
基金 国家自然科学基金资助项目(No.51776015)
关键词 非共沸混合工质 流动沸腾 换热系数 换热关联式 zeotropic mixture flow boiling heat transfer coefficients heat transfer characteristics
作者简介 杞卓玲(1994-),女,博士研究生,主要从事传热传质研究。;通信作者,贾力,教授,ljia@bjtu.edu.cn
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