两种电极作用下微细通道内的R141b流动沸腾传热  

Effect of Two Electrodes on Flow Boiling Heat Transfer of R141b in Microchannels

作　　者：罗小平[1] 张超勇 喻葭 郭峰[1] LUO Xiaoping;ZHANG Chaoyong;YU Jia;GUO Feng(School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China)

机构地区：[1]华南理工大学机械与汽车工程学院

出　　处：《华南理工大学学报（自然科学版）》2019年第9期1-8,共8页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(21776096)~~

摘　　要：为研究电场作用下微细通道内流动沸腾传热特性,设计了两种电极布置方式将电场引入到微细通道中,选取制冷剂R141b作为工质,在设计系统压力140 kPa,工质入口温度305.65 K工况下,研究了电场对微细通道内制冷剂R141b流动沸腾传热的影响.结果表明:电场能够强化微细通道传热,针状电极作用下沸腾曲线明显左移,与针状电极不同,线状电极除0、250 V沸腾曲线基本重合外,其余沸腾曲线均明显左移,说明线状电极起强化作用的有效电压高于针状电极;饱和沸腾传热系数随热流密度的增大先增大后减小,随质量流密度的增大而增大,相对于无电场,在250、550、850 V的3种针状电极作用下饱和沸腾传热系数分别提高了39%、62%、77%,线状电极作用下提高了0%,50%,82%;低电压时,针状电极的强化传热因子大于线状电极的强化传热因子,高电压时则相反,在本实验工况下,针状电极下的强化传热因子最大为1.77,线状电极下的强化传热因子最大为1.82.Two different electrode arrangements were designed to introduce the electric field into microchannels to investigate the flow boiling heat transfer characteristics of microchannels under the effect of electric field. Refrige-rant R141b was taken as the working fluid to research the influence of electric field on the flow boiling heat transfer in microchannels with designed capacity of system pressure at 140 kPa and inlet temperature at 305.65 K. The experi-mental results indicate that the electric field can enhance heat transfer of microchannels and the boiling curve of needle electrode is obviously shifted to the left. Unlike needle electrode, the boiling curve of wire electrode overlaps with the 0 V and 250 V and the other boiling curves are obviously shifted to the left, which manifests that the effective voltage of wire electrode for strengthening is higher than that of the needle electrode. The saturated boiling heat transfer coefficient of two electrode arrangements increases first and then decreases with the increase of heat flux, and increases with the increase of mass flow rate. Compared to the electrical field-free, the saturated boiling heat transfer coefficient was increased by 39%, 62%, 77% respectively under three kinds of needle electrode of 250, 550, 850 V, and by 0%, 50%, 82% respectively under three kinds of wire electrode. At low voltage, the enhanced heat transfer factor of needle electrode is greater than that of the wire electrode, and the opposite is true for high voltage. Under the experimental condition, the maximum heat transfer enhancement factor of needle electrode is 1.77, and that of the wire electrode is 1.82.

关 键 词：微细通道 电场 强化传热 流动沸腾 针状电极 线状电极 

分 类 号：TK124[动力工程及工程热物理—工程热物理]