电场与声场作用下微细通道内R141b压降特性  

Pressure drop characteristics of R141b in microchannels under electric and ultrasonic fields

作　　者：罗小平[1] 许静姝 杨书斌 李景生 张超勇 LUO Xiao-ping;XU Jing-shu;YANG Shu-bin;LI Jing-sheng;ZHANG Chao-yong(School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510640

出　　处：《高校化学工程学报》2022年第5期647-655,共9页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(22178118);广东省自然科学基金(2019A1515011053)。

摘　　要：为研究电场与声场对微细通道压降和总体传热性能的影响,以制冷剂一氟二氯乙烷R141b为实验工质,对比并分析无外场、单独电场、单独声场、两场同时作用下的两相压降变化及影响。结合功率谱密度(PSD)和可视化,研究电场与声场作用下两相压降频域特性和气泡运动状态。采用Webb-Bergles方法研究不同外场作用下的微细通道强化传热综合性能。结果表明:在本实验工况下,电场电压越大、超声波频率越小、功率越大,两相压降越大;电场、声场的作用,能够加剧通道内气泡运动,降低气泡长径比;通过强化传热综合性能评价发现,电场和声场同时作用下强化传热综合性能最高,最高可达1.78。该研究结果可从多外场强化传热技术角度为微细通道换热提供新思路。In order to study the effects of electric and ultrasonic fields on pressure drop in microchannels and overall heat transfer performance of two-phase flow, refrigerant R141b was used as the experimental working medium to analyze the effects of two-phase pressure drop under different external fields. Power spectral density(PSD) and visualization methods were used to study frequency domain characteristics of pressure drop and bubble motion under external fields. The Webb-Bergles method was used to study comprehensive performance of heat transfer under different situations. The results show that under the experimental conditions, higher electric field voltage or lower ultrasonic frequency results in higher two-phase pressure drops. Electric and sound fields can improve bubble movement in the channels and reduce bubble aspect ratios. Performance evaluation criteria(PEC) indicates that the combination of electric and ultrasonic field has the highest heat transfer performance(up to 1.78). This study is helpful for microchannel heat transfer investigation using multi external fields enhanced heat transfer.

关 键 词：微细通道 超声波场 电场 压降 功率谱密度 可视化 强化传热综合性能评价 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]