高校化学工程学报2023，Vol.37Issue(6)：906-916,11.DOI:10.3969/j.issn.1003-9015.2023.06.005
电场和声场作用下微细通道流动沸腾气泡特性与传热性能
Bubble characteristics and heat transfer performance of flow boiling in microchannels under electric and ultrasound fields
摘要
Abstract
In order to study the effects of electric and ultrasound fields on bubble characteristics and heat transfer performance of flow boiling in microchannels,heat transfer experiments of refrigerant R141b under different fields were studied.Quantitative research on bubble characteristics was carried out through topological analysis of high-speed photography,where the first Betti number β1 indicates the number of bubbles and the zeroth Betti number β0 indicates the number of confined bubbles.The results show that 400,600,800 V electric fields increase β1 by 23.3%,36.3%,43.1%and decrease β0 by 13.6%,19.6%,23.2%,respectively,which indicates that electric fields significantly increase the number of bubbles and decrease the number of confined bubbles.The heat transfer enhancement ratio reaches its peak at 1.56 under 800V electric field.Moreover,ultrasound fields(23,40 kHz in frequency and 12.5,50 W in power)increase β1 by the range of 22.7%to 55.6%and decrease β0 by the range of 12.8%to 25.8%,respectively,which indicates that ultrasound field also increases the number of bubbles and decrease the number of confined bubbles.The enhancement ratio reaches its peak at 1.79 under 23 kHz,50 W ultrasound field.Furthermore,the improvement of bubble characteristics and heat transfer performance were more obvious when two types of fields were collaboratively applied,in which case β1 increases by 76.2%and β0 decrease by 35.7%,and the enhancement ratio reaches 2.06.关键词
微细通道/沸腾传热/电场/超声场Key words
microchannels/boiling heat transfer/electric field/ultrasound field分类
能源科技引用本文复制引用
罗小平,范一杰,周建阳,张超勇..电场和声场作用下微细通道流动沸腾气泡特性与传热性能[J].高校化学工程学报,2023,37(6):906-916,11.基金项目
国家自然科学基金(22178118) （22178118）
广东省自然科学基金(2019A1515011053). （2019A1515011053）
