摘要
两相流动不稳定性是在各种水力学直径通道内所遇到的复杂现象，这些不稳定性对热能系统可能造成有害影响。本文以丙酮为工质，在微通道入口处设置微汽泡发生器，采用脉冲电压激励产生可控微汽泡，以微汽泡为种子尝试对通道内沸腾不稳定性的控制。实验研究表明，低频种子汽泡热控能够减轻各参数的脉动幅度；高频种子汽泡热控能彻底抑制沸腾不稳定性。本研究结果为解决微通道内沸腾不稳定性提供了一种崭新有效的手段。
Two phase flow instability is a sophisticated phenomenon in all kinds of channels, which could bring damage to the thermal system. Acetone used as working fluid, microheater array was integrated at the entrance of microchannels, driven by the pulse voltage signal to generate controllable bubbles, the bubble is used as nucleation seed to control flow boiling instability in microchannel. The results indicate that low frequency seed bubbles decrease oscillation amplitudes of various parameters. High frequency seed bubbles completely suppress the flow instability. The result of present study provides a novel method to solve the boiling instability embarrassment in heated microchannels.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2010年第6期975-978,共4页
Journal of Engineering Thermophysics
基金
国家杰出青年基金项目(No.50825603)
关键词
种子汽泡
微通道
强化换热
沸腾不稳定性
seed bubble
microchannel
heat transfer enhancement
boiling instability
