微纳米结构分级强化开放型微通道流动沸腾实验研究  

Multi-stage Enhancement on Flow Boiling in Open Microchannels With Micro/nano Structures

作　　者：银了飞 张坷昕 杨钟琳 秦天均 马骁婧 YIN Liaofei;ZHANG Kexin;YANG Zhonglin;QIN Tianjun;MA Xiaojing(Institute of Thermal Engineering,School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University,Beijing 100044,China;Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education,North China Electric Power University,Beijing 102206,China)

机构地区：[1]北京交通大学机械与电子控制工程学院热能工程研究所,北京100044 [2]电站能量传递转化与系统教育部重点实验室(华北电力大学),北京102206

出　　处：《工程热物理学报》2025年第4期1278-1287,共10页Journal of Engineering Thermophysics

基　　金：国家自然科学基金面上项目(No.52276047);国家自然科学基金“联合基金”重点支持项目(No.U2141219)。

摘　　要：开放型微通道具有促进气液分离、稳定两相流动并提升流动沸腾换热性能的优点,然而随着电子器件热管理要求的不断提高,进一步提升开放型微通道流动沸腾换热能力成为研究热点。本文以低表面张力流体SF-33为实验工质,对比研究了光滑表面开放型微通道(SSOMC)与分级强化结构开放型微通道(MEOMC)中的流动沸腾特性,利用高速相机观察两个开放型微通道中的气泡行为及流型转换差异,并分析分级强化结构影响流动沸腾换热机理。结果表明,在高热流密度下SSOMC中出现段塞-分层流,而在MEOMC中观察到一种命名为段塞-爆破弥散流的新流型。分级强化结构能够显著提升开放型微通道的流动沸腾换热性能,并且在过冷流动沸腾时提升换热性能效果更佳明显。另一方面,由于分级强化结构较强的毛细芯吸能力,导致MEOMC中的两相压降始终低于SSOMC。Open microchannels have advantages such as promoting vapor-liquid separation,stabiliz-ing two-phase flow,and improving heat transfer performance.However,with the increasing demands for thermal management of electronic devices,enhancing the flow boiling heat transfer capacity of open microchannels has become a research focus.In this study,low-surface-tension fluid SF-33 is used as the working fluid to experimentally compare the flow boiling characteristics in smooth surface open microchannels(SSOMC)and multi-stage enhanced open microchannels(MEOMC).High-speed visualization is employed to observe bubble behavior and flow regime transitions in both types of microchannels,analyzing the effect of micro/nano structures on flow boiling heat transfer mecha-nisms.The results show that under high heat flux,a plug-stratified flow is observed in SSOMC,while a new flow regime,termed plug-dispersed flow,is observed in MEOMC.The multi-stage enhanced structures significantly improve the flow boiling heat transfer performance of open microchannels,with a more pronounced improvement during subcooled flow boiling.Additionally,due to the strong capillary wicking effect of the micro/nano structures,the two-phase pressure drop in MEOMC is consistently lower than that in SSOMC.

关 键 词：开放型微通道 分级强化 流动沸腾 流型 传热 

分 类 号：TK123[动力工程及工程热物理—工程热物理]