膜态沸腾的汽化成核与界面演化研究  

Bubble Nucleation and Interface Evolution During Film Boiling

作　　者：陈婷[1] 陆丹鸿 康瑞鑫 刘国华 CHEN Ting;LU Danhong;KANG Ruixin;LIU Guohua(School of Optoelectronic Materials&Technology,Jianghan University,Wuhan 430056,Hubei,China;School of Energy Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]江汉大学光电材料与技术学院,湖北武汉430056 [2]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《江汉大学学报（自然科学版）》2023年第6期25-32,共8页Journal of Jianghan University：Natural Science Edition

基　　金：国家自然科学基金资助项目(52306086)。

摘　　要：与对流换热相比,沸腾传热通过相变汽化潜热带走更多热量,能显著提升换热能力。以CFD软件为技术手段,通过构建UDF函数以满足假定条件下膜态沸腾的气泡界面演化过程,采用VOF模型在微观层面对汽化成核与单气泡演化进行模拟研究。研究表明:气泡成核主要包含膨胀及拉伸两个阶段;气泡上升诱导形成的涡流增强了与周围的热质交换能力;液体表面张力及液体黏度增加会延长气泡脱离时间,且气泡直径增加。研究结果有助于深入理解膜态沸腾的换热机理,并可指导相关的相变传热工程应用。Compared with convective heat transfer,boiling heat transfer takes more heat away from the latent heat of gasification,which can significantly improve the heat transfer.In this paper,CFD software was used to construct the UDF function to trace the bubble interface evolution during film boiling,and the VOF model was used to simulate the bubble nucleation and single bubble evolution at the microscopic level.The results showed that bubble nucleation included the growth and extension stages.The rising bubble-induced vortex enhanced the heat and mass transfer with the surrounding media.The increase in surface tension and viscosity would extend the bubble separation time and increase the bubble diameter.This study has scientific significance for understanding the heat transfer mechanism of film boiling and is expected to guide the related engineering designs of heat transfer.

关 键 词：沸腾换热 VOF模型 传热传质 气泡演化 表面张力 

分 类 号：TK124[动力工程及工程热物理—工程热物理]