微通道人工空穴汽泡核化跃离的lattice Boltzmann模拟  

NUMERICAL INVESTIGATION OF BUBBLE NUCLEATION DEPARTURE IN MICROCHANNEL REENTRANT CAVITY BASED ON LATTICE BOLTZMANN METHOD

作　　者：董志强[1] 徐进良[2] 

机构地区：[1]中国科学院广州能源研究所微能源系统实验室,广州510640 [2]华北电力大学新能源与可再生能源北京市重点实验室,北京102206

出　　处：《工程力学》2012年第5期219-223,共5页Engineering Mechanics

基　　金：国家杰出青年科学基金项目(50825603);国家青年科学基金项目(51106162)

摘　　要：研究微纳尺度的汽泡动力学行为是微纳流动与传热的基础前沿。基于作者提出的能描述相变之热质传递的lattice Boltzmann大密度比多相流复合模型,该文数值研究了单微通道中汽泡在人工空穴上核化跃离的物理过程,量化分析了汽泡核化、跃离和运动对微通道内液相流动和传热的影响,可为理论探索人工空穴强化微通道传热提供有意义的参考。The vapor bubble nucleation effects on heat-transfer and fluid flows in microchannel are investigated based on an improved hybrid lattice Boltzmann model.The dynamic process of bubble growth,departure and motion are simulated in microchannel with different physical conditions,while the process influences on fluid flow and heat transfer are also quantitatively predicted respectively.The results show that the bubble nucleation on reentrant cavity can induce the periodic flow instability;through it also strengthens the efficiency in heat transfer around the bubble.

关 键 词：lattice BOLTZMANN方法 微通道 汽泡 核化 传质传热 

分 类 号：O35[理学—流体力学]