液滴在固体平表面上均匀蒸发过程的格子Boltzmann模拟  

Lattice Boltzmann Simulation of Droplet Evaporation on Flat Solid Surface

作　　者：谢驰宇 张建影[2] 王沫然[1] 

机构地区：[1]清华大学工程力学系,北京100084 [2]北京大学工学院,北京100871

出　　处：《应用数学和力学》2014年第3期247-253,共7页Applied Mathematics and Mechanics

基　　金：国家自然科学基金(51176089);国家重点基础研究发展计划(973计划)(2013CB228301)~~

摘　　要：通过格子玻尔兹曼(lattice Boltzmann method,LBM)数值模拟,研究了液滴在固体平表面上蒸发过程形状变化的机理.揭示了不同静态接触角下液滴蒸发过程中重力对其形状变化的影响规律.结果表明,重力的影响随着液滴尺度的减小而减弱,达到某一临界点后,重力对蒸发过程的影响可以忽略.模拟定量确定了液滴尺寸的这一临界值,并分析了蒸发过程中几个典型时刻液滴内部的流场分布,进一步研究了重力的影响.Mechanisms of droplet evaporation on flat solid surface were investigated with the Lattice Boltzmann method. Effect of gravity on the droplet shape change during evaporation in the cases of different static contact angles was detailedly analyzed. The results show that, as the droplet size decreases, the gravity effect decreases; and when the size reaches a critical val- ue, the gravity effect grows negligible. This critical value for a water droplet was calculated for specific parameters, which was 50% lower than the value given by the classical capillary theory. Moreover, the inside-droplet flow patterns are also considerably influenced by gravity and the droplet size.

关 键 词：格子BOLTZMANN方法 液滴蒸发 重力影响 多相流 

分 类 号：O359.1[理学—流体力学]