用格子Boltzmann方法模拟液滴合并过程  

Simulation of droplets coalescence process by Lattice Boltzmann method

作　　者：李维仲[1] 李爽[1] 

机构地区：[1]大连理工大学能源与动力学院,辽宁大连116024

出　　处：《热科学与技术》2007年第3期198-203,共6页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(50476074)

摘　　要：用格子Boltzmann方法中的伪势模型对两个液滴的合并过程进行了数值模拟。详细研究了两液滴能否合并临界尺寸和液滴合并过程中液桥的形成与演化的关系,并研究了表面张力对合并速度的影响。研究结果发现当两个液滴之间距离小于2倍界面厚度时,两个液滴在不受外力的作用下能够自动合并;液桥的宽度与演化时间有一定的指数关系;表面张力越大,合并速度越快,这个结果与前人的理论预测和实验结果一致。The lattice Boltzmann potential model was used to simulate the droplets coalescence process. It was found that if the gap width between two static droplets was less than twice of interface width, these two droplets would merge together. During the coalescence process there will form a liquid bridge due to the surface tension, and the width of the bridge has a power-law dependence on time. The surface tension force affects the coalescence speed. The bigger the surface tension, the higher the coalescence speed. These results are in consistency with Eggers et al.＇s prediction and the experimental results.

关 键 词：格子BOLTZMANN方法 伪势模型 两相流 液滴合并 

分 类 号：O359[理学—流体力学]