Study on dynamic particle accumulation structure in thermocapillary convection for liquid-solid two-phase flow

被引：0
|
作者：
Huang X. [1 ]
Liang R. [1 ,2 ]
Fan J. [1 ]
机构：
[1] Key Laboratory of National Education Ministry for Electromagnetic Processes of Materials, Shenyang
[2] School of Mechanical and Vehicle Engineering, Linyi University, Linyi
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2021年 / 52卷 / 04期
基金：
中国国家自然科学基金;
关键词：
CFD-DEM; Oscillatory characteristics; Particle dynamic accumulation structure; Power spectral density; Thermocapillary convection;
D O I：
10.11817/j.issn.1672-7207.2021.04.021
中图分类号：
学科分类号：
摘要：
The effects of aspect ratio on the thermocapillary convection and the particle dynamic accumulation structure(PAS) inside the liquid bridge were studied by using the coupled computational fluid dynamics and discrete element method(CFD-DEM). The results show that when the temperature field of the horizontal cross section z=0 rotates once, the temperature of the fixed points changes periodically m times. As the aspect ratio increases, the azimuthal wave number decreases, and the number of cold regions in horizontal cross section z=0 decreases. Along the free surface of the liquid bridge, the velocity of fluid increases first and then decreases from top to bottom, and the velocity oscillation strengthens from top to bottom. The PAS is also observed in simulations based on three-way coupling. There is a region with fewer particles in the center of the top view of a liquid bridge. All particles move together in an approximate pattern, which explains why the PAS rotates at the same angular velocity as the thermocapillary convection. © 2021, Central South University Press. All right reserved.
引用
收藏
页码：1251 / 1260
页数：9
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