Dynamics of a droplet in shear flow by smoothed particle hydrodynamics

Frontiers in Physics

Physics

Hong Liang¹  Chong Zhao²  Xin Bian³  Kuiliang Wang³ 

[1] Department of Physics, Hangzhou Dianzi University, Hangzhou, China;Hangzhou Shiguangji Intelligient Electronics Technology Co., Ltd., Hangzhou, China;State Key Laboratory of Fluid Power and Mechatronic Systems, Department of Engineering Mechanics, Zhejiang University, Hanghzhou, China;

关键词: droplet;    multiphase flow;    surface tension;    shear;    SPH;   

DOI  :  10.3389/fphy.2023.1286217

 received in 2023-08-31, accepted in 2023-09-29,  发布年份 2023

来源: Frontiers

【 摘 要 】

The behavior of a droplet under shear flow in a confined channel is studied numerically using a multi-phase smoothed particle hydrodynamics (SPH) method. With an extensive range of Reynolds number, capillary number, wall confinement, and density/viscosity ratio between the droplet and the matrix fluid, we are able to investigate systematically the droplet dynamics such as deformation and breakup. We conduct the majority of the simulations in two dimensions due to economical computations, while perform a few representative simulations in three dimensions to corroborate the former. Comparison between current results and those in literature indicates that the SPH method adopted has an excellent accuracy and is capable of simulating scenarios with large density or/and viscosity ratios. We generate slices of phase diagram in five dimensions, scopes of which are unprecedented. Based on the phase diagram, critical capillary numbers can be identified on the boundary of different states. As a realistic application, we perform simulations with actual parameters of water droplet in air flow to predict the critical conditions of breakup, which is crucial in the context of atomization.

【 授权许可】

Unknown   
Copyright © 2023 Wang, Liang, Zhao and Bian.