应用数学和力学2025，Vol.46Issue(10)：1256-1266,11.DOI:10.21656/1000-0887.450275
微通道中流体弹性对颗粒聚集的影响
The Influence Effect of Fluid Elasticity on Particle Aggregation in Microchannels
摘要
Abstract
The relative motion model was employed for numerical simulation of particle aggregation in viscoe-lastic fluids,with the Oldroyd-B model to describe the viscoelastic constitutive relationship and the log-confor-mation reformulation for stable numerical simulation.The effects of particle aggregation characteristics on vis-coelastic fluids with varying elasticities were examined.The findings show that,an increase in the Weissenberg number(Wi),coupled with a reduction in the βvalue of the viscoelastic fluid,could substantially enhance the fluid elasticity within the channel.Furthermore,significant fluctuations in the force experienced at the radial positions of the particles were observed.The distribution of radial forces on the particles fundamentally depends on the distribution of inertial forces,with elastic lifts fluctuations also causing inertial lift variations;thus,iner-tia and elasticity coexist nonlinearly.Higher Wi and lower β values enlarge the region where lift forces direct particles toward the pipe center,shifting aggregation from the wall toward the center.In addition,the strong e-lastic flow makes the force direction of the particles always point to the pipe center.关键词
黏弹性流体/颗粒聚集/Oldroyd-B模型/OpenFOAMKey words
viscoelastic fluid/particle aggregation/Oldroyd-B model/OpenFOAM分类
力学引用本文复制引用
赵可馨,王企鲲,柯灵杰..微通道中流体弹性对颗粒聚集的影响[J].应用数学和力学,2025,46(10):1256-1266,11.基金项目
国家自然科学基金(52576166) （52576166）
