剪切稀化流变特性对微通道中颗粒迁移的影响  

Effect of Shear Thinning Rheological Properties on Particle Migration in Microchannels

作　　者：沈洋 王企鲲[1] 刘唐京 SHEN Yang;WANG Qikun;LIU Tangjing(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,P.R.China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《应用数学和力学》2024年第5期637-650,共14页Applied Mathematics and Mechanics

摘　　要：该文采用“相对运动模型”对剪切稀化流体中的颗粒聚集现象进行了数值模拟,为了解剪切稀化效应在微流体中对颗粒力学特性的影响,对黏弹性流体和非黏弹性流体进行了剪切稀化的匹配.研究结果表明,剪切稀化特性可以明显改变颗粒的力学特性.在非黏弹性流体中,剪切稀化能导致颗粒的聚集位置向壁面移动,并且对颗粒的聚集速度具有激励作用;在黏弹性流体中,剪切稀化效应的发生会伴随着流体弹性的降低,从而导致颗粒由中心聚集转而向壁面聚集.另外,该文还观察到低剪切稀化且高弹性情况下颗粒惯性升力指向通道中心的现象.A relative motion model was used to numerically simulate the phenomenon of particle aggregation in shear thinning fluids.To understand the shear thinning effects on particle mechanical properties in microfluid-ics,the shear thinning matching was performed with viscoelastic and non-viscoelastic fluids.The research re-sults indicate that,shear thinning characteristics can significantly alter the mechanical properties of particles.In non-viscoelastic fluids,shear thinning can cause the aggregation position of particles to move towards the wall,and has an incentive effect on the aggregation speed of particles.In viscoelastic fluids,the occurrence of shear thinning will bring a decrease of the fluid elasticity,resulting in particle convergence from the center to the wall.

关 键 词：黏弹性流体 颗粒聚集 剪切稀化 数值模拟 

分 类 号：O359[理学—流体力学]