高雷诺数层流管道中颗粒惯性聚集力学成因的数值研究  

Numerical Analysis on Inertial Focusing of Particles in Laminar Pipe Flow with High Reynolds Number

作　　者：钱佳杰 朱亮 王企鲲[1] 薛壮壮 QIAN Jiajie;ZHL Liang;WANG Qikun;XUE Zhuangzhuang(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学能源与动力工程学院

出　　处：《轻工机械》2019年第6期25-31,共7页Light Industry Machinery

基　　金：教育部博士点基金资助项目(20113120120003)

摘　　要：根据高雷诺数和低雷诺数层流管道中颗粒不同的聚集情况,课题组根据"相对运动原理"并结合CFD技术,建立了"相对运动模型"。采用数值模拟研究了在圆形截面通道高雷诺数层流中颗粒所受惯性升力的空间分布特征;探究了颗粒惯性聚集现象在高雷诺数层流管道中所出现的内部聚集圆环的力学成因和影响因素。研究结果表明:颗粒在高雷诺数工况下所受的惯性升力的空间分布规律与低雷诺数工况完全不同;在靠近通道中心处出现了新的升力零点,是形成颗粒内环聚集区域的力学成因。这种现象的产生和颗粒表面的剪切应力分布及压力分布有关,其中剪切应力分布的变化占主导作用。According to the different aggregation conditions of particles in high Reynolds number laminar flow pipes and in low Reynolds number laminar flow pipes,the " relative motion model" was established based on the " principle of motion relativity" and the combination of CFD( Computational Fluid Dynamics) technique. The spatial characteristics of inertial lift force applied on the particles in high Reynolds number laminar were numerically investigated in a circular cross section of the pipe. The mechanical cause and influencing factors of the inner annulus of focusing particles in the high Reynolds number laminar flow pipeline were studied. The results show that the spatial characteristics of inertial lift force on the particles inside the laminar pipe flow with high Reynolds number are completely different from those inside the laminar pipe flow with low Reynolds number. A new lift zero point appears near the center of the channel,which is the mechanical cause of the formation of the inner annulus of the particle. The occurrence of this phenomenon is related to the shear stress and pressure distribution on the particle surface,and the changes of the shear stress are the main cause.

关 键 词：颗粒惯性聚集 高雷诺数层流 管道流动 惯性升力 颗粒聚集内环 剪切应力 

分 类 号：O359[理学—流体力学]