The dispersion of particles in turbulent semi-circular duct flows

作     者：Min Liu Jun Yao Yan-Lin Zhao Min Liu;Jun Yao;Yan-Lin Zhao

作者机构：International Joint Laboratory on Clean Energy Science and TechnologyCollege of Mechanical and Transportation EngineeringChina University of Petroleum-BeijingBeijing102249People's Republic of China Beijing Key Laboratory of Process Fluid Filtration and SeparationCollege of Mechanical and Transportation EngineeringChina University of Petroleum-BeijingBeijing102249People's Republic of China 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2021年第18卷第4期

页      面：1240-1255页

核心收录：

学科分类：081704[工学-应用化学] 08[工学] 0817[工学-化学工程与技术] 081701[工学-化学工程] 

基　　金：supported by National Natural Science Foundation of China(No.51876221,51776225) High-end Foreign Expert Introduction Project(G20190001270,B18054) 

主　　题：Semi-circular duct Secondary flow Particle dispersion Turbulence Large eddy simulation 

摘      要：The flow field in a semi-circular duct is simulated by Large Eddy Simulation(LES)and its particle field is simulated by Lagrange particle tracking *** number Reb(based on bulk velocity and hydraulic diameter)is 80,000 and Ret(based on friction velocity and hydraulic diameter)is *** diameter dpis chosen as 10,50,100,500 mm corresponding to St as 0.10,2.43,9.72,*** results show that the intensity of the secondary flow near the ceiling is less than that near the floor because the ceiling is curved and able to inhibit the secondary *** is found that the difference between the semicircular duct and the square duct is that the secondary flow in a corner of the semi-circular duct is not symmetrical along the diagonal although they have the same generation *** the particles,small particles(dp≤10 mm)are found to uniformly distribute in the duct,while large particles(dp≥50 mm)preferentially distribute in the corner and floor *** maximum particles(dp=500mm)fall on the floor quickly and their dispersion mainly depends on the secondary flow near the *** deposition in the corner depends on particle size due to the effect of secondary flow and *** effect of lift force on particles becomes more significant for 50 and 100 mm particles in comparison with other smaller *** the end,the effect of secondary flow is found to be more significant to dominate particle behavior than that of flow fluctuation.