Turbulent Agglomeration of Microparticles in a Cylinder Wake Flow Using LES-DEM:Focusing on the Effect of the Reynolds Number  

作　　者：WANG Shuang MU Lin LI Xue XIE Jun DONG Ming 

机构地区：[1]School of Energy and Power Engineering,Dalian University of Technology,Dalian 116024,China [2]School of Optical Information and Energy Engineering,Wuhan Institute of Technology,Wuhan 430205,China [3]School of Energy and Environment,Shenyang Aerospace University,Shenyang 110136,China

出　　处：《Journal of Thermal Science》2025年第1期34-49,共16页热科学学报(英文版)

基　　金：the financial support by the National Natural Science Foundation of China(Grant No.51876031,No.52176179)。

摘　　要：Turbulent agglomeration is viewed as a promising technology for enhancing fine particle removal efficiency.To better understand particle transport,agglomeration behaviors,and fluid-particle interactions,we numerically explored these phenomena under cylindrical vortex wake influence using a coupled large eddy simulation and discrete element method(LES-DEM)approach.The validity of the LES approach was verified by comparison with available direct numerical simulation(DNS)results.We adopted the Johnson-Kendall-Roberts(JKR)contact model for particle-particle interactions.The particle dispersion and agglomeration characteristics of particles with different diameters(d_(p)=2-20μm)in the laminar and transition of shear layer(TrSL)flow regimes were analyzed.Fine particles were concentrated at the vortex centers,while larger particles accumulated around the vortices.The agglomeration efficiency exhibited an M-shaped profile spanwise(y-direction).With increasing Reynolds number,the agglomeration efficiency and turbulence intensity improve.The particle agglomeration efficiency peaks at a certain Reynolds number.However,at higher Reynolds numbers,reducing the residence time of particles in the flow field decreases the agglomeration efficiency.

关 键 词：MICROPARTICLE particle agglomeration discrete element method large eddy simulation 

分 类 号：O35[理学—流体力学]