首页|Turbulent Agglomeration of Microparticles in a Cylinder Wake Flow Using LES-DEM:Focusing on the Effect of the Reynolds Number
Turbulent Agglomeration of Microparticles in a Cylinder Wake Flow Using LES-DEM:Focusing on the Effect of the Reynolds Number
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Turbulent Agglomeration of Microparticles in a Cylinder Wake Flow Using LES-DEM:Focusing on the Effect of the Reynolds Number
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(dp=2-20 μm)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.
microparticleparticle agglomerationdiscrete element methodlarge eddy simulation
WANG Shuang、MU Lin、LI Xue、XIE Jun、DONG Ming
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School of Energy and Power Engineering,Dalian University of Technology,Dalian 116024,China
School of Optical Information and Energy Engineering,Wuhan Institute of Technology,Wuhan 430205,China
School of Energy and Environment,Shenyang Aerospace University,Shenyang 110136,China
microparticle particle agglomeration discrete element method large eddy simulation
国家科技期刊平台
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