Large Eddy Simulation of the Particle Coagulation in High Concentration Particle-Laden Planar Jet Flow

查看全文 作　　者：LIN [1]Peifeng;WU [2]Dichong;YU [3]Mingzhou;WANG [1]Chao;ZHANG [1]Lite;ZHU [4]Zefei

机构地区：[1]Faculty of Mechanical Engineering & Automation, Zhejiang Sci-Tech University, Hangzhou 310018, China;[2]Business Administration College, Zhejiang University of Finance and Economics, Hangzhou 310000, China;[3]Department of Physics, China Jiliang University, Hangzhou 310018, China;[4]School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China

出　　处：《Chinese Journal of Mechanical Engineering》索引2011年第24卷第6期,共10页

基　　金：supported by National Natural Science Foundation of China (Grant No. 50976107);National Key Technology R&D Program of China (Grant No. 2009BAF39B01);the Science Foundation of Zhejiang Sci-Tech University (ZSTU) of China (Grant No. 1003808-Y) 摘　　要：Particle coagulation by Brownian motion is an important but difficult research topic.When particle volume concentration is larger than 0.1%,the classic SMOLUCHOWSKI equation is not applicative anymore.The high concentration coagulation,with HEINE's correction,source terms for the Taylor-series expansion method of moments(TEMOM) are firstly driven in this paper.Ultra-fine particle(d0?100 mm) with initial volume fraction f?1% coagulation in a planar jet turbulence flow is simulated via the large eddy simulation(LES).The instantaneous and time-averaged particle distributions and the high concentration enhancement are given out.The particle number concentration distribution results show that the coagulation is more intense comparing to dilute case in previous research,especially near the nozzle exit.After jet flow is fully developed,the effect is much more obvious at the region between vortexes.The time-averaged γ(the high concentration enhance factor) distributes sharply and symmetrically about the jet centerline at the upstream,but becomes broad and flat at downstream where the cross-stream averaged γ fluctuates drastically.As a new attempt,this paper shows Brownian coagulation with high concentration also can be calculated via TEMOM appropriately,and the coagulation at the region between vortexes is about 1.38 times intensive of the dilute result calculated by the classic Smoluchowski theory. 关键词：体积浓度大涡模拟平面射流粒子分布 SMOLUCHOWSKI方程凝固气固两相布朗运动

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Large Eddy Simulation of the Particle Coagulation in High Concentration Particle-Laden Planar Jet Flow

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