Transitional phenomenon of particle dispersion in gas-solid two-phase flows

作     者：LUO Kun FAN JianRen CEN KeFa 

作者机构：State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 China 

出 版 物：《Chinese Science Bulletin》 (CHINESE SCIENCE BULLETIN)

年 卷 期：2007年第52卷第3期

页      面：408-417页

核心收录：

学科分类：081704[工学-应用化学] 080704[工学-流体机械及工程] 08[工学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 081701[工学-化学工程] 

基　　金：the National Natural Science Foundation of China (Grant No. 50506027) 

主　　题：气固两相流 颗粒分散 瞬变现象 湍流模型 直接数值模拟 

摘      要：Without using any turbulent model, direct numerical simulation of a three-dimensional gas-solid two-phase turbulent jet was performed by finite volume method. The effects on dispersion of particles with different Stokes numbers by the transitional behavior of turbulent structures were investigated. To produce high-resolution results and reduce the computation and storage, the fractional-step projection algorithm was used to solve the governing equations of gas phase fluid. The low-storage, three-order Runge-Kutta scheme was used for time integration. The governing equations of particles were solved in the Lagrangian framework. These numerical schemes were validated by the good agreement be-tween the statistical results of flow field and the related experimental data. In the study of particle dis-persion, it was found that the effects on particle dispersion by the spanwise vortex structures were prominent. The new behaviors of particle dispersion were also observed during the evolution of the flow field, i.e. the transitional phenomenon of particle dispersion occurs for the particles with small and intermediate Stokes numbers.