SOLID PARTICLE DISTRIBUTION IN PARTICLE-LADEN TURBULENT FLOWS

摘要：

Large eddy simulation of downward fully developed particle-laden turbulent channel flows were performed with considering inter-particle collisions and fluid sub-grid scale fluctuations at Reynolds number 180 and 644, respectively. The effects of Stokes numbers, turbulent flows sub-grid scale fluctuations and inter-particle collisions on the distributions of solid particles were discussed. It was verified that, regardless of the Reynolds number of fluid flows, the maximum departure from randomness is when the ratio of the particles aerodynamic response time to the Kolmogorov time scale of flow was approximately one. In addition, the simulation results showed that the degrees of particle preferential concentration are selectively associated with the sub-grid scale fluctuations of fluid turbulence because preferred particles were affected by preferred scale of the eddy structure around.

作者: K. Lei K. Kase N. Oshima T. Kobayashi

作者单位: VCAD Modeling Team, RIKEN, Wako, 351-0198, Japan Graduate School of Engineering, Hokkaido University, Sapporo, 060-8628, Japan President, Japan Automobile Research Institute, Tokyo, 105-0012, Japan

会议类型: 国际会议

会议名称: 首届亚洲计算传热与计算流体国际会议(2007 Asian Symposium on Computational Heat Transfer and Fluid Flow)

会议地点: 西安

会议语种:英文

在线出版日期: 2007-10-08（万方平台首次上网日期，不代表论文的发表时间）