稠密气固两相流动的颗粒二阶矩方法及鼓泡床流化特性的模拟  

Second-order moments of particles for dense gas-solid flow and numerical flow behavior simulation in bubbling fluidized bed

作　　者：孙丹[1] 陈巨辉[1] 王帅[1] Mbouana N.L. 赵云华[1] 陆慧林[1] 

机构地区：[1]哈尔滨工业大学能源科学与工程学院,黑龙江哈尔滨150001

出　　处：《化工学报》2009年第10期2460-2466,共7页CIESC Journal

基　　金：国家自然科学基金项目(50776023)~~

摘　　要：A second-order moment model of particles in dense gas-solid flow is proposed based on the kinetic theory of granular flow.The solid phase constitutive model is closed with the approximated third-order moment enclosure equation of particle velocity from the elementary transport theory.The boundary conditions of particles are proposed in considering the energy transfer and dissipations by collisions between the wall and particles.Flow behavior of particles is numerically simulated in a bubble fluidized bed,which indicates the distinct anisotropy behavior of the turbulent particles.Simulated particle velocities are in agreement with the measurements by Muller et al(2008) and Yuu et al(2001).Predicted second-order moment of velocity has the same trend as that of measurements.The calculated Reynolds stresses per unit bulk density agree with the measured data by Muller et al(2008) and with the fluctuating velocity of particles measured by Yuu et al(2001).A second-order moment model of particles in dense gas-solid flow is proposed based on the kinetic theory of granular flow. The solid phase constitutive model is closed with the approximated thirdorder moment enclosure equation of particle velocity from the elementary transport theory. The boundary conditions of particles are proposed in considering the energy transfer and dissipations by collisions between the wall and particles. Flow behavior of particles is numerically simulated in a bubble fluidized bed, which indicates the distinct anisotropy behavior of the turbulent particles. Simulated particle velocities are in agreement with the measurements by Muller et al （2008） and Yuu et al （2001） . Predicted secondorder moment of velocity has the same trend as that of measurements. The calculated Reynolds stresses per unit bulk density agree with the measured data by Muller et al （2008） and with the fluctuating velocity of particles measured by Yuu et al （2001）.

关 键 词：二阶矩 各向异性颗粒动理学 鼓泡床 数值模拟 

分 类 号：TK229[动力工程及工程热物理—动力机械及工程]