关键词:

二阶矩, 各向异性颗粒动理学, 鼓泡床, 数值模拟

Abstract:

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).

Key words:

二阶矩, 各向异性颗粒动理学, 鼓泡床, 数值模拟