摘要
在气相湍流流动的k-ε模型基础上,建立了颗粒动力学与湍动能耦合的稠密两相流动数学模型。颗粒相的有效粘性系数取决于颗粒之间相互碰撞而引起的层流粘性以及颗粒微团的湍流脉动而形成的湍流粘性,其中颗粒的碰撞行为以及所形成的颗粒的层流特性用颗粒动力学模型来描述,颗粒的湍流特性采用颗粒湍动能输运方程模型来描述。利用所建立的模型对提升管内气固两相流动过程进行了数值模拟,可以合理地预报出提升管内气固两相的环核流动结构。
A comprehensive model is developed in the present work in which a two-equation (ft - e) turbulence model is used for calculating the gas phase. In addition, a transport equation of particle phase turbulent kinetic energy is proposed and used for modeling the particle phase turbulence ( kp model). Similar to that of the single gas phase, effective viscosity of the particle phase is the sum of the laminar viscosity caused by particle-particle collisions described by kinetic theory and the turbulent viscosity caused by collections of particles described by the kp model. The present model is used to predict gas-particle flows in a riser. Results obtained using this model compare well with experimental data.
出处
《计算机与应用化学》
CAS
CSCD
北大核心
2003年第1期186-190,共5页
Computers and Applied Chemistry
