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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。
Based on the k-ε model of gas-phase turbulent flow, a dense two-phase flow mathematical model coupled with particle dynamics and turbulent kinetic energy is established. The effective viscosity coefficient of the particle phase depends on the laminar viscosity and the turbulent viscosity formed by the turbulent pulsation of the particle micelles due to the collision between the particles. The collision behavior of the particles and the laminar flow characteristics of the particles formed are described by particle dynamics Model to describe the particle turbulence characteristics of the particle turbulent kinetic energy transport equation model to describe. The numerical simulation of the gas-solid two-phase flow in the riser is carried out by using the established model, which can reasonably predict the annular nuclear flow in the gas-solid two-phase riser.