基于不同曳力模型的鼓泡流化床内流体动力特性数值研究

Hydrodynamics of a Freely Bubbling Fluidized Bed Numerical Research Based on Different Drag Force Model

基于欧拉-欧拉双流体模型,数值模拟研究了底部中心射流布风鼓泡流化床内气固两相流体动力特性。分别采用3种曳力模型考察了气泡的形成、上升及破裂过程,气泡形状和颗粒运动特征,以及气泡直径等鼓泡床内气固两相流体动力特性。同时考察了弹性恢复系数对床内气泡直径的影响。模拟结果显示,不同的曳力模型对鼓泡床内流体动力特性具有较重要影响,同时,弹性恢复系数对气泡特性影响较大。模拟结果与实验结果进行了对比,符合较好。

Euler-Euler two-fluid model is used to numerically investigate the flow dynamics of gas-solid two-phase flow in center jet air bubbling fluidized bed. Three types of drag force models are used to simulate the process of two-phase flow patterns in the bubbling fluidized bed, including the bubble formation, rise and split process, bubble diameter and bubble velocity. The bubble diameter change regulation is compared under different coefficients of elastic recovery. Numerical results indicate that different drag force models can fully interact with the flow dynamics and coefficients of elastic recovery can influence on bubble characteristics. The simulation results are in good agreement with the experimental results.