一个气固两相流动阻力的新模型

THEORETICAL MODEL OF DRAG BETWEEN GAS AND SOLID PHASE

为了解决现有经验气固阻力模型的普适性问题 ,合理描述颗粒团聚现象对气固阻力的严重影响 ,从理论分析入手 ,将传统的CFD方法与系统能量分析方法相结合 ,建立了计及颗粒团聚效应的气固阻力分析模型 .与现有模型相比 ,新模型不仅合理地描述了气固两相相互作用的物理过程 ,而且避免了以往采用经验系数所导致的误差和局限性 .经循环流化床数值模拟的检验证明 ,新模型的计算结果与实验数据吻合 ,从而在稠密气固两相流动的数值模拟中具有相当的优越性 .

For describing the cluster phenomenon and its effect on drag force in gas-solid two-phase flow, the paper analyzed theoretically developed a model of gas-solid drag force in Eulerian frame under consideration of cluster effects by using the energy minimization concept. Comparing with the existing models, the new model can describe the interaction between gas phase and particle phase reasonably, and avoid error caused by the inaccurate experiential coefficient. In the numerical simulation of a CFB apparatus, the result of the new model agrees with the experiment data well, so it shows the remarkable advantage or simulation of dense gas-solid two-phase flow.