循环流化床提升管内稠密固液湍流的流体动力学模拟

为揭示循环流化床内稠密固液两相流动特性,对反应器内稠密固液湍流进行了流体动力学模拟.在考虑颗粒碰撞的欧拉-欧拉双流体模型的基础上,通过研究相间拖拽力模型和颗粒碰撞恢复系数的影响,建立了描述循环流化床内稠密固液湍流的流体动力学模型,并利用模型预测了反应器提升管中高浓度颗粒速度、体积分数分布和湍流特性.预测结果与实验结果符合很好,表明理论模型和求解方法有效.

CFD Simulation of Dense Liquid-solid Turbulence in Riser

In order to find out the hydrodynamics of dense liquid-solid flow in circulating fluidized bed (CFB), Computational Fluid Dynamics simulation is applied to two-phase turbulence system. On the base of Eulerian Eulerian two-fluid model, by studying particle-particle collision, its influences of various inter-phase drag models and the collisional restitution coefficients, a theory model has been established which describes dense liquid-solid turbulence flow in CFB. Based on these, the radial distributions of solid axial velocity, holdup and turbulence parameters are predicted. The prediction has agreed with experiment data very well, so it is confirmed that the theory model and computing process are valid.