筛孔塔板气液两相流流场的数值模拟

考虑了气液两相间的曳力、虚拟质量力和升力，采用Eulerian两相流模型，使用CFD商用软件STAR-CD v3.26数值计算了直径0.3m精馏塔板气液两相流流场。模拟计算选用清液层高度作为衡量非稳态流场收敛判别标准。在不同空塔气速下，对比了清液层高度的计算值和文献报道的实验值，二者吻合较好。可以看出CFD模型可以较为准确的描述筛孔塔板上瞬时气液两相流场。模拟结果表明，塔板上液体流场可分为主流区、回流区和反混区，回流区面积随清液层高度增加而减小，塔板上气液两相存在着显著的动量传递现象。

Simulation Flow Filed of Hydraulics of Two Phases Fluid on Sieve Tray

Considering the drag force, virtual mass force and lift force in the Eulerian framework as two interpenetrating phases, three-dimensional flow field in a 0.3 m diameter sieve tray of the fractionating tower were simulated by using the computational fluid dynamics （CFD） STAR-CD v3. 26 softerwire. The numerical convergence standard of the computing unstable flow field is the numerical clear liquid height. On the different gas velocities, the numerical results of clear liquid height was in accordance with experimental results. It shows that the method of CFD simulation the flow filed of the liquid and gas phase in the sieve tray of the fractionating tower is doable and credible. The simulation results show that there is the district of the main flow, inverse flow and circulation flow. When clear liquid height increased, the area of inverse flow decreased. There is the interphase momentum exchange of the liquid and gas phase in the sieve tray of the fractionating tower.