Abstract: Misdistribution of gas and liquid flow is a familiar phenomenon occurred in structured packing columns and is the main reason for the decrease of mass transfer efficiency. But there is still no published research work in investigating this effect by numerical method. In this paper, a computational fluid dynamic (CFD) model for predicting the hydrodynamics of gas flow in the structured packing is presented, which associated with the boundary condition about the interface shear stress of gas and liquid. Combined the CFD model of gas phase, the crunode meshwork model of the liquid phase given in literature and some classical mass-transfer theories, a hybrid CFD method for predicting the mass transfer efficiency for metal sheet corrugation structured packing is presented. Comparing the simulated results with the experimental data, a good agreement is shown. The method presented in this paper provides a new notion for the quantitative research of mass transfer process for structured packing columns.

摘要： 气液两相不均匀流动是造成填料塔传质效率下降的主要原因之一.采用计算流体力学方法，定量分析规整填料内气液两相流动对传质效率影响的研究尚未见文献报道.从Navier-Stokes方程出发，首先建立了考虑气液之间相互作用的CFD计算模型，定量描述了填料片内的气相流场分布.在此基础上，结合文献中提出的液相结点分布模型及一些经典的传质理论，初步提出了适用于定量计算金属板波纹填料传质效率的耦合型算法，并对规整填料内的传质效率进行了计算，模型结果与实验值吻合较好.为规整填料传质效率的定量研究提供了新的方法和思路.