CFD Simulations Of The Flow And Mass Transfer In The Structured Packings

In order to accurately describe the process of gas-liquid two-phase flow and mass transfer for structured packing column which involved in the multi-scale flow and mass transfer phenomena, and thus a better grasp and understanding the flow and mass transfer mechanism of the packing chip, in this thesis, the gas-liquid flow and mass transfer at micro-scale have been simulated.Established the model of computational fluid dynamics and mass transfer involving in description of gas-liquid two-phase flow and mass transfer of structured packing column at micro-scale.Therefore, a two-dimensional two-phase flow CFD model using the VOF method is presented, using the momentum source terms:the surface tension and shear stress of the momentum source term which mentioned in the literature, and produced a UDF subroutine of the source term which have the great influence to the two-phase flow.Acooriding to the results of simulation, it discussed the diference two-phase flow between flat and corrugated board, and the influence of the liquid film and other important parameters of flow field about the board structure, liquid rate and gas flow rate, and the influence of the wall shear stress about the wall structured, liquid flow rate and gas flow rate; so as to explore the influence of liquid film thickness, length of residence time, the shape of liquid film about wall shear stress.Base on the model of computational fluid dynamics of the two-phase flow, it proposed the method to solve the problem of mass transfer between two different phases which the standard module of FLUENT cannot realize. It proposed the model of transfer transport and discussed the method of working out about the mass transfer source which can reflect the mass transfer, and preparing UDS, UDF subroutine to achieve the above requirements. By the results of simulation, analysis the influence of the effect of mass transfer about the gas flux and corrugated board structure.