A porous media model for CFD simulations of gas-liquid two-phase flow in rotating packed beds
A porous media model for CFD simulations of gas-liquid two-phase flow in rotating packed beds
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DOI：
10.1016/j.ces.2018.04.074
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发表时间：
2018-11-02
影响因子：
4.7
通讯作者：
Pourkashanian, M.
中科院分区：
文献类型：
--
作者：
Lu, X.;Xie, P.;Pourkashanian, M.
旋转填料床（RPB）具有较高的相接触效率和混合效率，是工业气液两相反应过程中一种很有前途的先进反应器。使用CFD模拟研究RPB将提高对此类反应器中气体和液体流动的物理行为的理解。目前，对旋转翼的CFD模拟主要集中在流体体积法（VOF）上。然而，VOF方法是不适合模拟中试规模的2D和3D RPB由于计算机资源的限制，而欧拉方法使用多孔介质模型是一个很有前途的替代方法，但它很少报道。原因是由于RPB中使用的高孔隙率和堆叠的金属丝网填料，没有合适的多孔介质模型准确描述气体和液体、气体和固体以及液体和固体之间的拖曳力。因此，本文的目的是提出一个新的模型RPB建模。新提出的模型是基于Kolodziej高孔隙度丝网单相多孔介质模型。在这项工作中，两个实验逆流气液流动的情况下，从文献中已被用于验证CFD模拟结果。最后，新模型已与目前的多孔介质模型，传统的球形或结构狭缝填充床，这是Attou，Lappalainen，Iluta和张模型进行了比较。仿真结果表明，所提出的新模型是最合适的和准确的模型中所研究的所有模型的RPB的仿真。(C)2018作者（S）爱思唯尔有限公司出版
The rotating packed bed (RPB) is a promising advanced reactor used in industrial gas-liquid two-phase reaction processes because of its high phase contact efficiency and mixing efficiency. Investigation of RPBs using CFD simulations will improve the understanding of physical behaviours of gas and liquid flows in such reactors. Currently, CFD simulations on the RPBs only focus on the volume of fluid (VOF) method. However, the VOF method is not suitable for simulations of pilot-scale 2D and 3D RPBs due to the limitations in computer resources, while the Eulerian method using a porous media model is a promising alternative method but it is rarely reported. The reason is that there are no suitable porous media models that accurately describe the drag force between the gas and liquid, the gas and solids and the liquid and solids due to the high porosity and the stacked wire screen packing used in RPBs. Therefore, the purpose of this paper is to propose a new model for modelling RPBs. The new proposed model is based on the Kolodziej high porosity wire screen one-phase porous media model. In this work, two experimental counter-current gas-liquid flow cases from the literatures have been used for validating the CFD simulation results. Finally, the new model has been compared with the current porous media models for traditional spherical or structured slit packed beds, which are the Attou, Lappalainen, Iliuta and Zhang models. The simulation results show that the proposed new model is the most appropriate and accurate model for the simulation of RPBs among all the models investigated in this paper. (C) 2018 The Author(s). Published by Elsevier Ltd.