文献类型：期刊文献

英文题名：Numerical simulation of carbon dioxide (CO2) absorption and interfacial mass transfer across vertically wavy falling film

作者：Hu, Jianguang[1];Yang, Xiaogang[1,2];Yu, Jianguo[1];Dai, Gance[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 210007, Peoples R China;[2]Univ Nottingham, Int Doctoral Innovat Ctr, Ningbo 315100, Zhejiang, Peoples R China

年份：2014

卷号：116

起止页码：243

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20142317789411);WOS:【SCI-EXPANDED(收录号:WOS:000340330500023)】；

基金：JH acknowledges the support of the State Key Laboratory of Chemical Engineering, East China University of Science and Technology for a doctoral program scholarship in conducting the study. XY especially thanks the University of Nottingham Ningbo for supporting the joint research collaboration and the support of the 111 Project of China.

语种：英文

外文关键词：Falling films; Mass transfer; Hydrodynamics; Interface; Carbon dioxide absorption; Vorticity

摘要：The process of CO2 absorption in many currently used chemical devices can be typically characterised and analysed by mass transfer across a thin falling film gas-liquid interface. There is still a lack of general predictability of the transfer quantity based on the basic hydrodynamic parameters involved in such mass transfer processes, and certain important phenomena associated with the transfer still remain unexplained. A novel concept that utilises the correlation between the vorticity neighbouring the falling film gas-liquid interface and the gas concentration to characterise CO2 absorption mass transfer by the falling film is proposed in this work. Numerical simulations using a volume of fluid (VOF) approach were performed for a vertical falling film arrangement. The wave hydrodynamics and the associated mass transfer are discussed, and the numerical results are compared with the existing experimental empirical relationships. In particular, the mass transfer across the falling film interface is interpreted as the passive scalar entrapment and entrainment by the interfacial vortices. The numerical simulation clearly indicates that two types of vortices exist: wall-bounded vortices associated with primary shear in the falling film and interfacial vortices associated with weaker shear in the vicinity of the interface. The numerical simulation reveals that mass transfer across the falling film is highly correlated with the interfacial vorticity Omega(i), thus indicating the use of (c Omega(i)) over bar is able to characterise the mass transfer across the falling film gas-liquid interface. (C) 2014 Elsevier Ltd. All rights reserved.