Effect of Marangoni Convection on Mass Transfer in Liquid Phase  

作　　者：余黎明 曾爱武 余国琮 

机构地区：[1]State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University

出　　处：《Transactions of Tianjin University》2006年第6期391-398,共8页天津大学学报（英文版）

基　　金：Supported by National Natural Science Foundation of China(No.20136010).

摘　　要：Marangoni convection and its influence on the mass transter in the liquid phase were investigated. Marangoni convection was visualized using laser Schlieren technique, Orderly polygonal convection patterns and random interfacial turbulence were observed. The effect of Marangoni convection on the mass transfer rate was studied by desorbing ethanol from aqneous solution in the falling film. The experimental results show that Marangoni convection can speed up the surface real and enhance the mass transfer rate in the liquid phase.The liquid mass transfer coefficient can be enhanced by as much as 3 folds. The corresponding empirical correlations are given in terms of the mass transfer enhancement factor. Furthermore, in considering the Marangoni effect, the conventional mass transfer correlation was modified, The differences between the values predicted by the correlation and the experimental data are within ±8.2% and the average difference is 4.2%.Marangoni convection and its influence on the mass transfer in the liquid phase were investigated. Marangoni convection was visualized using laser Schlieren technique. Orderly polygonal convection patterns and random interfacial turbulence were observed. The effect of Marangoni convection on the mass transfer rate was studied by desorbing ethanol from aqueous solution in the falling film. The experimental results show that Marangoni convection can speed up the surface renewal and enhance the mass transfer rate in the liquid phase. The liquid mass transfer coefficient can be enhanced by as much as 3 folds. The corresponding empirical correlations are given in terms of the mass transfer enhancement factor. Furthermore, in considering the Marangoni effect, the conventional mass transfer correlation was modified. The differences between the values predicted by the correlation and the experimental data are within ±8.20/0 and the average difference is 4.20/0.

关 键 词：Marangoni convection Schlieren technique enhancement factor Sherwood number 

分 类 号：TQ021.4[化学工程]