Effect of Marangoni Convection on Mass Transfer in Liquid Phase
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 ± 8.2% and the average difference is 4.2%.
作 者： YU Liming ZENG Aiwu YU Kuo Tsung 作者单位： State Key Laboratory of Chemical Engineering,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China 刊 名： 天津大学学报（英文版） EI 英文刊名： TRANSACTIONS OF TIANJIN UNIVERSITY 年，卷(期)： 2006 12(6) 分类号： O6 关键词： Marangoni convection Schlieren technique enhancement factor Sherwood number