| Effect of Marangoni Convection on Mass Transfer in Liquid Phase |
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| 作者姓名： | 余黎明 曾爱武 余国琮 |
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| 作者单位： | State Key Laboratory of Chemical Engineering School of Chemical Engineering and Technology Tianjin University，State Key Laboratory of Chemical Engineering School of Chemical Engineering and Technology Tianjin University，State Key Laboratory of Chemical Engineering School of Chemical Engineering and Technology Tianjin University，Tianjin 300072 China Tianjin 300072 China Tianjin 300072 China |
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| 摘 要： | Marangoni effectis of interestto the chemical en-gineers from both scientific and practical points ofview1—6]. The Marangoni convection contributes tothe renewal of the interfacial surface and is capable ofincreasing the mass transfer rate, resulting in intensi-fication of separation processes such as distillation,extraction, absorption, and desorption. The theoretical studies of Marangoni instability inthe past were focused on determining the critical tran-sition point. The critical condit…
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| 关 键 词： | Marangoni对流 纹影技术 增强因子 舍伍德数 液相 传质 |
| 收稿时间： | 2005-09-09 |
Effect of Marangoni Convection on Mass Transfer in Liquid Phase |
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| YU Liming,ZENG Aiwu,YU Kuo Tsung.Effect of Marangoni Convection on Mass Transfer in Liquid Phase[J].Transactions of Tianjin University,2006,12(6):391-398. |
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| Authors: | YU Liming ZENG Aiwu YU Kuo Tsung |
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| Abstract: | 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%. |
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| Keywords: | Marangoni convection Schlieren technique enhancement factor Sherwood number |
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