PIV Measurement for Rayleigh Convection and Its Effect on Mass Transfer

doi:10.1016/j.cjche.2014.06.022

›› 2014, Vol. 22 ›› Issue (10): 1078-1086.DOI: 10.1016/j.cjche.2014.06.022

PIV Measurement for Rayleigh Convection and Its Effect on Mass Transfer

Wei Chen, Shuyong Chen, Xigang Yuan, Huishu Zhang, Botan Liu, Kuotsung Yu

State Key Laboratory of Chemical Engineering and School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

收稿日期:2012-11-21 修回日期:2013-03-24 出版日期:2014-10-28 发布日期:2014-12-01
通讯作者: Xigang Yuan
基金资助:
Supported by the National Natural Science Foundation of China (20736005).

PIV Measurement for Rayleigh Convection and Its Effect on Mass Transfer

Wei Chen, Shuyong Chen, Xigang Yuan, Huishu Zhang, Botan Liu, Kuotsung Yu

State Key Laboratory of Chemical Engineering and School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

Received:2012-11-21 Revised:2013-03-24 Online:2014-10-28 Published:2014-12-01
Supported by:
Supported by the National Natural Science Foundation of China (20736005).

摘要/Abstract

摘要： The velocity distribution in Rayleigh convection caused by acetone volatilization in acetone-ethyl acetate binary system was observed in a vertical cross section of an initially quiescent liquid layer by utilizing particle image velocimetry. Obvious turbulent vortexes that were induced by Rayleigh convection appeared in the bulk liquid, and its statistic features indicated that Rayleigh convection became more intensewith the increase of Ra number and ReG number. Mass transfer coefficient was measured and the computed enhancement factor indicated that Rayleigh convection could promote the surface renewal of the liquid phase and intensify the interfacial mass transfer significantly. A method was proposed for the prediction of mass transfer coefficient based on the measured velocity vector, and the predicted mass transfer coefficients are in reasonable agreement with the experimental results.

关键词: Rayleigh convection, Particle image velocimetry, Mass transfer coefficient, Enhancement of mass transfer

Abstract: The velocity distribution in Rayleigh convection caused by acetone volatilization in acetone-ethyl acetate binary system was observed in a vertical cross section of an initially quiescent liquid layer by utilizing particle image velocimetry. Obvious turbulent vortexes that were induced by Rayleigh convection appeared in the bulk liquid, and its statistic features indicated that Rayleigh convection became more intensewith the increase of Ra number and ReG number. Mass transfer coefficient was measured and the computed enhancement factor indicated that Rayleigh convection could promote the surface renewal of the liquid phase and intensify the interfacial mass transfer significantly. A method was proposed for the prediction of mass transfer coefficient based on the measured velocity vector, and the predicted mass transfer coefficients are in reasonable agreement with the experimental results.

Key words: Rayleigh convection, Particle image velocimetry, Mass transfer coefficient, Enhancement of mass transfer

Wei Chen, Shuyong Chen, Xigang Yuan, Huishu Zhang, Botan Liu, Kuotsung Yu. PIV Measurement for Rayleigh Convection and Its Effect on Mass Transfer[J]. , 2014, 22(10): 1078-1086.

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PIV Measurement for Rayleigh Convection and Its Effect on Mass Transfer

PIV Measurement for Rayleigh Convection and Its Effect on Mass Transfer

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