Entransy dissipation analysis of interfacial convection enhancing gasliquid mass transfer process based on field synergy principle

doi:10.1016/j.cjche.2019.03.017

中国化学工程学报 ›› 2019, Vol. 27 ›› Issue (8): 1777-1788.DOI: 10.1016/j.cjche.2019.03.017

• Fluid Dynamics and Transport Phenomena • 上一篇下一篇

Entransy dissipation analysis of interfacial convection enhancing gasliquid mass transfer process based on field synergy principle

Dong Li, Aiwu Zeng

State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China

收稿日期:2018-02-03 修回日期:2019-02-16 出版日期:2019-08-28 发布日期:2019-11-16
通讯作者: Aiwu Zeng
基金资助:
Supported by the National Key Technology Research and Development Program of the Ministry of Science and Technology of the People's Republic of China (2007BAB24B05).

Entransy dissipation analysis of interfacial convection enhancing gasliquid mass transfer process based on field synergy principle

Dong Li, Aiwu Zeng

State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China

Received:2018-02-03 Revised:2019-02-16 Online:2019-08-28 Published:2019-11-16
Contact: Aiwu Zeng
Supported by:
Supported by the National Key Technology Research and Development Program of the Ministry of Science and Technology of the People's Republic of China (2007BAB24B05).

摘要/Abstract

摘要： An exploration of the gas CO₂ absorbed into liquid ethanol accompanied with Rayleigh convection is performed by analyzing the mass entransy dissipation; this new statistical quantity is introduced to describe the irreversibility of mass transfer potential capacity. Based on the general advection-diffusion differential equation for an unsteady mass transfer process, the variation of the included angle between the velocity vector and concentration gradient fields is investigated to reveal the underlying mechanism of interfacial convection enhancing mass transfer. Results show some identical characteristics with the qualitative analyses of the synergy effects generated by the concentration and velocity fields after interfacial convection occurring for a boundary condition of fixed surface concentration. And the equivalent mass resistance for convective mass transfer process presents the similar variation with the reciprocal of instantaneous mass transfer coefficient. Accordingly, it is reasonable to be seen that mass transfer dissipation rate could be provided to assess the convection strength and explain fundamentally how Rayleigh convection improves mass transfer performance through establishing a close relationship between the mass transfer capacity and field synergy principle from the view of mass transfer theory.

关键词: Field synergy, Mass entransy dissipation, Equivalent mass resistance, Interfacial convection, Reinforcement

Abstract: An exploration of the gas CO₂ absorbed into liquid ethanol accompanied with Rayleigh convection is performed by analyzing the mass entransy dissipation; this new statistical quantity is introduced to describe the irreversibility of mass transfer potential capacity. Based on the general advection-diffusion differential equation for an unsteady mass transfer process, the variation of the included angle between the velocity vector and concentration gradient fields is investigated to reveal the underlying mechanism of interfacial convection enhancing mass transfer. Results show some identical characteristics with the qualitative analyses of the synergy effects generated by the concentration and velocity fields after interfacial convection occurring for a boundary condition of fixed surface concentration. And the equivalent mass resistance for convective mass transfer process presents the similar variation with the reciprocal of instantaneous mass transfer coefficient. Accordingly, it is reasonable to be seen that mass transfer dissipation rate could be provided to assess the convection strength and explain fundamentally how Rayleigh convection improves mass transfer performance through establishing a close relationship between the mass transfer capacity and field synergy principle from the view of mass transfer theory.

Key words: Field synergy, Mass entransy dissipation, Equivalent mass resistance, Interfacial convection, Reinforcement

Dong Li, Aiwu Zeng. Entransy dissipation analysis of interfacial convection enhancing gasliquid mass transfer process based on field synergy principle[J]. 中国化学工程学报, 2019, 27(8): 1777-1788.

Dong Li, Aiwu Zeng. Entransy dissipation analysis of interfacial convection enhancing gasliquid mass transfer process based on field synergy principle[J]. Chinese Journal of Chemical Engineering, 2019, 27(8): 1777-1788.

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Entransy dissipation analysis of interfacial convection enhancing gasliquid mass transfer process based on field synergy principle

Entransy dissipation analysis of interfacial convection enhancing gasliquid mass transfer process based on field synergy principle

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