Convective mass transfer enhancement in a membrane channel by delta winglets and their comparison with rectangular winglets

doi:10.1016/j.cjche.2015.09.006

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (11): 1755-1762.DOI: 10.1016/j.cjche.2015.09.006

Convective mass transfer enhancement in a membrane channel by delta winglets and their comparison with rectangular winglets

Jingchun Min¹, Bingqiang Zhang^2,3

1 School of Aerospace, Tsinghua University, Beijing 100084, China;
2 Institute of Spacecraft Engineering, China Academy of Space Technology, Beijing 100094, China;
3 Beijing Key Laboratory of Space Thermal Control Technology, Beijing 100094, China

收稿日期:2015-02-11 修回日期:2015-07-11 出版日期:2015-11-28 发布日期:2015-12-18
通讯作者: Jingchun Min
基金资助:
Supported by TsinghuaUniversity Initiative Scientific Research Program(20131089319).

Convective mass transfer enhancement in a membrane channel by delta winglets and their comparison with rectangular winglets

Jingchun Min¹, Bingqiang Zhang^2,3

1 School of Aerospace, Tsinghua University, Beijing 100084, China;
2 Institute of Spacecraft Engineering, China Academy of Space Technology, Beijing 100094, China;
3 Beijing Key Laboratory of Space Thermal Control Technology, Beijing 100094, China

Received:2015-02-11 Revised:2015-07-11 Online:2015-11-28 Published:2015-12-18
Contact: Jingchun Min
Supported by:
Supported by TsinghuaUniversity Initiative Scientific Research Program(20131089319).

摘要/Abstract

摘要： Numerical calculations were conducted to simulate the flow and mass transfer in narrow membrane channels equipped with delta winglets, which are often used as longitudinal vortex generators to enhance heat transfer in heat exchanger applications. The channel consists of an impermeable solid wall and a membrane. The delta winglets are attached to the solidwall surface to enhance the mass transfer near themembrane surface and suppress the concentration polarization. Thewinglet performancewas evaluated in terms of concentration polarization factor versus consumed pumping power. Calculations were implemented for NaCl solution flow in a membrane channel having a height of 2.0 mmfor Reynolds numbers ranging from 400 to 1000. The delta winglets were optimized under equal pumping power condition, and the results of optimization suggest winglet height of 5/6 of the channel height, aspect ratio of 2.0, attack angle of 30°, and awinglet interval equal to the channel height. The optimal deltawingletswere comparedwith the optimal rectangular wingletswe found previously, and it is shown that the rectangular winglets yield a somewhat better performance than the delta winglets.

关键词: Membrane process, Concentration polarization, Mass transfer enhancement, Delta winglet, Pumping power

Abstract: Numerical calculations were conducted to simulate the flow and mass transfer in narrow membrane channels equipped with delta winglets, which are often used as longitudinal vortex generators to enhance heat transfer in heat exchanger applications. The channel consists of an impermeable solid wall and a membrane. The delta winglets are attached to the solidwall surface to enhance the mass transfer near themembrane surface and suppress the concentration polarization. Thewinglet performancewas evaluated in terms of concentration polarization factor versus consumed pumping power. Calculations were implemented for NaCl solution flow in a membrane channel having a height of 2.0 mmfor Reynolds numbers ranging from 400 to 1000. The delta winglets were optimized under equal pumping power condition, and the results of optimization suggest winglet height of 5/6 of the channel height, aspect ratio of 2.0, attack angle of 30°, and awinglet interval equal to the channel height. The optimal deltawingletswere comparedwith the optimal rectangular wingletswe found previously, and it is shown that the rectangular winglets yield a somewhat better performance than the delta winglets.

Key words: Membrane process, Concentration polarization, Mass transfer enhancement, Delta winglet, Pumping power

Jingchun Min, Bingqiang Zhang. Convective mass transfer enhancement in a membrane channel by delta winglets and their comparison with rectangular winglets[J]. Chinese Journal of Chemical Engineering, 2015, 23(11): 1755-1762.

Jingchun Min, Bingqiang Zhang. Convective mass transfer enhancement in a membrane channel by delta winglets and their comparison with rectangular winglets[J]. Chin.J.Chem.Eng., 2015, 23(11): 1755-1762.

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Convective mass transfer enhancement in a membrane channel by delta winglets and their comparison with rectangular winglets

Convective mass transfer enhancement in a membrane channel by delta winglets and their comparison with rectangular winglets

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