Full Text:   <290>

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Suppl. Mater.: 

CLC number: TQ021.4

On-line Access: 2019-08-05

Received: 2019-05-07

Revision Accepted: 2019-07-05

Crosschecked: 2019-07-16

Cited: 0

Clicked: 591

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Qing-ran Kong

https://orcid.org/0000-0002-0749-9161

Bao-ku Zhu

https://orcid.org/0000-0002-3221-181X

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Journal of Zhejiang University SCIENCE A 2019 Vol.20 No.8 P.601-613

http://doi.org/10.1631/jzus.A1900181


Mass transfer enhancement of hollow fiber membrane deoxygenation by Dean vortices


Author(s):  Qing-ran Kong, Yi-zhen Zhang, Hua Tian, Li-feng Fang, Ming-yong Zhou, Li-ping Zhu, Bao-ku Zhu

Affiliation(s):  Key Laboratory of Macromolecule Synthesis and Functionalization (Ministry of Education), Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, ERC of Membrane and Water Treatment (Ministry of Education), Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   zhubk@zju.edu.cn

Key Words:  Mass transfer, Hollow fiber membrane, Water deoxygenation, Dean vortices


Qing-ran Kong, Yi-zhen Zhang, Hua Tian, Li-feng Fang, Ming-yong Zhou, Li-ping Zhu, Bao-ku Zhu. Mass transfer enhancement of hollow fiber membrane deoxygenation by Dean vortices[J]. Journal of Zhejiang University Science A, 2019, 20(8): 601-613.

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author="Qing-ran Kong, Yi-zhen Zhang, Hua Tian, Li-feng Fang, Ming-yong Zhou, Li-ping Zhu, Bao-ku Zhu",
journal="Journal of Zhejiang University Science A",
volume="20",
number="8",
pages="601-613",
year="2019",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1900181"
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%T Mass transfer enhancement of hollow fiber membrane deoxygenation by Dean vortices
%A Qing-ran Kong
%A Yi-zhen Zhang
%A Hua Tian
%A Li-feng Fang
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%A Li-ping Zhu
%A Bao-ku Zhu
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%D 2019
%I Zhejiang University Press & Springer
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T1 - Mass transfer enhancement of hollow fiber membrane deoxygenation by Dean vortices
A1 - Qing-ran Kong
A1 - Yi-zhen Zhang
A1 - Hua Tian
A1 - Li-feng Fang
A1 - Ming-yong Zhou
A1 - Li-ping Zhu
A1 - Bao-ku Zhu
J0 - Journal of Zhejiang University Science A
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DOI - 10.1631/jzus.A1900181


Abstract: 
This paper reports a modeling and experimental study of the mass transfer enhancement of water deoxygenation by using a helical hollow fiber membrane (HHFM) to enable dean vortices. Experiments demonstrated that the HHFM deoxygenating rate was doubled compared with straight hollow fiber deoxygenation. A new model to describe the HHFM deoxygenation mass transfer was derived combining the helical coordinate system mass continuity equation on the lumen side and a modified dusty gas model for the mutual gaseous diffusion in the porous membrane. The model simulation showed that dean vortices induce transverse fluid disturbance in the fiber, which significantly promotes lumen side mass transfer. The key parameters influencing the strength of dean vortices are the Reynolds number of the lumen side and the curvature of HHFM. Operating and membrane structure parameters were optimized for HHFM deoxygenation design. The new model could be employed to describe quantitatively the mass transfer behavior of all types of HHFM gas-phase separation processes.

The manuscript describes the effect of coiled hollow fiber membranes with respect to lumen side mass transport enhancement, governed by dean Vortices. In this work, mutual gas transfer is considered, including oxygen, nitrogen and water, including their transport through the porous membrane. Experimental results are compared against a numerical model that is based on a velocity equation and a modified dusty gas model. This makes the approach computationally extensive. I do like the attempt and support a paper on this topic. I believe the authors have rightfully opted for using a velocity description, instead of solving complete navier stokes.

中空纤维膜脱氧过程中 Dean 涡强化传质研究

目的:在螺旋中空纤维膜脱氧过程中引入了Dean涡,与线型中空纤维膜脱氧过程相比传质速率显著提升. 本文旨在建立新的螺旋中空纤维膜脱氧过程传质模型,探讨管程流体雷诺数、中空纤维膜结构参数、壳程真空度和操作温度对Dean涡强化传质效果的影响,并优化螺旋中空纤维膜脱氧过程操作参数.
创新点:1. 建立新的螺旋中空纤维膜脱氧过程传质模型; 2. 该传质模型可以应用于任何螺旋中空纤维膜气-液过程的传质行为描述.
方法:1. 实验研究管程流体雷诺数、中空纤维膜结构参数、壳程真空度和操作温度对Dean涡强化传质效果的影响,并与线型中空纤维膜传质进行对比. 2. 利用螺旋坐标系下的质量连续性方程以及Dean涡的摄动解描述管程溶质的传质行为; 利用改进的尘气模型描述膜孔道内多组份气体的扩散行为; 耦合建立新的螺旋中空纤维膜脱氧过程传质模型,并与实验结果进行比较. 3. 模拟脱氧过程的氧、氮、水三种组分的浓度分布,优化螺旋中空纤维膜脱氧过程的膜结构参数和操作参数.
结论:1. 实验和模拟结果均证实Dean涡可以有效提升脱氧传质速率,最大传质增强因子为2.2. 2. Dean涡主要受到管程雷诺数和中空纤维膜曲率的影响; 当管程雷诺数较大时,中空纤维膜即使存在很小的曲率,传质的速率也有显著的提升.

关键词:传质; 中空纤维膜; 水脱氧; Dean涡

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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