Joey Vei, Choo Er and Ng, Khai Ching and Chong, Yie Kai and Tan, Jia Xin and Lau, Woei Jye and Liang, Y. Y. (2024) Impacts of shaft on mass transfer in a reverse osmosis rotating disk membrane. Journal of Membrane Science and Research (JMSR), 10 (4). pp. 1-7. ISSN 2476-5406. (Published)
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Abstract
A rotating disk has been proposed for integration within the membrane module due to its ability to induce shear near the membrane. This study focuses on the hydrodynamics and mass transfer simulation of a reverse osmosis (RO) rotating disk membrane system using three-dimensional computational fluid dynamics techniques. The mass transfer coefficient (k ̅_(mt,ave)), wall shear (γ ̅_(,ave)) and water flux ((J ̅_(,ave)) show significant deviations of at least double between cases with and without a shaft (at high disk rotational speed). This is because at a higher disk rotational speed, the flow for the case with shaft experiences a more uniform and exhibits circular velocity pathline caused by the high-speed circulating shaft, whereas a more non-uniform flow is obtained for the case without shaft. The significance of non-uniform flow lies in its ability to enhance the flow perpendicular to the membrane surface. This enhancement is evidenced by the stronger turbulent kinetic energy observed near the membrane surface when the shaft is absent especially at a higher disk rotational speed. The results also indicate that rotational direction (clockwise vs. anticlockwise) does not significantly impact γ ̅_(,ave), k ̅_(mt,ave) and J ̅_(,ave). Regarding the geometrical effect, it was found that reducing the gap between the membrane interface layer and the impeller decreases the size of the quiescent region near the membrane surface. This reduction results in stronger mixing near the membrane, which enhances mass transfer and increases water flux.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Rotating disk; Shaft; Reverse osmosis; Stirring; Mass transfer; Wall shear stress |
| Subjects: | T Technology > TP Chemical technology |
| Faculty/Division: | Institute of Postgraduate Studies Faculty of Chemical and Process Engineering Technology Centre for Research in Advanced Fluid & Processes (Fluid Centre) |
| Depositing User: | Mrs Norsaini Abdul Samat |
| Date Deposited: | 21 Oct 2024 03:58 |
| Last Modified: | 21 Oct 2024 04:00 |
| URI: | http://umpir.ump.edu.my/id/eprint/42832 |
| Download Statistic: | View Download Statistics |
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