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CFD Investigation of Near-Membrane Slippery Condition Effects on Water/Salt Transport in a Reverse Osmosis Feed Channel
Arabian Journal for Science and Engineering ( IF 2.9 ) Pub Date : 2021-01-23 , DOI: 10.1007/s13369-020-05198-8
Morteza Taherinejad , Alireza Afrouzan , Shahram Derakhshan

In many membrane-based water treatment methods, because of consistent salt fouling on the membranes of the narrow feed channel, studying methods of improving the fluid flow and mass transfer of the membrane element is vitally important. Providing a slippery situation for the fluid adjacent to the membrane can result in concentrated fluid movement and system operation improvement. In this research, the effects of various magnitude of slip velocities on the important parameters of membrane feed channel operation at the wide range of Reynolds numbers have been investigated. To this end, CFD has been implemented and the continuity, Navier–Stokes, and mass transfer equations in a 2D narrow channel have been solved. Two cases with and without slip velocity have been compared comprehensively in the wide range of Reynolds numbers from 100 to 2100. Also, the influence of fluid properties variations with the salt concentration on output results has been studied. Due to the induced slip velocity, the results demonstrate a decline of about 5–12% in concentration polarization, an increase of 20–60% in Sherwood number, a decrease of 5–13% in friction factor, and an increase of 0.5–1.5% in permeation flux.



中文翻译:

反渗透进料通道中近膜滑移条件对水/盐传输的影响的CFD研究

在许多基于膜的水处理方法中,由于狭窄进料通道的膜上始终存在盐垢,因此研究改善膜元件的流体流动和传质的方法至关重要。为与膜相邻的流体提供打滑的状况可以导致集中的流体运动和系统操作的改善。在这项研究中,已经研究了在大范围的雷诺数下,各种滑动速度对膜进料通道操作的重要参数的影响。为此,已经实施了CFD,并解决了二维窄通道中的连续性,Navier-Stokes和传质方程。在从100到2100的雷诺数范围内,已经对两个有和没有滑动速度的情况进行了全面的比较。研究了流体性质随盐浓度变化对产出结果的影响。由于感应滑移速度,结果表明浓度极化下降约5-12%,Sherwood数增加20-60%,摩擦系数减少5-13%,并且增加0.5-渗透通量为1.5%。

更新日期:2021-01-24
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