电渗析
堆栈(抽象数据类型)
限制电流
机械
无量纲量
入口
流量(数学)
电流(流体)
流利
压力降
体积流量
计算流体力学
反向电渗析
经销商
材料科学
流体力学
工程类
机械工程
膜
化学
电气工程
计算机科学
物理
生物化学
电极
物理化学
电化学
程序设计语言
作者
Jack Ledingham,Kyra Campbell,Ben in ’t Veen,Lucas Keyzer,Alasdair N. Campbell
出处
期刊:Desalination
[Elsevier]
日期:2022-06-01
卷期号:531: 115691-115691
被引量:6
标识
DOI:10.1016/j.desal.2022.115691
摘要
Electrodialysis is an emerging low-energy membrane-based water-treatment technology with strong potential for industrial use. However, various engineering challenges have prevented widespread utilisation. The flow maldistribution in electrodialysis has been evaluated through computational fluid dynamics simulations in Ansys Fluent. A typical lab-scale stack geometry with ten cell pairs was simulated, and significant flow non-uniformity was found. An analytical model showed good agreement with simulations and was used to quantify the maldistribution through a single dimensionless number. The inlet flow rate and stack geometry were varied to investigate the distribution of flow. Maldistribution was exacerbated when the inlet flow rate, channel width, distributor angle, or number of cell pairs was increased. Further, the effect of maldistribution on the limiting current density (LCD) and stack resistance was evaluated using a one-dimensional model. Maldistribution was found to significantly impact the LCD, with a reduction of 23% found for the typical geometry relative to uniformly distributed flow. The resistance was impacted much less, showing an increase in resistance of only 2%. This highlights that maldistribution is a localised issue rather than a global one and goes some way to explaining why there has been a distinct lack of research into flow maldistribution in electrodialysis.
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