Flow Cell Characterisation: Flow Visualisation, Pressure Drop and Mass Transport at 2D Electrodes in a Rectangular Channel
Flow Cell Characterisation: Flow Visualisation, Pressure Drop and Mass Transport at 2D Electrodes in a Rectangular Channel
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DOI：
10.1149/1945-7111/ab7b49
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发表时间：
2020-03-12
影响因子：
3.9
通讯作者：
Walsh, F. C.
中科院分区：
文献类型：
--
作者：
Wu, L.;Arenas, L. F.;Walsh, F. C.
为了证明在新的商业实验室规模流动池中表征反应环境的重要性和便利性，在C-Flow（R）Lab 5 x 5池中研究了流体流量、压降和空间平均传质系数。使用了在矩形通道中具有光滑平面电极的流过式配置。电解质的平均线速度为2至10厘米秒（-1）过去的电极表面和通道雷诺数为53至265被认为是。评估了在工作电极旁边的湍流促进器的效果。通过定性流动可视化研究探索了流量分布，而压降的相关性通过测量流道和整个电池作为平均线速度的函数来显示。通过极限电流量化电化学性能，从而可以确定相同流速范围内电极处的质量传递系数。从电化学活塞流反应器设计方程预测了间歇再循环模式下的反应物转化率和归一化空速。结果进行了比较，以及在文献中发现的特征电化学流动反应器。强调了表征技术和基本反应器模型在新工艺开发过程中的重要性。(C)2020年电化学学会（“ECS”）。由IOP出版有限公司代表ECS出版。
Aiming to demonstrate the importance and facility of characterising the reaction environment in new commercial laboratory-scale flow cells, fluid flow, pressure drop and space averaged mass transport coefficient were studied in the C-Flow (R) Lab 5 x 5 cell. A flow-by configuration with smooth, planar electrodes in a rectangular channel was used. Electrolyte mean linear velocities of 2 to 10 cm s(-1) past the electrode surface and channel Reynolds numbers of 53 to 265 were considered. The effect of a turbulence promoter next to the working electrode was evaluated. Flow distribution was explored by a qualitative flow visualization study, while the relevance of pressure drop was shown by measurements over the flow channel and the whole cell as a function of mean linear velocity. The electrochemical performance was quantified from the limiting current, permitting the determination of the mass transport coefficient at the electrodes over the same range of flow rates. Reactant conversion in the batch recirculation mode and normalised space velocity were predicted from the electrochemical plug flow reactor design equation. Results were compared to well-characterised electrochemical flow reactors found in the literature. The significance of characterisation techniques and basic reactor models during the development of new processes is emphasised. (C) 2020 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.