Zimu Wang , Ruihang Su , Haoran Jiang , Tianshou Zhao
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引用次数: 0
Abstract
The under-rib convection, driven by the pressure differences between neighboring channels, plays a crucial role in determining the performance of flow-field structured vanadium redox flow batteries. However, the correlation between key geometric characteristics and under-rib convection is unclear, limiting the exploration of flow-related transport mechanisms and the development of high-performance flow fields. In this work, a three-dimensional model integrating fluid flow, mass transport, and electrochemical reactions is developed, and the under-rib convection is enhanced by tailoring the critical geometric characteristics adopting a rotary serpentine flow field as an example. Results show that variations in channel fraction and channel depth can mitigate concentration polarization by influencing the active material transport velocity within a localized region (i.e., under-rib convection intensity) without deteriorating the distribution of active material transport. More remarkably, the battery with the optimal geometric characteristics is able to deliver a preferable total pump-based efficiency (91.4 %) at a current density of 150 mA cm−2 and a flow rate of 40 ml min−1. This study offers a comprehensive analysis of the correlation between flow field geometric characteristics and under-rib convection to serve as guidance for the design of high-performance vanadium redox flow batteries.
由相邻通道之间的压力差驱动的肋下对流在决定流场结构钒氧化还原液流电池的性能方面起着至关重要的作用。然而,关键几何特征与肋下对流之间的相关性尚不清楚,这限制了与流动相关的传输机制的探索和高性能流场的开发。本研究以旋转蛇形流场为例,建立了一个集流体流动、质量传输和电化学反应于一体的三维模型,并通过调整关键几何特征增强了肋下对流。结果表明,通道分数和通道深度的变化可以通过影响局部区域内的活性物质传输速度(即肋下对流强度)来缓解浓度极化,而不会恶化活性物质传输的分布。更值得注意的是,在电流密度为 150 mA cm-2 和流速为 40 ml min-1 的条件下,具有最佳几何特性的电池能够提供更佳的泵式总效率(91.4%)。这项研究全面分析了流场几何特征与肋下对流之间的相关性,为设计高性能钒氧化还原液流电池提供了指导。
期刊介绍:
International Journal of Heat and Mass Transfer is the vehicle for the exchange of basic ideas in heat and mass transfer between research workers and engineers throughout the world. It focuses on both analytical and experimental research, with an emphasis on contributions which increase the basic understanding of transfer processes and their application to engineering problems.
Topics include:
-New methods of measuring and/or correlating transport-property data
-Energy engineering
-Environmental applications of heat and/or mass transfer