Understanding and enhancing the under-rib convection for flow-field structured vanadium redox flow batteries

Wang，Zimu1; Su，Ruihang2; Jiang，Haoran2; Zhao，Tianshou1,3

2024-09-15

10.1016/j.ijheatmasstransfer.2024.125789

International Journal of Heat and Mass Transfer   影响因子和分区

0017-9310

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 and a flow rate of 40 ml min. 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.

Energy efficiency Flow battery Flow field Mass transfer Under-rib convection

SCI ; EI

英语

其他

20242316219201

Energy efficiency ; Flow batteries ; Flow fields ; Geometry ; Serpentine ; Transport properties ; Vanadium

Minerals:482.2 ; Energy Conservation:525.2 ; Vanadium and Alloys:543.6 ; Fluid Flow, General:631.1 ; Mass Transfer:641.3 ; Secondary Batteries:702.1.2 ; Mathematics:921 ; Physical Properties of Gases, Liquids and Solids:931.2

ENGINEERING

2-s2.0-85195216127

Scopus

1.Department of Mechanical and Aerospace Engineering,The Hong Kong University of Science and Technology,Hong Kong,Hong Kong
2.Department of Energy and Power Engineering,Tianjin University,Tianjin,China
3.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,China

Wang，Zimu,Su，Ruihang,Jiang，Haoran,et al. Understanding and enhancing the under-rib convection for flow-field structured vanadium redox flow batteries[J]. International Journal of Heat and Mass Transfer,2024,230.

Wang，Zimu,Su，Ruihang,Jiang，Haoran,&Zhao，Tianshou.(2024).Understanding and enhancing the under-rib convection for flow-field structured vanadium redox flow batteries.International Journal of Heat and Mass Transfer,230.

Wang，Zimu,et al."Understanding and enhancing the under-rib convection for flow-field structured vanadium redox flow batteries".International Journal of Heat and Mass Transfer 230(2024).