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Chapter 2- Research objectives and approaches The energy density of RFBs hinders the expansion of their large-scale applications. Flow maldistribution in RFBs is an important reason for non-uniform current density distribution, which affects the efficiency of RFB systems. Additionally, power consumption rate of electrolyte pumps is an energy sink. Therefore, the primary goal of this study is to develop an analytical approach to model the fluid dynamics in VRFB. It addresses the rarity of analytical knowledge to understand and improve the mentioned issues. Following objectives are defined to reach the overarching goal: Objective 1: Identifying a set of dimensionless numbers, important to experiment design for fluid dynamics in and scale-up of the RFBs. A dimensional analysis is performed on the fluid dynamics of the RFB. A set of dimensionless numbers are identified numbers to design and control experiments. The effect of each number on the overall pressure drop of RFB cells is investigated. Objective 2: Modeling the electrolyte flow dynamics in RFB cells with IFF and SFF designs and identifying the key parameters. Navier-Stokes and Darcy’s are the governing equations to describe the system. A scaling analysis is performed on these equations to identify key parameters. A hydraulic-electrical analogous model is obtained from the scaling analysis to model the electrolyte flow dynamics. Objective 3: Identifying the key parameters affecting flow maldistribution in IFFs and suggesting improvements. The hydraulic-electrical analogous model is utilized to predict the flow distribution in the parallel channels of IFF. Improvements to the flow distribution are proposed after the key parameters are identified by the model. 17PDF Image | Analysis of Fluid Flow in Redox Flow Batteries
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