Numerical study of fluid behaviors in fibrous porous electrodes and optimization of electrode structure using lattice Boltzmann simulation

Name: Tanaka, Daiki

Organization : Osaka University. Department of Mechanical Engineering

Email : tanaka_d@ene.mech.eng.osaka-u.ac.jp

Name: Suzuki, Takahiro

Organization : Osaka University. Department of Mechanical Engineering

Name: Tsushima, Shohji

Organization : Osaka University. Department of Mechanical Engineering

keyword: Lattice Boltzmann method

; Fibrous media

; Electrochemical Reaction

; Transport Processes

Abstract: Decarbonization has become an international challenge, especially in the power sector, where a massive introduction of renewable energy is urgently needed. Solar and wind power, in general, require the use of large-scale energy storage systems for leveling their fluctuating nature of power generation. Vanadium redox flow batteries (VRFBs) are promising devices for large-scale energy storage systems. The engineered design of the fibrous electrodes and the embedded flow fields in VRFBs is a crucial factor that enhances charge and discharge efficiency. In this study, we developed a three-dimensional mathematical model based on the lattice Boltzmann method to calculate the flow, concentration, and potential fields in carbon fiber electrodes. Lattice Boltzmann simulations were developed that fully consider activation, ohmic, and concentration overpotentials with variation of open circuit potential attributed to local reactant concentration. LBM simulation showed that the vanadium ion was inhomogeneously consumed due to both penetration and stagnation behaviors of the supplying electrolyte in the porous electrodes, resulting in the overvoltage of VRFBs. The LBM model was also utilized to compare the effects of electrode structure on irreversibility loss of energy in VRFBs for pore-scale optimization of the fibrous electrodes

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2024

Modified: 2024-12-18

Issued: 2024-12-18

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BibliograpyCitation : In Thai Society of Mechanical Engineers (TSME) and Chiang Mai University. The 13th TSME International Conference on Mechanical Engineering (TSME-ICoME 2023) (pp.778-784). Chiang Mai : Chiang Mai University, 2023

eng

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