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- Title
Effect of Serpentine Flow Field Channel Dimensions and Electrode Intrusion on Flow Hydrodynamics in an All-Iron Redox Flow Battery.
- Authors
Krishnappa, Rakesh Basavegowda; Subramanya, S. Gowreesh; Deshpande, Abhijit; Chakravarthi, Bharatesh
- Abstract
This paper presents a study on flow hydrodynamics for single-channel serpentine flow field (SCSFF) and cross-split serpentine flow field configurations (CSSFF) for different geometric dimensions of channel and rib width ratios with electrode intrusion over varying compression ratios (CRs) in an all-iron redox flow battery. Pressure drops (Δ p) measured experimentally across a cell active area of 131 cm2 for different electrolyte flow rates were numerically validated. A computational fluid dynamics study was conducted for detailed flow analyses, velocity magnitude contours, flow distribution, and uniformity index for the intrusion effect of a graphite felt electrode bearing a thickness of 6 mm with a channel compressed to varying percentages of 50%, 60%, and 70%. Experimental pressure drops (Δ p) over the numerical value resulted in the maximum error approximated to 4%, showing good agreement. It was also reported that the modified version of the cross-split serpentine flow field, model D, had the lowest pressure drop, Δ p , of 2223.4 pa, with a maximum uniformity index at the electrode midplane of 0.827 for CR 50%, across the active cell area. The pressure drop (Δ p) was predominantly higher for increased compression ratios, wherein intrusion phenomena led to changes in electrochemical activity; it was found that the velocity distribution was quite uniform for a volumetric uniformity index greater than 80% in the felt.
- Subjects
FLOW batteries; HYDRODYNAMICS; SERPENTINE; CHANNEL flow; PRESSURE drop (Fluid dynamics); SOLID state batteries; ELECTRIC batteries
- Publication
Fluids, 2023, Vol 8, Issue 8, p237
- ISSN
2311-5521
- Publication type
Article
- DOI
10.3390/fluids8080237