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1.9 mm- 6 parallel channels, Black: 1.59 mm× 1.9 mm- 4 parallel channels) Both models predict a false trend for the change in pressure drop with different channel area. ................................... 55 Figure 3. 18. Normalized flow distribution for the 0.25 mm wide channels IFF in Aziz article [38]. The improvements for each case are a. Changing the manifold width from 0.25 mm to 0.5 mm. b. Compression of the electrode where its permeability and thickness decreases to 1×10-11 m2 and 0.143 mm, respectively. c. 15 cm long channels instead of 19 cm long channels. d. the width of the ribs and channels change from 0.79 mm and 0.25 mm to 0.85 mm and 0.19 mm, respectively. In all cases, the projected flow distribution is improved. ............................................................. 57 Figure 3. 19. Comparison of the pressure drop for different flow field designs with the same active and channel cross-sectional area. The HEAM predicts that the pressure drop of RFBs with IFF design is lower than the similar with SSFF and MSFF designs. .................................................. 58 Figure 3. 20. Comparison of the pressure drop for different flow field designs with the same active and channel cross-sectional area for the data from Messaggi’s article. [43] This plot suggests pressure drop along RFBs with IFF is lower than the similar with SSFF. ................................... 59 Figure 3. 21. The pressure drop for different electrodes utilized at the same flow fields in their corresponding Reynolds number range. It is evident that in all cases, cells utilizing carbon paper require more pressure drop for the cell to operate. ....................................................................... 62 Figure 3. 22. The pressure drop for different flow fields utilizing the same electrode in their corresponding Reynolds number range. The pressure drop at all the flow fields utilizing carbon felts are comparable to each other at the same Reynolds number, however, it seems IFFs and 3SFFs cause less pressure drop at the same Reynolds number compared to SSFF................................. 63 Figure 3. 23. The pressure drop for different flow fields and electrodes with compression ratio of 10%, 20%, 30%, 40% and 50%. Except for the IFF-CP case, all cases are indifferent to the viiPDF Image | Analysis of Fluid Flow in Redox Flow Batteries
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