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Euler number is the dimensionless number representing the pressure drop. However, plotting it does not give valuable visual information due to the presence of velocity components in its denominator. Therefore, the pressure drop is presented as the dependent variable in the upcoming figures. 3.8.4.1- The Reynolds number As Figure 3. 21 demonstrates, RFB cells utilizing carbon paper cause more pressure drop than RFB cells using carbon felts. This result is consistent with different Reynolds numbers and FFs. It is justified as the permeability and porosity of the carbon paper is less than the carbon felt, therefore, diffusing in the carbon paper requires more hydraulic pressure than the carbon felts. Additionally, the maximum Reynolds number in the channels for all the FFs is 700, far from the transition region, which starts at Reynolds number of 2100. It is another evidence for the strength of assuming laminar flow in the channels of the cells. Figure 3. 22 illustrates the pressure drop for different flow fields utilizing the same electrode. RFB cells with carbon felts seems to have the same trendline, as different FFs have comparable pressure drop values at the same Reynolds number. However, RFB cells with SSFF are predicted to have different trendline than the ones with IFFs or 3SFFs utilizing carbon paper. This plot implies that in case of having a threshold for the Reynolds number while designing an RFB system, IFFs and MSFFs require lower pump workload than SSFFs to operate. 3.8.4.2- The electrode permeability Figure 3. 23 demonstrates the predicted pressure drop for different FFs and electrodes with various electrode compression ratios (CRs- from 10% to 50%). All the setups, except for IFF-CP case, do not expect notable changes in their pressure drop while compressed. It shows that the CR effects 60PDF Image | Analysis of Fluid Flow in Redox Flow Batteries
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