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3.8.4.3- The height of the channels As Figure 3. 24 demonstrates, the predicted pressure drop decreases with the increase in the height of the channels for every FF and electrode design. It is due to the increase in the hydraulic diameter of the channels; hence, the fluid has more space to flow through. Additionally, as Equation 3.30 suggests, higher ratio of channel height and width leads to lower C-values. Therefore, it is expected for the C-value to intensify the observed trend between the height of the channels and the pressure drop. 3.8.4.4- The width of the ribs Figure 3. 25 demonstrates the pressure drop for different FFs and electrodes with various ribs width. It is assumed that the active area of the RFB cells is the same in each case, therefore, the summation of channels and ribs width remains the same (2 mm). As Figure 3. 25 suggests, the predicted pressure drop increases with the increase in the width of the ribs for every FF and electrode design. This result is justified by the decrease in the hydraulic diameter of the channels and the increase in the length that the flow is required to jump over the ribs. Additionally, as Equation 3.30 suggests, higher ratio of channel width and height leads to higher C-values. Therefore, it is expected for the C-value to intensify the observed trend between the width of the ribs and the pressure drop. Through these analyses, Objective 1 is obtained. 65PDF Image | Analysis of Fluid Flow in Redox Flow Batteries
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