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Analysis of Fluid Flow in Redox Flow Batteries

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Analysis of Fluid Flow in Redox Flow Batteries ( analysis-fluid-flow-redox-flow-batteries )

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Figure 3. 4. A Schematic of the geometry and the flow directions for channels in IFF, from the top and front view. The left white, right white, and grey area represent inlet channels, outlet channels, and rib between inlet and outlet channels, respectively. As Figure 1. 5 shows, Channels in IFF and SFF designs are not straight and bend many times to ensure electrolytes exposure to the electrodes. These bends cause pressure loss due to forcing fluid momentum change. These losses are called minor losses. Minor losses are stated in terms of equivalent length. Equivalent length of a minor loss is defined as the length of pipe of the same size as the minor loss, that would cause the same pressure drop as the minor loss. Table 3. 1 presents the equivalent length for minor losses in IFF and SFF designs. Length of channels is corrected by the equivalent length of each bend for pressure loss calculation in HEAM. Table 3. 1. The equivalent length for minor losses present in IFF and SFF [102] Minor losses 180 ̊ return bend 90 ̊ standard elbow Equivalent length (Leq/dh) 50 30 36

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