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Section 5.3 FEA simulations 5.3 FEA simulations With the electrode dimensions, according to Table 5-1, the design process using the FEA is carried out. Channel geometry is varied in length and width. Channel length is governed by the meander count. Between the two manifolds, as much space as possible is used to place the channel, but some space has to be reserved for manufacturing reasons and gaskets. The basic channel geometry comprises one and a half meanders and is shown in Figure 5-3. An extra meander is added to the extended channel, as shown in Figure 5-4. For each of the four different electrode areas and each of the two meander counts, three different channel widths are studied. For each cell design, the geometry factor is derived as described in Eq. (2-35) on page 29. Total pressure drop across the cell (inlet channel, inlet funnel, graphite felt, outlet funnel and outlet channel) is evaluated for two different flow rates in order to derive the parameters according to Eq. (2-80) on page 51. In total, twenty-four different designs are generated, as shown in Table 5-3. The presented approach yields a realistic set of input parameters for the design process. The geometry factor of the designs as well as the pressure drop at maximum applied flow rate are within reasonable ranges. Figure 5-3: Channel design with 1.5 meanders Figure 5-4: Channel design with 2.5 meanders To facilitate presenting the results in the next sections, the different designs are indexed with a pair of numbers, separated by a decimal point. The first number refers to the electrode area. When multiplied by a factor of 1,000, it gives the electrode area of the respective design in cm2. The second number refers to the channel design variation. The 81PDF Image | Model-based Design Vanadium Redox Flow Batteries
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