The flow distribution including the magnitudes of pressure drop and velocity have been predicted through CFD simulations of flow through the graphite flow field attached to a compressed electrode. A 3-dimensional geometry of serpentine flow field as shown in Fig. 1 for the three cell areas was created using the design modeler of the CFD software ANSYS, version 18.1. Preliminary simulations were performed with various mesh sizes to establish grid independence. Mesh size of 0.25 mm was found to give grid-independent results and was therefore used for all simulations. A plane is drawn at mid-depths of flow-channel and porous electrode regions. Velocity and pressure contours have been obtained along these planes for an inlet flow rate 0.3 ml/min.cm2 and are shown in Figs. 46 for the cells of active area of 416, 918 and 1495 cm2. The cross-sectional area of inlet pipe is 12 mm2 in 416 cm2, 918 cm2 cells and 18 mm2 in the 1495 cm2 cell. For the operating flow rate mentioned above, the inlet velocities in the inlet pipe are 0.171 m/s, 0.381 m/s and 0.415 m/s for the small, medium and large cells respectively. Velocity profiles along the line drawn in width direction from inlet to outlet at the mid-depth of electrode and flow-channels are presented in the excel sheet 1.

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