Bipolar Plate Stack with Anode Radial Flow Field

2. Bipolar plates Plate geometry Circular bipolar plate. Outside diameter: 116 mm Active region diameter: 100 mm Membrane outside diameter: 120 mm Membrane sealing width: 8 mm Active membrane region begins at an inner diameter of 20 mm. This leaves a stated 5 mm sealing area. Active outer diameter: 100 mm A 30° section is cut out/unused from the active membrane region. Resulting active area: approximately 69.1 cm² per cell. Titanium For the PoC: Bipolar plate material: Grade 5 titanium Starting stock: 500 × 500 mm Starting thickness: 5 mm One 500 × 500 mm plate produced: 14 bipolar plates 2 monopolar end plates Therefore, one starting sheet supplied enough plates for a 15-cell stack. Flow-field channels Anode side: Radially outward flow-field architecture. Central water feed. Channels distributed around the circular plate. Angular channel spacing: 15° Nominal theoretical number of radial outlet channels: 24 A 30° section is reserved for the hydrogen outlet. Final number of outlet channels: 22 Initial channel depth: 0.5 mm Estimated channel width: approximately 1 mm Titanium machining cutter: 0.75 mm Minimum calculated feed-hole diameter from the stated circumference calculation: 7.64 mm Actual selected central water-feed-hole diameter: 10 mm The design is described as interdigitated. The later/current design differs from the original concept: Outlet channels are shortened. They function more like outlet ports. They begin approximately where the inlet channels terminate. Outlet sections have a 7.5° offset relative to the corresponding inlet geometry. Outlet-section spacing remains 15°. Geometry that cannot be reconstructed from the text The article does not state: Exact radial channel centerlines. Exact radial starting/ending radii. Exact channel width for the manufactured plate. Exact land widths. Exact channel corner geometry. Exact depth profile beyond the stated initial 0.5 mm. Exact central-feed transition geometry. Exact 22-channel angular layout relative to the 30° cutout. Exact outlet-port dimensions. Those need to come from Figure 3/CAD files or supplementary information rather than being invented.

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