Liquid water is flowing between two very thin parallel 1-m-wide and 10-m-long plates with a spacing of 12.5 mm. The water enters the parallel plates at 20°C with a mass flow rate of 0.58 kg/s. The outer surface of the parallel plates is subjected to hydrogen gas (an ideal gas losses. at 1 atm) flow width-wise in parallel over the upper and lower surfaces of the two plates. The free-stream hydrogen gas has a velocity of 5 m/s at a temperature of 155°C. Determine the outlet mean temperature of the water, the surface temperature of the parallel plates, and the total rate of heat transfer. Evaluate the properties for water at 30°C and the properties of H2 gas at 100°C. Is this a good assumption?
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