Reconsider Prob. 870. Using the EES (or other) software evaluate the effect of glycerin mass flow rate on the free-stream velocity of the hydrogen gas needed to keep the outlet mean temperature of the glycerin at 40C. By varying the mass flow rate of glycerin from 0.5 to 2.4 kg/s plot the free stream velocity of the hydrogen gas as a function of the mass flow rate of the glycerin. Problem. 870 Glycerin is being heated by flowing between two very thin parallel 1-m-wide and 10-m-long plates with 12.5-mm spacing. The glycerin enters the parallel plates with a temperature 20C and a mass flow rate of 0.7 kg/s . The outer surface of the parallel plates is subjected to hydrogen gas (an ideal gas 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 3 m/s and a temperature of 150C. Determine the outlet mean temperature of the glycerin the surface temperature of the parallel plates and the total rate of heat transfer. Evaluate the properties for glycerin at 30C and the properties of H2 gas at 100C. Are these good assumptions?
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