Problem
How much total heat per second can be absorbed in a thrust chamber with an inside wall surface area of 0.200 m2 if the coolant is liquid hydrogen and the coolant temperature does not exceed 145 K in the jacket? Coolant flows at 2 kg/sec. What is the average heat transfer rate per second per unit area? Use the following data:
Heat of vaporization near boiling point 446 kJ/kg
Thermal conductivity (gas at 21 K) 0.013 W/m-K
(gas at 194.75 K) 0.128 W/m-K
(gas at 273.15 K) 0.165 W/m-K