Axial Temperature Behavior of a Heat Exchanger Tube for Microwave Thermal Rockets

A = channel cross sectional area cp T = specific heat at constant pressure D = channel diameter H T = convective heat transfer coefficient k T = fluid thermal conductivity l = channel length _ m = mass flow rate Nu = Nusselt number P = inner channel perimeter Pr = Prandtl number q00 convection = convective heat flux q00 radiation = radiation heat flux qtube = heat rate Re = Reynolds number Tm = mean fluid temperature Tw = wall temperature T1 = ambient temperature um = mean fluid velocity = emissivity T = viscosity = density = Stephan–Boltzmann constant