In an industrial process, products of combustion at a temperature and pressure of 2000 K and 1 atm, respectively, flow through a long, 0.25-m-diameter pipe whose inner surface is black. The combustion gas contains CO2 and water vapor each at a partial pressure of 0.10 atm. The gas may be assumed to have the thermo physical properties of atmospheric air and to be in fully developed flow with m = 0.25 kg/s. The pipe is cooled by passing water in cross flow over its outer surface. The upstream velocity and temperature of the water are 0.30 m/s and 300 K. respectively. Determine the pipe wall temperature and heat flux.