Air at 2 bar pressure and 400 K temperature flows through a smooth pipe. The inner diameter of the tube is 3.5 cm. At a location where the air mass flux is 7.0 kg/m 2 ·s, air is injected into the pipe...

Air at 2 bar pressure and 400 K temperature flows through a smooth pipe. The inner diameter of the tube is 3.5 cm. At a location where the air mass flux is 7.0 kg/m²·s, air is injected into the pipe through a porous wall at the rate of 0.004 kg/m²
·s. The wall surface temperature is 450°C. Calculate the friction factor and heat transfer coefficient.