Air at 2 atm and 200 c° is heated as it flow through a tube with diameter of 2.54 cm at velocity of 10 m/s .calculate the heat transfer per unit length of the tube if a constant heat flux condition is maintained at the wall and the wall temperature 20 c° above the air temperature , all along the length of the tube ,how much would the bulk temperature increase over a 3 m length of the tube. H= 2.57 x 10-5 kg/m s cp=1.025 kj/kg c°, k=0.0386 w/mc° %3D

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