Consider the velocity and temperature profiles for air- flow in a tube with diameter of 8 cm can be expressed as 11(r) = 0.21(1-(r/r)21 tr) = 250 + 200( r/r)3 with units in m/s and k, respectively. if the convection heat transfer coefficient is 100 w/m2.k, determine the mass flow rate and surface heat flux using the given velocity and tem- perature profiles. evaluate the air properties at 20°c and 1 atm. properties the density of 1 atm air at 20°c is p-1.204 kg/m