= (25 points) A cylinder pipe with a diameter of 20 cm and a length of 2 m has a constant surface temperature (Ts) = 130 C. This pipe is subjected to a cross flow of air with a velocity of 9 m/s at 25 C. The properties at the film temperature (T1 = 350 K): (v=20.92*10-6 m2/s, k =30*10-3 W/m.K, Pr = 0.707). 1. Determine the heat transfer rate. (15 pt) 2. How does increasing the thermal conductivity of the cylinder pipe affect the heat flux? (10 pt)