Question: = = (25 points) A cylinder pipe with a diameter of 30 cm and a length of 4 m has a constant surface temperature (Ts)

= = (25 points) A cylinder pipe with a diameter of 30 cm and a length of 4 m has a constant surface temperature (Ts) = 130 C. This pipe is subjected to a cross flow of air with a velocity of 5 m/s at 25 C. The properties at the film temperature (T1 = 350 K): (v= 20.92*10-6 m/s, k =30*10-3 W/m.K, Pr = 0.707) 1. Determine the heat transfer rate. (15 pt) 2. How does increasing the length of the cylinder affect the heat rate? (10 pt)

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