Air at 40 C flows over a long, 25-mm-diameter cylinder
Chapter , Problem 1.19(choose chapter or problem)
Air at 40 C flows over a long, 25-mm-diameter cylinder with an embedded electrical heater. In a series of tests, measurements were made of the power per unit length, P , required to maintain the cylinder surface temperature at 300 C for different free stream velocities V of the air. The results are as follows: Air velocity, V (m/s) 1 2 4 8 12 Power, P (W/m) 450 658 983 1507 1963 (a) Determine the convection coefficient for each velocity, and display your results graphically. (b) Assuming the dependence of the convection coeffi- cient on the velocity to be of the form h CVn , determine the parameters C and n from the results of part (a).
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