Air at 20C flows over a 4-m-long and 3-m-wide surface of a plate whose temperature is 80C

Question:

Air at 20°C flows over a 4-m-long and 3-m-wide surface of a plate whose temperature is 80°C with a velocity of 5 m/s. The rate of heat transfer from the surface is
(a) 7383 W

(b) 8985 W

(c) 11,231 W

(d) 14,672 W

(e) 20,402 W
(For air, use k = 0.02735 W/m.K, Pr = 0.7228, v = 1.798 × 10-5 m2/s)

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