LOOOOOOO 820 Atmospheric air at 250 K and a free stream velocity 32 m/s flows across (a) a circular cylinder and (b) a s

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Looooooo 820 Atmospheric Air At 250 K And A Free Stream Velocity 32 M S Flows Across A A Circular Cylinder And B A S 1 (68.41 KiB) Viewed 48 times

LOOOOOOO 820 Atmospheric air at 250 K and a free stream velocity 32 m/s flows across (a) a circular cylinder and (b) a sphere, each of diameter 2.5 cm. The surface of each is maintained at a uniform temperature of 350 K. You may use Whitaker's correlations 0.25 и Num = (0.4 Re0.5 + 0.06 Re2/3) P0.4 for cylinder 0.25 Num = 2 + (0.4 Re0.5 + 0.06 Re23) Pr0.4 for sphere Calculate for each (i) the average heat transfer coefficient, (ii) the heat transfer rate per metre length of cylinder, and the sphere and (iii) the drag force acting per metre length of the cylinder. Properties of air at 300 K are, k = 0.0262 W/mK, V = 16.84 x 10-6 m2/s, Pr = 0.708, u = 1.983 x 10-5 kg/ms and p = 1.177 kg/m² o video