Atmospheric air flows inside a heated thin - walled 25 mm diameter tube with a velocity of 0.5 m / s . Heating can be do

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Atmospheric air flows inside a heated thin - walled 25
mm diameter tube with a velocity of 0.5 m / s . Heating can be done
either by condensing steam on the outer surface of the tube , thus
mainshining a uniform surface temperature , or by electric
resistance heating , thus maintaining a uniform surface heat flux .
Calculate the heat transfer coefficient for both of these heating
conditions . Assume air properties of 350 K given as : v = 20.76 x
106 m² / s and k = 0.03 W / mK and the flow as hydrodynamically and
thermally developed .