Question

An electric resistance heater is embedded in a long cylinder of diameter 30 mm. When
water with a temperature of 25 ◦C and velocity of 1 m/s flows crosswise over the cylinder,
the power per unit length required to maintain the surface at a uniform temperature of
90 ◦C is 28 kW/m. When air, also at 25 ◦C, but with a velocity of 10 m/s is flowing, the
power per unit length required to maintain the same surface temperature is 400 W/m.
Calculate and compare the convection coefficients for the flows of water and air.

Answer 1

Answer:

34 surface and kw 100area surfaceok thi se my answers also right answer ok