Question: An electric resistance heater is embedded in a long cylinder of diameter 30 mm. When water with a temperature of 25C and velocity of 1

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 1m. Calculate and compare the convection coefficients for the flows of water and air.

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