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An electric resistance heater is embedded in a long cylinder of diameter 30 mm. when water with a temperature of 25â°c and velocity 1 m/s flows crosswise over the cylinder, the power per unit length required to maintain the surface at a uniform temperature of 80â°c is 38 kw/m. when air, also at 25â°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. assume unit length. calculate and compare the convection coefficients for the flows of water and air. according to your calculations, which is a better convective heat transfer media, air or water?
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An electric resistance heater is embedded in a long cylinder of diameter 30 mm. when water with a te...
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