An electric resistance heater is embedded in a long cylinder of diameter 30mm. When water with a temperature of 25 C and velocity of 1m/s flows crosswise over the cylinder, the power per unit length required to maintain the surface at a uniform temperature of 90 C is 28kW/m. When air, also at 25 C, but with a velocity of 10m/s is flowing, the power per unit length required to maintain the same surface temperature is 400W/m. Calculate and compare the convection coefficients for the flows of water and air.
An electric resistance heater is embedded in a long cylinder of diameter 30mm. When water with a temperature of 25 C and velocity of 1m/s flows crosswise over the cylinder, the power per unit length required to maintain the surface at a uniform temperature of 90 C is 28kW/m. When air, also at 25 C, but with a velocity of 10m/s is flowing, the power per unit length required to maintain the same surface temperature is 400W/m. Calculate and compare the convection coefficients for the flows of water and air.
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter7: Forced Convection Inside Tubes And Ducts
Section: Chapter Questions
Problem 7.4P
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An electric resistance heater is embedded in a long cylinder of
diameter 30mm. When water with a temperature of 25 C and velocity
of 1m/s flows crosswise over the cylinder, the power per unit length
required to maintain the surface at a uniform temperature of 90 C is
28kW/m. When air, also at 25 C, but with a velocity of 10m/s is
flowing, the power per unit length required to maintain the same
surface temperature is 400W/m. Calculate and compare the convection
coefficients for the flows of water and air.
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