A long iron rod (p = 7870 kg/m³, cp = 447 J/kg∙K, k = 80.2 W/m-K, and a = 23.1 × 10- m/s) with diameter of 25 mm is initially heated to a uniform temperature of 700°C. The iron rod is then quenched in a large water bath that is maintained at constant temperature of 50°C and convection heat transfer coefficient of 128 W/m²K. Determine the time required for the iron rod surface temperature to cool to 207°C. Solve this problem using analytical one-term approximation method. Water, 50°C h = 128 W/m²K Iron rod The time required for the iron rod surface temperature to cool to 207°C is | seconds.
A long iron rod (p = 7870 kg/m³, cp = 447 J/kg∙K, k = 80.2 W/m-K, and a = 23.1 × 10- m/s) with diameter of 25 mm is initially heated to a uniform temperature of 700°C. The iron rod is then quenched in a large water bath that is maintained at constant temperature of 50°C and convection heat transfer coefficient of 128 W/m²K. Determine the time required for the iron rod surface temperature to cool to 207°C. Solve this problem using analytical one-term approximation method. Water, 50°C h = 128 W/m²K Iron rod The time required for the iron rod surface temperature to cool to 207°C is | seconds.
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.
Chapter3: Transient Heat Conduction
Section: Chapter Questions
Problem 3.3P
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