A long copper rod of diameter 2.0 cm is initially at a uniform temperature of 100°C. It is now exposed to 'an air stream at 13°C with a heat transfer coefficient of 200 W/m2.K. How long would it take for the copper road to cool to an average temperature of 25°C? (Express the answers in seconds.) (Thermal properties of copper: k= 401 W/m-°C, p= 8933 kg/m3, Cp = 0.385 kJ/kg.°C.) 0.17 x S.
A long copper rod of diameter 2.0 cm is initially at a uniform temperature of 100°C. It is now exposed to 'an air stream at 13°C with a heat transfer coefficient of 200 W/m2.K. How long would it take for the copper road to cool to an average temperature of 25°C? (Express the answers in seconds.) (Thermal properties of copper: k= 401 W/m-°C, p= 8933 kg/m3, Cp = 0.385 kJ/kg.°C.) 0.17 x S.
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.
Chapter6: Forced Convection Over Exterior Surfaces
Section: Chapter Questions
Problem 6.36P
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![A long copper rod of diameter 2.0 cm is initially at a uniform
temperature of 100°C. It is now exposed to an air stream at 13°C
with a heat transfer coefficient of 200 W/m2.K. How long would it
take for the copper road to cool to an average temperature of
25°C? (Express the answers in seconds.)
(Thermal properties of copper: k= 401 W/m-°C, p= 8933 kg/m, cp
= 0.385 kJ/kg-°C.)
0.178 s.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9bf88aac-5ef5-4164-96e6-685db21d99b3%2F9e2e9838-5719-4af3-b382-94d544b0d9c4%2F7nmi5os_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A long copper rod of diameter 2.0 cm is initially at a uniform
temperature of 100°C. It is now exposed to an air stream at 13°C
with a heat transfer coefficient of 200 W/m2.K. How long would it
take for the copper road to cool to an average temperature of
25°C? (Express the answers in seconds.)
(Thermal properties of copper: k= 401 W/m-°C, p= 8933 kg/m, cp
= 0.385 kJ/kg-°C.)
0.178 s.
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