A 6 cm diameter metallic sphere initially at a uniform temperature of 400 °C is placed in a controlled convective environment where the temperature is 80 °C and the convective heat transfer coefficient is 8 W m-2 K-1. The metal has a specific heat capacity of 460 J kg-1 K-1, a thermal conductivity of 35 W m-1 K-1 and a density of 7800 kg m-3. The time for the metallic sphere to reach a temperature of 100 °C is which of the following values? (You may treat this using the lumped approach.)
A 6 cm diameter metallic sphere initially at a uniform temperature of 400 °C is placed in a controlled convective environment where the temperature is 80 °C and the convective heat transfer coefficient is 8 W m-2 K-1. The metal has a specific heat capacity of 460 J kg-1 K-1, a thermal conductivity of 35 W m-1 K-1 and a density of 7800 kg m-3. The time for the metallic sphere to reach a temperature of 100 °C is which of the following values? (You may treat this using the lumped approach.)
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.
Chapter2: Steady Heat Conduction
Section: Chapter Questions
Problem 2.40P: One end of a 0.3-m-long steel rod is connected to a wall at 204C. The other end is connected to a...
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A 6 cm diameter metallic sphere initially at a uniform temperature of 400 °C is placed in a controlled convective environment where the temperature is 80 °C and the convective heat transfer coefficient is 8 W m-2 K-1. The metal has a specific heat capacity of 460 J kg-1 K-1, a thermal conductivity of 35 W m-1 K-1 and a density of 7800 kg m-3. The time for the metallic sphere to reach a temperature of 100 °C is which of the following values? (You may treat this using the lumped approach.)
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