A long 20 cm diameter shaft made of stainless steel 304 comes out of an oven at a uniform temperature of 600°C. The shaft is then allowed to cool slowly in an environment at 200°C with an average heat transfer coefficient of h = 80 W/m²-K. Determine [a] the temperature at the center of the shaft and [b] the temperature of the outer surface of the shaft 45 minutes after the start of the cooling

A long 20 cm diameter shaft made of stainless steel 304 comes out of an oven at a uniform temperature of 600°C. The shaft is then allowed to cool slowly in an environment at 200°C with an average heat transfer coefficient of h = 80 W/m²-K. Determine [a] the temperature at the center of the shaft and [b] the temperature of the outer surface of the shaft 45 minutes after the start of the cooling

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

A long 20 cm diameter shaft made of stainless steel 304 comes out of an oven at a
uniform temperature of 600°C. The shaft is then allowed to cool slowly in an environment
at 200°C with an average heat transfer coefficient of h = 80 W/m².K. Determine [a] the
temperature at the center of the shaft and [b] the temperature of the outer surface of the
shaft 45 minutes after the start of the cooling
Given:
Find:
Schematic:
Assume:
Property Data:
k= 14.9 W/m°C
p= 7900 kg/m³
Cp = 477 J/kg:K
a= 3.95 x 10-6 m²/s

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