5.10 A steel sphere (AISI 1010), 100 mm in diameter, iscoated with a dielectric material layer of thickness2 mm and thermal conductivity 0.04 W/mK. Thecoated sphere is initially at a uniform temperature of500°C and is suddenly quenched in a large oil bath forwhich T = 100°C and h = 3000 W/m² K. Estimate thetime required for the coated sphere temperature to reach150°C. Hint: Neglect the effect of energy storage in thedielectric material, since its thermal capacitance (pcV)is small compared to that of the steel sphere.

The diameter of sphere is The thickness of dielectric matrial is The thermal conductivity of…

5.10 A steel sphere (AISI 1010), 100 mm in diameter, is coated with a dielectric material layer of thickness 2 mm and thermal conductivity 0.04 W/m. K. The coated sphere is initially at a uniform temperature of 500°C and is suddenly quenched in a large oil bath for which Tỵ = 100°C and h = 3000 W/m² · K. Estimate the time required for the coated sphere temperature to reach 150°C. Hint: Neglect the effect of energy storage in the dielectric material, since its thermal capacitance (pcV) is small compared to that of the steel sphere.

5.10 A steel sphere (AISI 1010), 100 mm in diameter, is coated with a dielectric material layer of thickness 2 mm and thermal conductivity 0.04 W/m. K. The coated sphere is initially at a uniform temperature of 500°C and is suddenly quenched in a large oil bath for which Tỵ = 100°C and h = 3000 W/m² · K. Estimate the time required for the coated sphere temperature to reach 150°C. Hint: Neglect the effect of energy storage in the dielectric material, since its thermal capacitance (pcV) is small compared to that of the steel sphere.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.

Question

5.10 A steel sphere (AISI 1010), 100 mm in diameter, is
coated with a dielectric material layer of thickness
2 mm and thermal conductivity 0.04 W/mK. The
coated sphere is initially at a uniform temperature of
500°C and is suddenly quenched in a large oil bath for
which T = 100°C and h = 3000 W/m² K. Estimate the
time required for the coated sphere temperature to reach
150°C. Hint: Neglect the effect of energy storage in the
dielectric material, since its thermal capacitance (pcV)
is small compared to that of the steel sphere.

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