Heat transfer Q2) Carbon steel balls (p= 7833 kg/m3, k = 54 W/m · °C, Cp= 0.465 kJ/kg · °C, and a=1.474 x 10-6 m2/s) 8 mm in diameter are annealed by heating them first to 900°C in a furnaceand then allowing them to cool slowly to 100°C in ambient air at 35°C. If the average heattransfer coefficient is 75 W/m2 °C, determine how long the annealing process will take. If2500 balls are to be annealed per hour, determine the total rate of heat transfer from the ballsto the ambient air.Air.Furnace900°C100°C

Solutio:- Calculate the characteristic length. Lc = VAsLc =πD3/6πD2Lc =D6Lc =0.0086Lc…

Answered: Heat transfer

Engineering

Mechanical Engineering

Heat transfer

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

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.

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Heat transfer

Q2) Carbon steel balls (p= 7833 kg/m3, k = 54 W/m · °C, Cp= 0.465 kJ/kg · °C, and a=
1.474 x 10-6 m2/s) 8 mm in diameter are annealed by heating them first to 900°C in a furnace
and then allowing them to cool slowly to 100°C in ambient air at 35°C. If the average heat
transfer coefficient is 75 W/m2 °C, determine how long the annealing process will take. If
2500 balls are to be annealed per hour, determine the total rate of heat transfer from the balls
to the ambient air.
Air.
Furnace
900°C
100°C

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