Concept explainers
(a)
The rate of heat transfer by natural convection.
(a)
Explanation of Solution
Given:
The diameter of first sphere
The diameter of second sphere
The surface temperature of first sphere
The surface temperature of second sphere
Calculation:
Calculate the film temperature.
Refer Table A-22, “Properties of air at
Obtain the following properties of air corresponding to
Calculate the characteristic length.
Calculate the Rayleigh number.
Calculate the view function.
Calculate the thermal conductivity.
Calculate rate of heat transfer by natural convection.
Thus, rate of heat transfer by natural convection is
(b)
The rate of heat transfer by radiation.
(b)
Explanation of Solution
Calculation:
Calculate the rate of heat transfer by radiation.
Thus, the rate of heat transfer by radiation is
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Chapter 21 Solutions
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