Q) An apple has been put into a freezer at (-13°C) to be cooled. Initially, the apple is at a uniform temperature of 23°C. The convection heat transfer coefficient on its surface is 7 W/m².°C. Assuming the apple as a sphere having a diameter of 6.5-cm and taking its properties as p = 930 kg/m³, cp = 3010 J/kg°C, and k = 0.490 W/m-°c, determine; (a) the center %3D temperature of the apple in 30 minutes, (b) the actual amount of heat transfer from the apple, and (c) the final equilibrium temperature of the apple. Hint: consider the temperature is a function of location and time.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Q) An apple has been put into a freezer at (-13°C) to be cooled. Initially,
the apple is at a uniform temperature of 23°C. The convection heat transfer
coefficient on its surface is 7 W/m2.°C. Assuming the apple as a sphere
having a diameter of 6.5-cm and taking its properties as p = 930 kg/m³, cp
= 3010 J/kg°C, and k
0.490 W/m-°C, determine; (a) the center
=
%3D
temperature of the apple in 30 minutes, (b) the actual amount of heat
transfer from the apple, and (c) the final equilibrium temperature of the
apple.
Hint: consider the temperature is a function of location and time.
Transcribed Image Text:Q) An apple has been put into a freezer at (-13°C) to be cooled. Initially, the apple is at a uniform temperature of 23°C. The convection heat transfer coefficient on its surface is 7 W/m2.°C. Assuming the apple as a sphere having a diameter of 6.5-cm and taking its properties as p = 930 kg/m³, cp = 3010 J/kg°C, and k 0.490 W/m-°C, determine; (a) the center = %3D temperature of the apple in 30 minutes, (b) the actual amount of heat transfer from the apple, and (c) the final equilibrium temperature of the apple. Hint: consider the temperature is a function of location and time.
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