Water at 5°C is being used to cool apples from an initial temperature of 25° to 10°C. The water flow over the surface of the apple creates a convective heat-transfer coefficient of 15 W/(m2-K). Assume the apple can be described as a sphere with a 10 cm diameter and the geometric center is to be reduced to 10°C. The apple properties include thermal conductivity of 0.45 W/(m-K), specific heat of 3.950 kJ/(kg-K), and density of 940 kg/m3 . a. Determine the time that the apples must be exposed to the water. b. If the apple is submerged only for 2 hours, what will be its center temperature?

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
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Water at 5°C is being used to cool apples from an initial temperature of 25° to 10°C. The
water flow over the surface of the apple creates a convective heat-transfer coefficient
of 15 W/(m2-K). Assume the apple can be described as a sphere with a 10 cm diameter
and the geometric center is to be reduced to 10°C. The apple properties include thermal
conductivity of 0.45 W/(m-K), specific heat of 3.950 kJ/(kg-K), and density of 940 kg/m3
.
a. Determine the time that the apples must be exposed to the water.
b. If the apple is submerged only for 2 hours, what will be its center temperature?

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