An apple is placed in a freezer at -15 ° C. In the beginning, the heat transfer rate on the surface of the apple with a uniform temperature of 20 ° C is 8 W / m2 ° C. Taking the apple as a 9 cm diameter sphere and taking the physical properties p = 840 kg / m2, c, -3.81 kJ / kg ° C, k-0.418 W / m ° C and a = 1.3 * 107 m2 / s, after 65 minutes ) calculate core (° C) and b) surface temperatures (° C).
An apple is placed in a freezer at -15 ° C. In the beginning, the heat transfer rate on the surface of the apple with a uniform temperature of 20 ° C is 8 W / m2 ° C. Taking the apple as a 9 cm diameter sphere and taking the physical properties p = 840 kg / m2, c, -3.81 kJ / kg ° C, k-0.418 W / m ° C and a = 1.3 * 107 m2 / s, after 65 minutes ) calculate core (° C) and b) surface temperatures (° C).
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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An apple is placed in a freezer at -15 ° C. In the beginning, the heat transfer rate on the surface of the apple with a uniform temperature of 20 ° C is 8 W / m2 ° C. Taking the apple as a 9 cm diameter sphere and taking the physical properties p = 840 kg / m2, c, -3.81 kJ / kg ° C, k-0.418 W / m ° C and a = 1.3 * 107 m2 / s, after 65 minutes ) calculate core (° C) and b) surface temperatures (° C).
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