An orange of diameter 10 cm is initially ata uniform temperature of 30°C. It is placed in a refrigerator in which the airtemperature is 2°C. If the heat transfer coefficient between the air and...

An orange of diameter 10 cm is initially at

a uniform temperature of 30°C. It is placed in a refrigerator in which the air

temperature is 2°C. If the heat transfer coefficient between the air and the

orange surface is 50 W/m
2
K, determine the time required for the

centre of the orange to reach 10°C. Assume the thermal properties of the orange

are the same as those of water at the same temperature (a = 1.4

10
–7
m
2
/s

and k = 0.59 W/m K).

Oct 06, 2022

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An orange of diameter 10 cm is initially ata uniform temperature of 30°C. It is placed in a refrigerator in which the airtemperature is 2°C. If the heat transfer coefficient between the air and...

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