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a) How long does the temperature at the fruit's center was decreased 20°C from the initial state b) The lowest temperature of this fruit at that calculated time [from question (a)]

a) How long does the temperature at the fruit's center was decreased 20°C from the initial state b) The lowest temperature of this fruit at that calculated time [from question (a)]

Elements Of Electromagnetics
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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A fruit with a diameter of 8 cm (k=0.5 W/m °C, a=1.5*10") and uniform temperature of 25°C, was frozen in a refrigerator at -2°C by circulating flow of the air at velocity of 0.2 m/s and its average heat transfer coefficient between fruit and air of 25 W/m2 °C. a) How long does the temperature at the fruit's center was decreased 20°C from the initial state b) The lowest temperature of this fruit at that calculated time [from question (a)]
Transcribed Image Text:A fruit with a diameter of 8 cm (k=0.5 W/m °C, a=1.5*10") and uniform temperature of 25°C, was frozen in a refrigerator at -2°C by circulating flow of the air at velocity of 0.2 m/s and its average heat transfer coefficient between fruit and air of 25 W/m2 °C. a) How long does the temperature at the fruit's center was decreased 20°C from the initial state b) The lowest temperature of this fruit at that calculated time [from question (a)]
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