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Category > Applied Sciences Posted 16 May 2017 My Price 5.00

We often cut a watermelon in half and put it into the freezer

We often cut a watermelon in half and put it into the freezer to cool it quickly. But usually we forget to check on it and end up having a watermelon with a frozen layer on the top. To avoid this potential problem a person wants to set the timer such that it will go off when the temperature of the exposed surface of the watermelon drops to 3°C. Consider a 25-cm-diameter spherical watermelon that is cut into two equal parts and put into a freezer at 12°C. Initially, the entire watermelon is at a uniform temperature of 25°C, and the heat transfer coefficient on the surfaces is 22 W/m2· °C. Assuming the watermelon to have the properties of water, determine how long it will take for the center of the exposed cut surfaces of the watermelon to drop to 3°C.

 

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Alpha Geek
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Status NEW Posted 16 May 2017 11:05 AM My Price 5.00

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file 1494932661-Answer.docx preview (196 words )
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