2. A 15-cm X 20-cm hot surface at 85°C is to be cooled by attaching 4 cm-long aluminum (k = 237 W/m-°C) fins of 2-mm X 2-mm square cross section. The temperature of surrounding medium is 25°C and the heat transfer coefficient on the surfaces can be taken to be 20 W/m2-°C. If it is desired to triple the rate of heat transfer from the bare hot surface, determine the number of fins that needs to be attached. 2. A 15-cm X 20-cm hot surface at 85°C is to be cooled by attaching 4-cm-long aluminum (k = 237 W/m-°C) fins of 2-mm X 2-mm square crosssection. The temperature of surrounding medium is 25°C and the heattransfer coefficient on the surfaces can be taken to be 20 W/m2-°C. If it isdesired to triple the rate of heat transfer from the bare hot surface,determine the number of fins that needs to be attached.

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Answered: 2. A 15-cm X 20-cm hot surface at 85°C…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

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2. A 15-cm X 20-cm hot surface at 85°C is to be cooled by attaching 4 cm-long aluminum (k = 237 W/m-°C) fins of 2-mm X 2-mm square cross section. The temperature of surrounding medium is 25°C and the heat transfer coefficient on the surfaces can be taken to be 20 W/m2-°C. If it is desired to triple the rate of heat transfer from the bare hot surface, determine the number of fins that needs to be attached.

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