9.) Consider a cold aluminum canned drink that is initially at a uniform temperature of 3°C. The can is 12.5 cm high and has a diameter of 6 cm. If the combined convection/radiation heat transfer coefficient between the can and the surrounding air at 25°C is 10 W/m2-°C, determine (a)how long it will take for the average temperature of the drink to rise to 10°C. (b)ln an effort to slow down the warming of the cold drink, a person puts the can in a perfectly fitting 1-cm-thick cylindrical rubber insulation (k= 0.13 W/m-°C). Now how long will it take for the average temperature of the drink to rise to 10°C? Assume the top of the can is not covered. (c) Assuming a thermal contact resistance of 0.00008 m2.°C/W between the can and the insulation. 3°C 12.5 cm T = 25°C air 6 cm

9.) Consider a cold aluminum canned drink that is initially at a uniform temperature of 3°C. The can is 12.5 cm high and has a diameter of 6 cm. If the combined convection/radiation heat transfer coefficient between the can and the surrounding air at 25°C is 10 W/m2-°C, determine (a)how long it will take for the average temperature of the drink to rise to 10°C. (b)ln an effort to slow down the warming of the cold drink, a person puts the can in a perfectly fitting 1-cm-thick cylindrical rubber insulation (k= 0.13 W/m-°C). Now how long will it take for the average temperature of the drink to rise to 10°C? Assume the top of the can is not covered. (c) Assuming a thermal contact resistance of 0.00008 m2.°C/W between the can and the insulation. 3°C 12.5 cm T = 25°C air 6 cm

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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