Thermodynamics HW Solutions 226

Thermodynamics HW Solutions 226 - Chapter 15 Steady Heat...

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Chapter 15 Steady Heat Conduction 3-100C Welding or tight fitting introduces thermal contact resistance at the interface, and thus retards heat transfer. Therefore, the fins formed by casting or extrusion will provide greater enhancement in heat transfer. 3-101C If the fin is too long, the temperature of the fin tip will approach the surrounding temperature and we can neglect heat transfer from the fin tip. Also, if the surface area of the fin tip is very small compared to the total surface area of the fin, heat transfer from the tip can again be neglected. 3-102C Increasing the length of a fin decreases its efficiency but increases its effectiveness. 3-103C Increasing the diameter of a fin will increase its efficiency but decrease its effectiveness. 3-104C The thicker fin will have higher efficiency; the thinner one will have higher effectiveness. 3-105C The fin with the lower heat transfer coefficient will have the higher efficiency and the higher effectiveness.
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This note was uploaded on 01/14/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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