| Summary: | 碩士 === 大同大學 === 機械工程研究所 === 89 === Abstract
The object with this paper is to design shape and higher heat dissipated efficiency of heat sink. The volume of heat sink which this paper design is smaller than fin of heat sink. In this paper, heat dissipated efficiency is used to compare with copper and aluminum, respectively.
The origin research to proceed of the main work : 1.Heat sink is manufactured and practical measured the thermal resistance of heat sink. 2.Design shape of heat sink and used the PHOENICS program to simulation and analysis. 3.Use the different dimension conditions to simulation. When constant diameter of holes, change center distance of holes and diameter of holes. When variable diameter of holes, change center distance of holes and diameter of holes in equal difference reduced value. Then, find the best dimension parameter of heat sink which has lowest heat resistance.
From simulation results find, the thermal resistance will be reduced when air flow-rate become larger and larger. And thermal resistance of copper is always lower than thermal resistance of aluminum. When the center distance of holes is single, the center distance of holes is 7 mm（type A）and the diameter of holes is 4 mm, the thermal resistance is lowest. When variable diameter of holes, the equal difference step is 0.1mm (diameter of holes are 4.0 mm, 3.9 mm, 3.8 mm, 3.7 mm) and the center distance of holes at 7 mm, the thermal resistance is lowest.
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