H143 Reduction of thermal resistance of naturally-cooled cooling system

Reduction of thermal resistance of naturally-cooled cooling system has been investigated. Pin-fin type heat sink was utilized as to clarify the effect of pin arrangement on the thermal performance of heat sink. The pitch of fins was set 1, 2, 3, 4, 5mm where the surface area of all heat sink was set as the same. The results show that the thermal resistance of heat sink decreases with increasing pitch of fin arrangement from 1 to 4mm, whereas the thermal resistance gets increase when the pitch was set 5mm. The results also show that even the slight decrease in fin efficiency causes the increase in the thermal resistance.