Experiment and simulation analysis of oriented cut copper fiber heat sink for LED water cooling

Abstract

In order to address the heat dissipation issue of LED light sources, an oriented cut copper fiber heat sink (Oriented-CCFHS) for LED water cooling was designed and prepared in this paper. The heat transfer performance and flow characteristics of Oriented-CCFHS, cavity heat sink, small channel heat sink, and random cut copper fiber heat sink (Random-CCFHS) were compared by experiments. Flow and heat transfer performance are obtained through Fluent simulation. Both experiment and simulation results show that the heat transfer performance of Random-CCFHS and Oriented-CCFHS were better than that of cavity heat sink and small channel heat sink. Compared with Random-CCFHS, the heat transfer performance of the Oriented-CCFHS is slightly worse, but the pressure drop is significantly smaller. The comprehensive heat transfer performance of Oriented-CCFHS is superior to that of Random-CCFHS with the same porosity. The performance of the oriented sintered heat sink under different structural parameters is predicted by numerical model. The heat transfer performance of the sintered core is optimal when the thickness of the sintered core is 2 mm. The longer sintered core with oriented copper fiber, the greater the pressure drop of heat sink and the stronger the heat transfer performance, however, the enhancement trend gradually slows down.

Keywords

• LED
• Oriented sintering
• Heat transfer enhancement
• Flow characteristics