03. Electronics Packaging and Thermal Management

To develop an energy saving air cooling technique for high performance electronics, the air cooling performance is experimentally evaluated for corrugated lotus fins with a unidirectional pore structure. The heat transfer performances of the following three types of fins are evaluated with varying the flow velocity: 1) antiphase placed corrugated lotus fin (antiphase lotus fin), 2) in-phase places corrugated lotus fin (in-phase lotus fin), and 3) rectangular fin without pores. The antiphase and in-phase lotus fins have almost the same pore diameter and porosity. The experimental results verify that the heat transfer coefficient of the antiphase lotus fin increases up to 1.6 times higher than that of the rectangular fin in a low flow velocity regime. However, the heat transfer performance is saturated under high velocity conditions. On the other hand, the heat transfer performance of the in-phase lotus fin is enhanced with increasing the flow velocity. Its heat transfer coefficient is more than twice as high as that of the antiphase lotus fin under high velocity conditions. Both the two lotus fins indicate that the heat transfer is enhanced by the breathing phenomenon which is the flow passing through the pores. The results of the in-phase lotus fin also reveal that to achieve the same heat transfer performance, the fan power can be reduced by approximately 80% compared with the rectangular fin.

Mr.

Masaaki Murakami