Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
COMPARATIVE THERMAL PERFORMANCE OF FLAT PLATE FINS AND INLINE STRIP FINS HEAT SINKS
Submission Author:
William Denner Pires Fonseca , SP
Co-Authors:
William Denner Pires Fonseca, Carlos Altemani
Presenter: William Denner Pires Fonseca
doi://10.26678/ABCM.ENCIT2018.CIT18-0399
Abstract
Comparative results for the convective thermal resistance of continuous plate fins and inline strip fins heat sinks are presented based on correlations from the literature for the Nusselt number for the fins of both heat sink configurations. The purpose of this investigation is to compare the thermal performance of both heat sinks with the same base and fins height and thickness, under similar forced airflow cooling conditions. The Nusselt number heat transfer correlations from the literature considered the heat transfer from the fins, but did not include the convection from the bare heat sink base (not covered by the fins). Thus, this additional heat transfer from the heat sink base was evaluated and included in a new more realistic model and the results were compared with those from the literature models. The results showed that when compared to the plate fins heat sinks, the inline strip fins convective heat transfer coefficients were larger enough to compensate for their reduced heat transfer area, resulting in smaller convective thermal resistances. It was also verified that the convective thermal resistance decreases with the strip length, due to larger convective heat transfer coefficients on the fins. When the heat transfer from the heat sinks base was considered, there was an additional reduction of the heat sinks convective thermal resistance to the cooling fluid.
Keywords
Heat sinks, Convective Thermal Resistance, Inline Strip Fins, Plate Fins
