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http://dx.doi.org/10.5916/jkosme.2016.40.9.786

Computational study of orientation effects on thermal performance of natural convection cooled lightweight high performance hollow hybrid fin heat sinks  

Effendi, Nico Setiawan (Department of Mechanical Design Engineering, Pukyong National University)
Kim, Kyoung-Joon (Department of Mechanical Design Engineering, Pukyong National University)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.40, no.9, 2016 , pp. 786-790 More about this Journal
Abstract
This paper discusses numerically explored orientation effects on the thermal performance of hollow hybrid fin heat sinks (HHFHSs) under natural convection. A HHFHS consists of an array of hollow pin fins concatenated with plate fins and having perforations near the fin bases. Orientation effects on the footprint-based and mass-based thermal performance of the HHFHS were numerically studied for orientation angles ranging from $0^{\circ}$ to $180^{\circ}$. The performance of the HHFHS was compared with that of a pin fin heat sink (PFHS) having similar physical parameters. The results show that the thermal resistance of the HHFHS did not vary considerably from $0^{\circ}$ to $45^{\circ}$. The thermal resistance increased from $45^{\circ}$ to $90^{\circ}$, reached its maximum at $90^{\circ}$, and decreased consistently from $90^{\circ}$ to $180^{\circ}$. Dissimilar behaviors of the thermal resistance of the HHFHS vs. the PFHS resulted mainly from the effect of heat pumping induced by the internal flows of the hollow fins. Despite various orientations, the mass-based thermal resistance of the HHFHS was found to be nearly 30% smaller than that of the PFHS. This result shows the feasibility of the HHFHS for the lightweight thermal management of electronics under natural convection.
Keywords
Hollow hybrid fin heat sink; Orientation effect; Lightweight thermal management; Natural convection; CFD;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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