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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

The orientation effect of various fin-type cylindrical heat sinks

Seung-Jae Park
School of Mechanical Engineering, Hanyang University, Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea

Junghan Kim
Hanyang University

Kwan-Soo Lee
Hanyang University


This study investigated the orientation effect, i.e., the variation in thermal performance with the installation angle, for various fin-type cylindrical heat sinks to improve the cooling of light-emitting diode (LED) bulbs, Cylindrical heat sink with plate, pin, and inclined pin fins were considered. Natural convective heat transfer and radiative heat transfer around the heat sink were simulated with a numerical analysis method and the model was validated experimentally. To determine the reasons for the variation in the orientation effect, the thermos-flow characteristics were analyzed and the drag coefficient was calculated. The geometric parameters of the cylindrical heat sink were studied, and a fin shape that most improved the orientation effect of the heat sink was suggested. In the case of pin-fin type heat sink, the flow was formed between the pin-fins and air could reach the upper region of the heat sink. The inclined pin-fin heat sink increased the flow path length compared with the uninclined pin-fin heat sink. However, when the inclination angle of the pin-fin was increased too much, only the blocking effect of the pin-fin was increased and not the flow path length. Therefore, the thermal performance was reduced compared with that of the uninclined pin-fin heat sink. Finally, correlations that predicted the thermal performance variation were determined as a function of the geometric parameters and installation angles.

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