Publication: Geometrical influences on natural convection heat dissipation of heat sink
Date
2023-07-06
Authors
Lim, Xing Qi
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Abstract
The current study focuses on the computational evaluation of the heat dissipation of a triangular plate-fin heat sink. The simulation model consists of a period of an aluminium triangular plate-fin heat sink, vertically placed, exposed to the ambient under standard pressure, approximately 101 kPa, and a room temperature of 27°C. A constant heat flux of 2000 W m-2 is applied at the bottom surface of the heat sink. A parametric study is carried out to study the influences of the geometric parameters on the thermal performance of the heat sink, evaluated by the maximum temperature of the heat sink at steady state and its thermal resistance. When the triangular plate-fin heat sink is compared with a conventional rectangular plate-fin heat sink, the triangular plate-fin heat sink has outperformed the conventional heat sink. When fin height increases from 2 cm to 6 cm, the triangular plate-fin heat sink has the lowest thermal
resistance at 6 cm. Fin height has a significant effect on the maximum temperature at a steady state and the thermal resistance. For fin width ranging from 1 cm to 3 cm, the maximum temperature of the heat sink shows an increasing trend. The period width of the heat sink has been reduced from 4 cm to 2 cm and the triangular plate-fin heat sink performs the best at 2 cm. Interruptions do not enhance the performance of the plate-fin heat sink. After studying the continuous plate-fin heat sink, a staggered arrangement will be studied. When the gap width increases, the maximum temperature and the thermal resistance of the heat sink decrease significantly. Number of staggered fins comes from the segmentation of a complete fin. When the number of fins increases, the thermal performance of the heat sink will be enhanced. Lastly, the fin orientation of the staggered fin will be studied with the fin orientations of 0°, 22.5°, 45°, 67.5°, and 90°. It is found that 22.5° fin-oriented heat sink produced the best performance.