Effects of Pin-perforation Shape on Thermal Enhancement Factor of Pin-fin Heat Sink via Numerical Simulation

DOI: 10.14416/j.ind.tech.2023.03.002

Authors

  • Parinya Ackaradetruangsri Department of Mechanical Engineering Technology, College of Industrial Technology, King Mongkut’s University of Technology North Bangkok
  • Pawat Jantasorn Department of Mechanical Engineering Technology, College of Industrial Technology, King Mongkut’s University of Technology North Bangkok
  • Ukrit Thamma Department of Mechanical Engineering Technology, College of Industrial Technology, King Mongkut’s University of Technology North Bangkok
  • Athasit Wongcharoen Department of Mechanical Engineering Technology, College of Industrial Technology, King Mongkut’s University of Technology North Bangkok

Keywords:

Circular pin-fin heat sink, Nusselt number, Pressure drop, Thermal enhancement factor

Abstract

Effects of pin-perforation shape on the thermal enhancement factor of pin-fin heat sink via numerical simulation are presented here in this study. The material for the pin-fin heat sink is assigned to be an aluminum alloy, and the shape of the pin fins on the heat sink is circular. The heat source generating 45 W of heat flux is placed on the bottom of the heat sink. The inlet air temperature and velocity are 300 K and 5.2 m/s, respectively. The numerical air-flow model of steady turbulent main flow follows the standard k – ε. Four pin-perforation shapes on pin fins are diamond, triangular, hexagonal, and circular of which all share the same ratio of the air/heat-sink interfacial surface area (ISA) to the total volume of the heat sink (TVH) of approximately 0.54 mm-1. The lowest to highest Nusselt number (Nu), which represents the convective heat transfer efficiency, is found in diamond-perforation, triangular-perforation, hexagonal-perforation, and circular-perforation pin-fin heat sink, respectively. The lowest to highest pressure drop (ΔP), which signifies the hydraulic friction loss due to airflow restriction caused by pin-fin heat sinks, is found in circular-perforation, hexagonal-perforation, diamond-perforation, and triangular-perforation pin-fin heat sink, respectively. Lastly, the thermal enhancement factor (TEF), a ratio of the convective heat transfer efficiency to friction loss, from the lowest to highest are diamond-perforation, triangular-perforation, hexagonal-perforation, and circular-perforation pin-fin heat sinks, respectively. The circular-perforation pin-fin heat sink is shown to yield the highest TEF which is 43.1% higher than that of the pin-fin heat sink without pin-perforation.

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Published

2023-03-19

Issue

Vol. 19 No. 1 (2023): January-April

Section

บทความวิจัย (Research article)

License

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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