Numerical Investigation of Turbulent Heat Convection from Solid and Longitudinally Perforated Rectangular Fins

• Published in: Procedia engineering Vol. 56; pp. 497 - 502
• Main Authors: Ismail, Md. Farhad, Reza, M.O., Zobaer, M.A., Ali, Mohammad
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2013
• Subjects: Fin effectiveness; Micro heat sink; Perforated fins; Pressure drop; Turbulent flow; Perforated fins; Turbulent flow; Pressure drop; Micro heat sink; Fin effectiveness
• ISSN: 1877-7058; 1877-7058
• DOI: 10.1016/j.proeng.2013.03.152

Micro heat sinks are adopted in electronics cooling together with different technologies to enhance the heat transfer process. To improve the cooling performance of heat sink, perforations such as small channels of square and circular cross sections are arranged along with stream wise fin's length. A numerical investigation is conducted in this study for three-dimensional fluid flow and convective heat transfer from an array of solid and perforated fins that are mounted on a flat plate. Incompressible air as working fluid is modeled using the Navier–Stokes equations and RNG based k- turbulent model is used to predict turbulent flow parameters. Temperature field inside the fins is obtained by solving Fourier law of heat conduction equation. Flow and heat transfer characteristics are presented for Reynolds numbers from 2×104 to 3.9 ×104 based on the fin length and Prandtl number is taken as Pr = 0.71. Numerical simulation is validated with the published experimental results of the previous investigators and good agreement is observed. Results show that the fins of circular perforations have remarkable heat transfer enhancement and reduced pressure drop. The results of this study can help designing micro heat sinks for heat removal from electronic devices.