Experimental study on heat transfer from rectangular fins in combined convection

Journal article

Basiri, M., Goshayeshi, H., Chaer, I., Pourpasha, H. and Heris, S.Z. (2023). Experimental study on heat transfer from rectangular fins in combined convection. Journal of Thermal Engineering. 9 (6), pp. 1632-1642. https://doi.org/10.18186/thermal.1401534
AuthorsBasiri, M., Goshayeshi, H., Chaer, I., Pourpasha, H. and Heris, S.Z.
Abstract

Combined natural and forced convective heat transfer arise in many transport processes in engineering devices and in nature, which is frequently encountered in industrial and technical processes, including electronic devices cooled by fans, heat exchangers placed in a low-velocity environment, and solar receivers exposed to winds. In this study, the effects of design
parameters have been experimentally investigated for the air-side thermal performance under combined (natural and forced)convection of the rectangular plate heat sinks, and the values of optimum design parameters were sought. Many ideas for improving cooling methods have been proposed, one of which is the heat sink. In this work, the average Nusselt number (Nu) and thermal resistance of a simple base rectangular plate and five vertical rectangular plate heat sinks with different numbers of fins under natural and combined convection were experimentally investigated to obtain the maximum average Nu and minimum thermal resistance for various Reynolds numbers (Re) from 2300 to 40000, Rayleigh numbers (Ra) from 1300000 to 13000000, and Richardson numbers (Ri) from 0.4 to 3. Also, in this experiment, fin spacing (P) was varied from 2.8 mm to 14.6 mm and the dimensionless P/H ratio was varied from 0.1
to 0.49. The flow velocity varied in the range of 2 to 8 m/s under combined convection. Based on the effects of Ri and Re, two empirical equations for natural and also for combined convection heat transfer were derived to calculate the average Nu. The average deviation for these two equations is about 7%.The outcomes of this research can be beneficial for engineers who
work on electronics cooling systems.

KeywordsPlate Heat Sink; Combined Convection; Rectangular Fin; Richardson Number; Empirical Equation
Year2023
JournalJournal of Thermal Engineering
Journal citation9 (6), pp. 1632-1642
PublisherYıldız Technical University
ISSN2148-7847
Digital Object Identifier (DOI)https://doi.org/10.18186/thermal.1401534
Web address (URL)https://dergipark.org.tr/tr/pub/thermal/issue/81272/1401534
Publication dates
Online30 Nov 2023
Publication process dates
Completed30 Nov 2023
Deposited20 Dec 2023
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