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research-article

OPTIMIZATION OF VORTEX PROMOTER PARAMETERS TO ENHANCE HEAT TRANSFER RATE IN ELECTRONIC EQUIPMENT

[+] Author and Article Information
Ulku Ece Ayli

Sogutozu Cad. No:43 Sogutozu cad no:43 Ankara, 06560 Turkey eceayli@gmail.com

Ozgur Bayer

METU METU Ankara, Ankara 06810 Turkey byrzgr@gmail.com

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Thermal Science and Engineering Applications. Manuscript received November 20, 2018; final manuscript received June 9, 2019; published online xx xx, xxxx. Assoc. Editor: Sujoy K. Saha.

ASME doi:10.1115/1.4043994 History: Received November 20, 2018; Accepted June 09, 2019

Abstract

In this paper optimization of the location and the geometry of a vortex promoter, located above in a finned surface in a channel with eight heat sources is investigated for a Reynolds number range of 12500<Re<27700. Heat transfer rates and corresponding Nusselt number distributions are studied both experimentally and numerically using different vortex promoter geometries (square, circular and triangular) in different locations to illustrate the effect of vortex promoter on fluid flow. Optimization study considered a range of following parameters: blockage ratio of 0.3<y/C<0.45, and inter-promoter distance ratio of 0.2277<x/L<0.3416. Results show that fins over which rectangular and circular promoters are integrated perform better performance in enhancing the heat transfer. According to the numerical and experimental results, higher blockage ratios cause significantly higher heat transfer coefficients. According to the observations, as the inter-promoter distances increase, shedding gains strength and more turbulence is created. All vortex promoters enhance heat transfer resulting in a lower temperature values on the finned surface for different y/C and x/L values, and Reynolds numbers. Using promoters enhance the heat transfer and the decrease in the maximum temperature values is recorded on finned surface changing in between %15 to %27. The biggest decrease in maximum surface temperature value is 500 K to 364 K and observed in circular promoter case with, y/C=0.43 and x/L=0.3416 and Reynolds numbers of 22200.

Copyright © 2019 by ASME
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