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ISSN 打印: 1064-2285
ISSN 在线: 2162-6561

传热学

DOI: 10.1615/HeatTransRes.2016011959
pages 435-463

EXPERIMENTAL AND NUMERICAL INVESTIGATION OF VORTEX PROMOTER EFFECTS ON HEAT TRANSFER FROM HEATED ELECTRONIC COMPONENTS IN A RECTANGULAR CHANNEL WITH AN IMPINGING JET

Mustafa Kilic
Adana Science and Technology University, Department of Mechanical Engineering, Department of Mechanical Engineering, Dep. of Mechanical Engineering, Yesiloba Yerleskesi Yesiloba Mah. Ogretmenler Bulvarı 46278 Sokak No:3 01180 Seyhan / ADANA
Tamer Calisir
Gazi University
Senol Baskaya
Department of Mechanical Engineering, Gazi University, Eti Mah. Yukselis Sok. 5, 06570 Ankara, Turkey

ABSTRACT

Thermal control of electronic components is a continuously emerging problem as power loads keep increasing. In this study effects of vortex promoter on cooling 18 flash-mounted electronic components, which have constant heat fluxes, inside a rectangular channel, consisting of one open and three blocked sides were investigated experimentally and numerically by using a single jet flow. Copper blocks were used as electronic components. Flow velocities at the inlet to the channel were measured by using a Laser Doppler Anemometer (LDA) system. Temperature measurements were performed by using thermocouples. In order to improve heat transfer from electronic components, effects of vortex promoter parameters (length, location, number, and angular position) on heat transfer were investigated for a Reynolds number of Re = 8000, heat flux q" = 1000 W/m2, and the ratio of the jet-to-plate distance to hydraulic diameter of a nozzle H/Dh = 6. The local and mean Nu numbers were determined as a function of the ratio of distance between vortex promoter and jet inlet to hydraulic diameter of jet inlet (N/Dh) in the range 0.55-5.0, the ratio of vortex promoter's length to channel height (K/H) in the range 0.5-0.9, the ratio of the distance between two vortex promoters to channel height (W/H) in the range 0.5-1.5, and the angle of vortex promoter θ in the range (-5°-(+45°). The low-Reynolds number k-ε turbulence model was used in numerical investigations. The heat transfer rate for N/Dh = 0.7-5.0 improved when the vortex promoter approached the jet entrance. It was observed that heat transfer is sensitive to the location, length, and angular position of the vortex promoter.


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