EXPERIMENTAL AND NUMERICAL INVESTIGATION OF VORTEX PROMOTER EFFECTS ON HEAT TRANSFER FROM HEATED ELECTRONIC COMPONENTS IN A RECTANGULAR CHANNEL WITH AN IMPINGING JET
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Tarih
2017
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Begell House Inc
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
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/m(2), and the ratio of the jet-to-plate distance to hydraulic diameter of a nozzle H/D-h = 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/D-h) 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. in the range (-5(o)-(+45(o)).The low-Reynolds number k- epsilon turbulence model was used in numerical investigations. The heat transfer rate for N/D-h = 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.
Açıklama
Anahtar Kelimeler
impinging jet, heat transfer, channel, vortex promoter, CFD
Kaynak
Heat Transfer Research
WoS Q Değeri
Q4
Scopus Q Değeri
Q2
Cilt
48
Sayı
5
