Cold zone exploration using position of maximum Nusselt number for inclined air jet cooling

Inclined jet air cooling can be effectively used for cooling of electronics or other such applications. The non-confined air jet is impinged and experimentally investigated on the hot target surface to be cooled, which is placed horizontally. Analysis and evaluations are made by introduction of a je...

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Bibliographic Details
Published in:Archive of Mechanical Engineering 2017-12, Vol.64 (4), p.533-549
Main Authors: Ingole, Sunil B, Sundaram, K K
Format: Article
Language:English
Subjects:
Air cooling
Air jets
cold zone
Cooling
Fluid flow
inclined jet
Jet impingement
Leading edges
Nusselt number
Reynolds number
Side cooling
Stagnation point
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Summary:Inclined jet air cooling can be effectively used for cooling of electronics or other such applications. The non-confined air jet is impinged and experimentally investigated on the hot target surface to be cooled, which is placed horizontally. Analysis and evaluations are made by introduction of a jet on the leading edge and investigated for downhill side cooling to identify cold spots. The jet Reynolds number in the range of 2000 ≤ Re ≤ 20000 is examined with a circular jet for inclination (Ɵ) of 15 < Ɵ < 75 degree. Also, the consequence of a jet to target distance (H) is explored in the range 0.5 ≤ H/D ≤ 6.8. For 45 degree jet impingement, the maximum Nusselt number is widely spread. Location of maximum Nusselt number is studied, which indicates cold spots identification. At a higher angle ratio, the angle is the dominating parameter compared to the Reynolds Number. Whereas at a lower angle ratio, the inclined jet with a higher Reynolds number is giving the cooling point away from leading edge. It is observed that for a particular angle of incident location of maximum Nusselt Number, measured from leading edge of target, is ahead than that of stagnation point in stated conditions.
ISSN:0004-0738
2300-1895
DOI:10.1515/meceng-2017-0031