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http://dx.doi.org/10.3795/KSME-B.2008.32.4.283

Effect of Inclined Jet on Heat/Mass Transfer for Impingement/Effusion Cooling System  

Hong, Sung-Kook (연세대학교)
Rhee, Dong-Ho (한국항공우주연구원)
Cho, Hyung-Hee (연세대학교 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.32, no.4, 2008 , pp. 283-289 More about this Journal
Abstract
An experimental investigation was conducted to investigate the heat/mass transfer for impingement/effusion cooling system with inclined jet. Jets with inclined angle of 60 are applied to impingement/effusion cooling. At the jet Reynolds number of 10,000, the experiments were carried out for blowing ratios ranging from 0.0 to 1.5. The local heat/mass transfer coefficients on the effusion plate are measured using a naphthalene sublimation method. The result indicates that the inclined jet causes the non-uniform and low heat/mass transfer compared to the vertical jet. At stagnation region, the peak position is shifted from the geometrical center of injection hole due to Coanda effect and its level is higher than that of vertical jet due to increase in turbulence intensity by steep velocity gradient near the stagnation region. Further, the secondary peak region disappears because the interaction between adjacent wall jets weakens. When the initial crossflow occurs, the distorted heat/mass transfer pattern appears. As the blowing ratio (crossflow rate) increases, the heat/mass transfer distributions become similar to those of the vertical jet. This is because the effect of crossflow is dominant compared to that of inclined jet under high blowing ratio $(M{\geq}1.0)$. At low blowing ratio $(M{\leq}0.5)$, averaged Sh value is 10% lower than that of vertical jet, whereas its value at high blowing ratio $(M{\geq}1.0)$ is similar to that of vertical jet.
Keywords
Impingement/Effusion Cooling; Heat/Mass Transfer; Inclined Jet; Initial Crossflow;
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Times Cited By KSCI : 2  (Citation Analysis)
Times Cited By SCOPUS : 0
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1 Lim, K. B., Lee, C. H. and Lee, S. H., 2006, 'A Study on the Heat Transfer Characteristics of Turbulent Round Jet Impinging on the Inclined Concave Surface Using Transient Liquid Crystal Method,' Trans. of KSME (B), Vol. 30, No. 7, pp. 656-662   DOI   ScienceOn
2 Rhee, D. H., Choi, J. H. and Cho, H. H., 2002, 'Flow and Heat (Mass) Transfer Characteristics in an Impingement/Effusion Cooling System with Cross flow,' J. of Turbomachinery, Vol. 125, pp. 74-82   DOI   ScienceOn
3 Diane, L., Bernhard W., Jens Von W., Stefan D. and Roland L., 2007, 'Heat Transfer Enhancement by Impingement Cooling in a Combustor Liner Heat Shield,' IGTI 2007, ASME Paper No. GT2007-27908
4 Ronald S. Bunker and Jeremy C. Bailey, 2005, 'Turbine Blade Platform Impingement Cooling with Effects of Film Extraction and Roughness,' IGTI 2005, ASME Paper No. GT2005-68415
5 Hollwarth, B. R., Lehmann, G. and Rosiczkowski, J., 1983, 'Arrays of Impinging Jets with Spent Fluid Removal Through Vent Holes on the Target Surface Part 2: Local Heat Transfer,' J. of Engineering for Power, Vol. 105, pp. 393-402   DOI
6 Cho, H. H. and Goldstein, R. J., 1996, 'Effect of Hole Arrangements on Impingement/ Effusion Cooling,' Proceeding of the 3rd KSME-JSME Thermal Engineering Conference, pp. 71-76
7 Yoon, P. H., Rhee, D. H. and Cho, H. H., 2001, 'Flow and Heat/Mass Transfer Characteristics of Arrays of Impingement Jets with Effusion Holes,' Trans. of KSME (B), Vol. 25, No. 11, pp. 1606-1615   과학기술학회마을
8 Golestein, R. J. and Franchett, M. E. 1988, 'Heat Transfer From a Flat Surface to an Oblique Impinging Jet,' J. of Heat Transfer, Vol. 110, pp. 84-90   DOI
9 Hong, S. K., Rhee, D. H. and Cho, H. H., 2005, 'Heat/Mass Transfer on Effusion Plate with Circular Pin Fins for Impingement/Effusion Cooling System with Intial Crossflow,' Trans. of KSME (B), Vol. 29, No. 7, pp. 828-836   과학기술학회마을
10 Rhee, D. H., Nam, Y. W. and Cho, H. H., 'Heat/Mass Transfer Characteristics on Rib-roughened Surface for Impingement/Effusion Cooling System with Initial Crossflow,' Trans. of KSME(B), Vol. 28, No. 3, pp. 338-348   과학기술학회마을
11 Eckert, E. R. G., 1976, 'Analogies to Heat Transfer Processes,' in Measurements in Heat Transfer, ed. Eckert, E. R. G. and Goldstein, R. J., pp. 397-423, Hemisphere Pub., New York
12 Abernethy, R. B., Benedict, R. P. and Dowdell, R. B. 1985, 'Measurement Uncertainty,' Journal of Fluid Engineering, Vol. 107, pp. 161-164   DOI
13 Goldstein, R. J. and Cho, H. H., 1995, 'A Review of Mass Transfer Measurement Using Naphthalene Sublimation,' Experimental Thermal and Fluid Science, Vol. 10, pp. 416-434   DOI   ScienceOn
14 Cho, H. H. and Rhee, D. H., 2001, 'Local Heat/Mass Transfer Measurement on the Effusion Plate in Impingement/Effusion Cooling System,' J. of Turbomachinery, Vol. 123, pp. 601-608   DOI