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Characteristics of Turbulent Impinging and Wall Jet Flow for a Circular Nozzle with Various Exit Wall Thickness
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 Title & Authors
Characteristics of Turbulent Impinging and Wall Jet Flow for a Circular Nozzle with Various Exit Wall Thickness
Yang, Geun-Yeong; Yun, Sang-Heon; Son, Dong-Gi; Choe, Man-Su;
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An experimental study of impinging jet-flow structure has been carried out for a fully developed single circular jet impingement cooling on a flat plate, and the effect of the wall thickness at nozzle exit edge is investigated. Impinging jet flow structures have been measured by Laser-Doppler Velocimeter to interpret the heat transfer results presented previously by Yoon et al.(sup)(10) The peaks of heat transfer rate are observed near the nozzle edge owing to the radial acceleration of jet flow when the nozzle locates close to the impingement plate. The growth of the velocity fluctuations in the wall jet flow is induced by the vortices which originate in the jet shear layer, and consequently the radial distribution of local Nusselt numbers has a secondary peak at the certain radial position. As a wall of circular pipe nozzle becomes thicker for small nozzle-to-target distance, the entrainment can be inhibited, consequently, the acceleration of wall jet flow is reduced and the heat transfer rate decreases.
Impinging Jet Flow;Turbulent Wall Jet;Nozzle Wall Thickness;
 Cited by
Martin, H., 1977, 'Heat and Mass Transfer between Impinging Gas Jets and Solid Surface,' Advances in Heat Transfer,' Advances in Heat Transfer, Edited by J. P. Hartnett and T. F. Irvien, Jr., Academic Press, New York, pp. 1-60

Jambunathan, K., Lai, E., Moss, M. A. and Button, B. L., 1992, 'A Review of Heat Transfer Data for Single Circular Jet Impingement,' Int. J. Heat Fluid Flow, Vol. 13, pp. 106-115 crossref(new window)

Viskanta, R., 1993, 'Heat Transfer to Impinging Isothermal Gas and Flame Jets,' Exp. Thermal Fluid Science, Vol. 6, pp. 111-134 crossref(new window)

Gardon, R. and Akfirat, J. C., 1965, 'The Role of Turbulence in Determining the Heat - Transfer Characteristics of Impinging Jets,' Int. J. Heat Mass Transfer, Vol. 8, pp. 1261-1272 crossref(new window)

Donaldson, C. D., Snedeker, R. S. and Margolis, D. P., 1971, 'A Study of Free Jet Impingement. Part 2. Free Jet Turbulent Structure and Impingement Heat Transfer.' J. Fluid Mechanics, Vol. 45, pp. 477-512 crossref(new window)

Hoogendoorn, C. J., 1977, 'The Effect of Turbulence on Heat Transfer at a Stagnation Point,' Int. J. Heat Mass Transfer, Vol. 20, pp. 1333-1338 crossref(new window)

Cooper, D., Jackson, D. C., Launder, B. E. and Liao, G. X., 1993, 'Impinging jet Studies for Turbulence Model Assessment - I. Flow-Filed Experiments,' Int. J. Heat Mass Transfer, Vol. 36, pp. 2675-2684 crossref(new window)

Baughn, J. W. and Shimizu, S., 1989, 'Heat Transfer Measurements from a Surface with Uniform Heat Flux and an Impinging Jet,' J. Heat Transfer, Vol. 111, pp. 1096-1098

Lytle, D. and Webb, B. W., 1994, 'Air Jet Impingement Heat Transfer at Low Nozzle - Plate Spacings,' Int. J. Heat Mass Transfer, Vol. 37, pp. 1687-1697 crossref(new window)

윤상헌, 양근영, 손동기, 최만수, 1999, '원형 제트 충돌 열전달과 유동 특성에 관한 실험적 연구 : 노즐 벽 두께와 노즐 출구 압력의 영향,' 대한기계학회논문집 B권, 제 23권 제 10 호, pp. 1285-1295

Echols, W. H. and Young, J. A., 'Studies of Portable Air - Operated Aerosol Generator,' NRL Report 5929. Protective Chemistry Branch, Chemistry Division, U.S. Naval Research Laboratory

Schlichting, H., 1979, Boundary Layer Theory, 7th Edition, McGraw-Hill, New York