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Jet diffusion from a circular nozzle above a solid plane

Published online by Cambridge University Press:  19 April 2006

M. R. Davis  and
H. Winarto
M. R. Davis
Affiliation:
School of Mechanical and Industrial Engineering, University of New South Wales, Kensington, Australia 2033
H. Winarto
Affiliation:
Department of Mechanical Engineering, University of Queensland, St Lucia, Australia 4067
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Abstract

The decay of a jet discharging from a circular nozzle parallel to and displaced from a solid surface is investigated under conditions where the transitional process from circular-jet flow to oblate wall-jet flow begins in the initial, transition or self-preserving regions of the original jet. The influence of displacement of the nozzle from the plane on the developed three-dimensional wall jet downstream is demonstrated and it is found that the transitional interaction with the plane is more extended when the plane interacts first in the initial zone of the circular jet. Measurements of turbulence and Reynolds stress show the transverse mixing parallel to the plane to exceed that perpendicular to the plane, and are generally consistent with the spreading rates in these two directions, the ratio of which approaches 8·5 at large distances from the nozzle. It is shown that the interaction between the plane and jet involves a relatively large-scale coherent motion in which components of velocity directed towards or away from the surface are associated with outflow or inflow along the surface. This motion is more extended in the direction parallel to the surface and provides a mechanism for the increases in mixing rate in the direction parallel to the plane.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 101 , Issue 1 , 13 November 1980 , pp. 201 - 221
Copyright
© 1980 Cambridge University Press

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References

Bradshaw, P., Ferris, D. H. & Johnson, R. F. 1964 Turbulence in the noise-producing region of a circular jet. J. Fluid Mech. 19, 591–624.Google Scholar
Corrsin, S. 1943 Investigation of flow in an axially symmetric heated jet of air. N.A.C.A. Wartime Rep. W-94.Google Scholar
Davies, P. O. A. L., Davis, M. R. & Wold, I. 1966 Operation of the constant-resistance hotwire anemometer. Inst. of Sound and Vibration Res., Univ. Southampton, Rep. no. 189.Google Scholar
Davies, P. O. A. L., Fisher, M. J. & Barratt, M. J. 1963 The characteristics of the turbulence in the mixing region of a round jet. J. Fluid Mech. 15, 337–367.Google Scholar
Davis, M. R. 1970 The dynamic response of constant resistance anemometers. J. Physics. E, Sci. Instrum. 3, 15–20.Google Scholar
Davis, M. R. 1971 Measurements in a Subsonic Turbulent Jet Using a Quantitative Schlieren Technique. J. Fluid Mech. 4, 631–656.Google Scholar
Davis, M. R. & Davies, P. O. A. L. 1972 Factors influencing the heat transfer from cylindrical anemometer probes. Int. J. Heat Mass Transfer 15, 1659–1677.Google Scholar
Görtler, H. 1942 Berechnung von Aufgaben der freien Turbulenz auf Grund eines neuen Naherungsansatzes. Z. angew. Math. Mech. 22, 244–254.Google Scholar
Morrison, G. L., Perry, A. E. & Samuel, A. E. 1972 Dynamic calibration of inclined and crossed wires. J. Fluid Mech. 52, 465–474.Google Scholar
Myers, G. E., Schauer, J. J. & Eustis, R. H. 1963 The plane turbulent wall jet. Trans. A.S.M.E. I, J. Basic Engng 85, 47–54.Google Scholar
Newman, B. G., Patel, R. P., Savage, S. B. & Tjio, H. K. 1972 Three Dimensional Wall Jet Originating from a Circular Orifice. Aero. Quart. 23, 188–200.Google Scholar
Rajaratnam, N. 1976 Turbulent Jets. Elsevier.
Rajaratnam, N. & Pani, B. S. 1972 Three-dimensional turbulent wall jets. Proc. A.S.C.E., J. Hydraulics Div. 98, 1101–1115.Google Scholar
Sigalla, A. 1958 Measurements of skin friction in a plane turbulent wall jet. J. Roy. Aero. Soc. 62, 873–877.Google Scholar
Tollmien, W. 1926 Berechnung turbulenter Ausbrctungsvorgänge. Z. angew. Math. Mech. 6, 468–478. (Also 1945 N.A.C.A. TM 1085.)Google Scholar
Trupel, T. 1915 Uber die Einwirkung eines Luftsrahles auf die umgebende Luft. Z. gesamonte Turbinen. 5–6.Google Scholar
Wygnanski, I. & Fiedler, H. 1969 Some measurements in the self-preserving jet. J. Fluid Mech. 38, 577–612.Google Scholar