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Comparative Analysis of Turbulent Plane Jets from a Sharp-Edged Orifice, a Beveled-Edge Orifice and a Radially Contoured Nozzle

Authors: Ravinesh C. Deo

Abstract:

This article investigates through experiments the flow characteristics of plane jets from sharp-edged orifice-plate, beveled-edge and radially contoured nozzle. The first two configurations exhibit saddle-backed velocity profiles while the third shows a top-hat. A vena contracta is found for the jet emanating from orifice at x/h » 3 while the contoured case displays a potential core extending to the range x/h = 5. A spurt in jet pressure on the centerline supports vena contracta for the orifice-jet. Momentum thicknesses and integral length scales elongate linearly with x although the growth of the shear-layer and large-scale eddies for the orifice are greater than the contoured case. The near-field spectrum exhibits higher frequency of the primary eddies that concur with enhanced turbulence intensity. Importantly, highly “turbulent” state of the orifice-jet prevails in the far-field where the spectra confirm more energetic secondary eddies associated with greater flapping amplitude of the orifice-jet.

Keywords: orifice, beveled-edge-orifice, radially contoured nozzle, plane jets

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1336066

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References:


[1] H. Schlichting, Laminare strahlausbreitung, ZAMM 13 260, 1933.
[2] S. Amiri, M. Sandberg, B. Moshfegh, "Effect of Cooling Loads on Warm Plane Air Jet”, In Proc. The 5th International Conference on Air Distribution in Rooms, ROOMVENT '96. Yokohama, Japan, 1996.
[3] W. Quinn, "Development of a large-aspect ratio rectangular turbulent free jet”, AIAA J., vol 32(3), 1994.
[4] R.C. Deo, J. Mi, G.J. Nathan, "The influence of nozzle aspect ratio on plane jets”, Exp. Therm. Fluid. Sc., vol 31 (8) 825-833, 2007.
[5] G. Heskestad, "Hot-wire measurements in a plane turbulent jet”, Trans. ASME, J. Appl. Mech., vol 32, 721-734, 1965.
[6] L.J.S. Bradbury, "The structure of self-preserving turbulent planar jet”, J. Fluid Mech., vol 23, 31, 1965.
[7] E. Gutmark, I. Wygnanski, "The planar turbulent jet”, J. Fluid Mech., vol 73(3), 465–495, 1976.
[8] G.P Lemieux, P.H. Oosthuizen, "Experimental study of behaviour of planar turbulent jets at low Reynolds numbers”, AIAA J. 1845–1846, 1985.
[9] G.P. Lemieux, P.H. Oosthuizen, "Experimental study of the behaviour of plane turbulent air jets at low Reynolds numbers”, 17th Fluid Dynamics, Plasma Dynamics and Lasers Conference, Paper AIAA-84-1661, Snow Mass/Co, USA, 1–6, 1984.
[10] R.C. Deo, J. Mi, G.J. Nathan, "The influence of nozzle-exit geometric profile on statistical properties of a turbulent plane jet,” Exp. Therm. Fluid Sci. 32, 545, 2007.
[11] W.K. George, "Some new ideas for similarity of turbulent shear flows”, In Proc. ICHMT Symposium on Turbulence, Heat and Mass Transfer, Lisbon, Portugal (1994), edited by K. Hanjalic and J. C. F. Pereira Begell, New York, 1995.
[12] J. Mi, G.J. Nathan, D.S. Nobes, "Mixing characteristics of axisymmetric free jets from a contoured nozzle, an orifice plate and a pipe”, J. Fluid. Eng. 123, 878–883, 2001.
[13] J. Mi, D.S. Nobes, G.J. Nathan, "Influence of jet exit conditions on the passive scalar field of an axisymmetric free jet”, J. Fluid Mech. 432, 91–125, 2001.
[14] R.C. Deo, "Experimental investigations of the influence of Reynolds number and boundary conditions on a plane air jet”, Ph.D. thesis, The University of Adelaide, Australia, 2005. Available at Australian Digital Thesis Program, http://thesis.library.adelaide.edu.au/public/adt-SUA20051025.054550/index.html
[15] F.C. Lockwood, A. Moneib, Fluctuating Temperature Measurements in a Heated Round Free Jet, Combust. Sci. Technol., 22, 63–81, (1980).
[16] W.R. Quinn, "Upstream shaping effects on near field flow in round turbulent free jets”. Euro. J. Mech. B/Fluids, 25 (3), 279-301, 2006.
[17] W.R. Quinn, "Experimental study of the near field and transition region of a free jet issuing from a sharp-edged elliptic orifice plate”, Euro. J. Mech. B/Fluids, 26(4), 583-614, 2007.
[18] R. C. Deo, J. Mi, and G. J. Nathan, "Comparison of turbulent jets issuing from rectangular nozzles with and without sidewalls,” Experimental Thermal and Fluid Sciences, vol 32, pp 596, 2007.
[19] H.H. Brunn, Hot Wire Anemometry: Principles and Signal Analysis, Oxford Press, (1995).
[20] P. Bradshaw, An Introduction to Turbulence and Its Measurements, Pergamon, 1971.
[21] F.H. Champagne, "The fine-scale structure of the turbulent velocity field”, J. Fluid Mech. 86(1), 67–108, 1978.
[22] J. Tan-Atichat, W.K. George, S. Woodward, Use of Data Acquisition and Processing: Handbook of Fluids and Fluids Engineering, Vol. 3, Wiley, 1996.
[23] Y. Tsuchiya, C. Horikoshi, T. Sato, "On the spread of rectangular jets”, Exp. Fluids 4, 197–204, 1985.
[24] C.M. Ho, E.J. Gutmark, "Vortex Induction and Mass Entrainment in a Small-Aspect Ratio Elliptic Jet”, J. Fluid Mech., 179, 383–405, 1987.
[25] H.S. Husain, A.K.M.F. Hussain, "Controlled excitation of elliptic jets”, Phys. Fluids, vol 26, 2763, 1983.
[26] J.C. Mumford, "The structures of large eddies in fully developed shear flows. Part 1. The plane jet”., J. Fluid Mech., vol 118, 241–268, 1982.
[27] A.K.M.F. Hussain, A.R. Clark, "Upstream influence on the near field of a planar turbulent jet”, Phys. Fluids, vol 20(9), 1977.
[28] H. Sato, "The stability and transition of a two-dimensional jet”, J. Fluid Mech., vol 7, 53, 1960.
[29] F.O. Thomas, V.W. Goldschmidt, "Structural characteristics of a developing turbulent planar jet”, J. Fluid Mech. 163, 227, (1986).
[30] P.R. Suresh, K. Srinivasan, T. Sundararajan, K. Das Sarit, "Reynolds number dependence of plane jet development in the transitional regime”, Phys. Fluids, vol 20(4), 044105-12, 2008.
[31] D.O. Rockwell, W.O. Niccolls, "Natural breakdown of planar jets”, ASME J. Basic Eng., vol 94, 720, 1972.
[32] F.O. Thomas, K.M.K. Prakash, "An experimental investigation of the natural transition of an untuned planar jet”, Phys. Fluids, vol A3, 90, 1991.
[33] A.K.M. F. Hussain, "Coherent structures and turbulence”, J. Fluid Mech., vol 173, 303, 1986.
[34] G.B. Brown, "On vortex motion in gaseous jets and origin of their sensitivity in sound”, In Proc. Phys. Soc. London, vol 47, 703–732, 1935.
[35] G.S. Beavers, T.A. Wilson, "Vortex growth in jets”, J. Fluid Mech. 44 (1) 97–112, 1970.
[36] L. Biferale, M. Vergassola, "Isotropy vs. anisotropy in small-scale turbulence”, Phys. Fluids, vol 13, 2139, 2001.
[37] N. Kolmogorov, "Local structure of turbulence in an incompressible viscous fluid at very high Reynolds numbers”, Dokl. Akad. Nauk SSSR 30, 299, 1941.
[38] R.A. Antonia, W.B. Browne, S. Rajagopalan, A.J. Chambers, "On organized motion of a turbulent planar jet”, J. Fluid Mech., vol 134, 49, 1983.
[39] R. C. Deo, J. Mi, and G. J. Nathan, "The influence of Reynolds number on a plane jet,” Physics of Fluids, vol 20 (7), pp 075108-1, 2008.