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Velocity measurements in a plane turbulent air jet at moderate Reynolds numbers

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Abstract

An experimental investigation of the moderate Reynolds number plane air jets was undertaken and the effect of the jet Reynolds number on the turbulent flow structure was determined. The Reynolds number, which was defined by the jet exit conditions, was varied between 1000 and 7000. Other initial conditions, such as the initial turbulence intensity, were kept constant throughout the experiments. Both hot-wire and laser Doppler anemometry were used for the velocity measurements. In the moderate Reynolds number regime, the turbulent flow structure is in transition. The average size and the number of the large scale of turbulence (per unit length of jet) was unaffected by the Reynolds number. A broadening of the turbulent spectra with increasing Reynolds number was observed. This indicated that there is a decrease in the strength of the large eddies resulting from a reduction of the relative energy available to them. This diminished the jet mixing with the ambient as the Reynolds number increased. Higher Reynolds numbers led to lower jet dilution and spread rates. On the other hand, at higher Reynolds numbers the dependence of jet mixing on Reynolds number became less significant as the turbulent flow structure developed into a self-preserving state.

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Abbreviations

b u :

velocity half-width of the jet

C u, C u,0 :

constants defining the velocity decay rate

D :

nozzle width

E u :

one dimensional power spectrum of velocity fluctuations

f :

frequency

K u, K u,0 :

constants defining the jet spread rate

k :

wavenumber (2πf/U)

L :

longitudinal integral scale

R 11 :

correlation function

r :

separation distance

Re :

jet Reynolds number (U 0 D/v)

St :

Strouhal number (fD/U 0)

t :

time

U :

axial component of the mean velocity

U m :

mean velocity on the jet axis

U 0 :

mean velocity at the jet exit

u :

the rms of u′

u′:

fluctuating component of the axial velocity

V :

lateral component of the mean velocity

ν′:

fluctuating component of the lateral velocity

x :

axial distance from the nozzle exit

y :

lateral distance from the jet axis

z :

spanwise distance from the jet axis

v :

kinematic viscosity

τ:

time lag

References

  • Albertson, M. L.; Dai, Y. B.; Jensen, R. A.; Rouse, H. 1950: Diffusion of submerged jets. Trans. Am. Soc. Civ. Eng. 115, 639–664

    Google Scholar 

  • Antonia, R. A.; Chambers, A. J.; Hussain, A. K. M. F. 1980: Errors in simultaneous measurements of temperature and velocity in the outer part of a heated jet. Phys. Fluids 23, 871–874

    Google Scholar 

  • Bashir, J.; Uberoi, M. S. 1975: Experiments on turbulent structure and heat transfer in a two-dimensional jet. Phys. Fluids 18, 405–410

    Google Scholar 

  • Beavers, G. S.; Wilson, T. A. 1970: Vortex growth in jets. J. Fluid Mech. 44, 97–112

    Google Scholar 

  • Bradbury, L. J. S. 1965: The structure of a self-preserving turbulent plane jet. J. Fluid Mech. 23, 31–64

    Google Scholar 

  • Brown, G. B. 1935: On vortex motion in gaseous jets and the origin of their sensitivity to sound. Proc. Phys. Soc. London 47, 703–732

    Google Scholar 

  • Chambers, F. W.; Goldschmidt, V. W. 1982: Acoustic interactions with a turbulent plane jet: effects on mean flow AIAA J. 20, 797–804

    Google Scholar 

  • Chambers, F. W.; Goldschmidt, V. W. 1983: Acoustic interactions with a turbulent plane jet: some effects on turbulence structure. AIAA J. 21, 1057–1058

    Google Scholar 

  • Corrsin, S.; Uberoi, M. 1949: Further experiments on the flow and heat transfer in a heated jet. NACA TN 1865

  • Crow, S. C.; Champagne, F. H. 1971: Orderly structure in jet turbulence. J. Fluid Mech. 48, 547–591

    Google Scholar 

  • Davis, A. E.; Keffer, J. F.; Baines, W. D. 1975: Spread of a heated plane turbulent jet. Phys. Fluids 18, 405–410

    Google Scholar 

  • Drubka, R. E. 1981: Instabilities in the near field of turbulent jets and their dependence on initial conditions and Reynolds number. Ph.D. Thesis, Illinois Institute of Technology, Chicago/IL, USA

    Google Scholar 

  • Drubka, R. E. 1983: Influence of initial condition on the development of turbulent jets. Paper AIAA-38-0287, presented at AIAA 21st Aerospace Sciences Meeting, Reno/NV, USA, January 10–13

  • Everrit, K. W.; Robins, A. G. 1978: The development and structure of turbulent jets. J. Fluid Mech. 88, 563–583

    Google Scholar 

  • Gardon, R.; Akfirat, J. C. 1965: The role of turbulence in determining the heat transfer characteristics of impinging jets. Int. J. Heat Mass Transfer 8, 1261–1272

    Google Scholar 

  • Gibson, M. M. 1963: Spectra of turbulence in a round jet. J. Fluid Mech. 15, 161–173

    Google Scholar 

  • Gibson, M. M.; Launder, B. E. 1976: On the calculation of horizontal turbulent shear flows under gravitational influence. Trans. ASME J. Heat Transfer, 75, 81–87

    Google Scholar 

  • Goldschmidt, V. W.; Bradshaw, P. 1981: Effects of nozzle exit turbulence on the spreading (or widening) rate of plane free jets. ASME Paper 81-FE-22, presented at the Joint ASME/ASCE Fluids Eng. and Appl. Mech. Conference, Boulder/CO, USA, June 22–24, 1981

  • Goldschmidt, V. W.; Moallemi, M. K.; Oler, J. W. 1983: Structures and flow reversal in turbulent plane jets. Phys. Fluids 26, 428–432

    Google Scholar 

  • Goldschmidt, V. W.; Young, M. F. 1975: Energy spectrum and turbulence scales in a plane air jet. Proc. of the 4th Biennial Symposium on Turbulence in Liquids, Rolla/MO, USA, p. 39

  • Gutmark, E.; Ho, C-M. 1983: Preferred modes and the spreading rates of jets. Phys. Fluids 26, 2932–2936

    Google Scholar 

  • Gutmark, E.; Wygnansky, I. 1976: The planar turbulent jet. J. Fluid Mech. 73, 465–495

    Google Scholar 

  • Hasan, M. A. Z.; Hussain, A. K. M. F. 1982: The self-excited axisymmetric jet. J. Fluid Mech. 115, 59–89

    Google Scholar 

  • Haskestad, G. 1965: Hot-wire measurements in a plane turbulent jet. Trans. ASME J. Appl. Mech. 32, 721–734

    Google Scholar 

  • Hill, W. G. Jr.; Jenkins, R. C.; Gilbert, B. L. 1976: Effects of the initial boundary layer state on turbulent jet mixing. AIAA J. 17, 1055–1060

    Google Scholar 

  • Hussain, A. K. M. F.; Clark, A. R. 1977: Upstream influence on the near field of a plane turbulent jet. Phys. Fluids 20, 1416–1427

    Google Scholar 

  • Jenkins, P. E.; Goldschmidt, V. W. 1973: Mean temperature and velocity in a plane turbulent jet. Trans. ASME J. Fluids Eng. 95, 581–584

    Google Scholar 

  • Ko, N. W. M.; Davies, P. O. A. L. 1971: The near field within the potential cone of subsonic cold jets. J. Fluid Mech. 50, 49–78

    Google Scholar 

  • Kotsovinos, N. E. 1975: A study of the entrainment and turbulence in a plane buoyant jet. Ph.D. Thesis, California Institute of Technology, Pasadena/CA, USA

    Google Scholar 

  • Kotsovinos, N. E. 1976: A note on the spreading rate and virtual origin of a plane jet. J. Fluid Mech. 77, 305–311

    Google Scholar 

  • Kotsovinos, N. E.; List, E. J. 1977: Plane turbulent buoyant jets, part 1: Integral Properties. J. Fluid Mech. 81, 25–44

    Google Scholar 

  • Knystautas, R. 1964: A turbulent jet from a series of holes in a line. Aeronaut. Q. 15, 1–28

    Google Scholar 

  • Kuhlman, J. M. 1985: Survey of nearfield Reynolds number effects and initial condition effects on buoyant and non-buoyant jets. ASME Paper, presented at the Int. Symp. on Modelling Environmental Flows, Albuquerque/NM, USA, June 24–26

  • Lau, J. C.; Morris, P. J.; Fisher, M. J. 1979: Measurements in subsonic and supersonic free jets using a laser velocimeter. J. Fluid Mech. 93, 1–27

    Google Scholar 

  • Lau, J. C.; Whiffen, M. C.; Fisher, M. J.; Smith, D. M. 1981: A note on turbulence measurements with a laser velocimeter. J. Fluid Mech. 102, 353–366

    Google Scholar 

  • Lemieux, G. P.; Oosthuizen, P. H. 1984: Experimental study of the behaviour of plane turbulent jets at low Reynolds numbers. Paper AIAA-84-1661, presented at the 17th Fluid Dynamics, Plasma Dynamics and Lasers Conference, Snow Mass/CO, USA, June 25–27

  • Lemieux, G. P.; Oosthuizen, P. H. 1985: Experimental study of the behaviour of plane turbulent jets at low Reynolds numbers. AIAA J. 23, 1845–1846

    Google Scholar 

  • Lepicovsky, J. 1986: Laser velocimeter measurements of large scale structures in a tone-excited jet. AIAA J. 24, 27–31

    Google Scholar 

  • Maestrello, L.; Bayliss, A. 1982: Flow-field acoustic amplification properties of heated and unheated jets. AIAA J. 20, 1539–1546

    Google Scholar 

  • Miller, D. R.; Comings, E. W. 1957: Static pressure distribution in a free turbulent jet. J. Fluid Mech. 3, 1–10

    Google Scholar 

  • Moore, C. J. 1977: The role of shear layer instability waves in jet exhaust noise. J. Fluid Mech. 80, 321–367

    Google Scholar 

  • Oosthuizen, P. H. 1983: An experimental study of low Reynolds number turbulent circular jet flow. ASME paper 83-FE-36, presented at ASME Applied Mechanics, Bioengineering and Fluids Engineering Conference, Houston/TX, USA, June 20–22

  • Ötügen, M. V. 1986: An investigation of the structure of moderate Reynolds number plane air jets. Ph.D. Thesis, Drexel University, Philadelphia/PA, USA

    Google Scholar 

  • Ötügen, M. V.; Namer, I. 1988: Rayleigh scattering temperature measurements in a plane turbulent air jet at moderate Reynolds numbers. Exp. Fluids 6 (in press)

  • Petersen, R. A. 1978: Influence of wave dispersion on vortex pairing in a jet. J. Fluid Mech. 89, 469–495

    Google Scholar 

  • Ramaprian, B. R.; Chandrasekhara, M. S. 1985: LDA measurements in plane turbulent jets. ASME paper 85-FE-9, presented at Joint ASME/ASCE Applied Mechanics, Bioengineering and Fluids Engineering Conference, Albuquerque/NM, USA, June 24–26

  • Ricou, F. Q.; Spalding, D. B. 1961: Measurements of entrainment by axisymmetric jets. J. Fluid Mech. 11, 21–32

    Google Scholar 

  • Rockwell, D. O.; Niccolls, W. O. 1972: Natural breakdown of planar jets. Trans. ASME J. Basic Eng. 94, 720–730

    Google Scholar 

  • Sato, H. 1959: The stability and transition of a two-dimensional jet. J. Fluid Mech. 7, 53–80

    Google Scholar 

  • Sfeir, A. A. 1979: Investigation of three dimensional turbulent rectangular jets. AIAA J. 17, 1055–1060

    Google Scholar 

  • Thomas, F. O.; Goldschmidt, V. W. 1986: Structural characteristics of a developing turbulent planar jet. J. Fluid Mech. 163, 227–256

    Google Scholar 

  • Van Der Hegge Zijnen, B. G. 1957: Measurements of the velocity distribution in a plane turbulent jet of air. Appl. Sci. Res. 7, 256–276

    Google Scholar 

  • Wygnansky, I.; Fiedler, H. E. 1969: Some measurements in the self-preserving jet. J. Fluid Mech. 38, 577–611

    Google Scholar 

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Authors and Affiliations

  1. Dept. of Mechanical Engineering and Mechanics, Drexel University, 19104, Philadelphia, PA, USA

    I. Namer & M. V. Ötügen

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  1. I. Namer
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  2. M. V. Ötügen
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Namer, I., Ötügen, M.V. Velocity measurements in a plane turbulent air jet at moderate Reynolds numbers. Experiments in Fluids 6, 387–399 (1988). https://doi.org/10.1007/BF00196484

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