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Large-scale structure in the far field of byoyant jets

Published online by Cambridge University Press:  26 April 2006

Dimitris Papantoniou  and
E. John List
Dimitris Papantoniou
Affiliation:
ETH - Hönggerberg, 8093 Zürich, Switzerland
E. John List
Affiliation:
California Institute of Technology, Pasadena, CA 91125, USA
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Abstract

The flow structure and entrainment mechanisms in the far field of a round vertical buoyant jet have been studied experimentally by use of an optical technique based on laser-induced fluorescence (LIF). A large number of essentially instantaneous tracer concentration profiles were recorded for each experimental run by combining LIF with linear photodiode array imaging and high-speed digital data acquisition. Analysis of the resulting high-resolution flow images indicates that the far-field region is dominated by the periodic passage of structures spanning the entire radial flow extent. Ambient fluid is entrained by vortical motions and is transported to regions deep into the flow interior. Correlation analysis discloses that the passage frequency of the structures scales with the local mean velocity and flow width. Conditional averaging of the data indicates that the downstream frontal region of the structure is well mixed and at higher concentration level than the back and side regions where ambient fluid is intermittently present. This results in an axial concentration gradient within the structure, analogous to the ramp-like pattern previously observed in heated air jets. In comparison to the momentum-driven flow the ambient fluid presence in the flow interior is greatly increased when body forces are the driving mechanism. This appears to result from the influence of buoyancy forces in the production of turbulent vortices at the integral scale. An important feature of both the momentum-driven and buoyancy-driven flows investigated is the strongly intermittent character of the concentration field. This raises the issue of the appropriateness of gradient-diffusion theories for the description of such flows.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 209 , December 1989 , pp. 151 - 190
Copyright
© 1989 Cambridge University Press

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References

Antonia, R. A., Prabhu, A. & Stephenson, S. E. 1975 Conditionally sampled measurement in a heated turbulent jet. J. Fluid Mech. 72, 455–480.Google Scholar
Batchelor, G. K. 1952 The effect of homogeneous turbulence on material lines and surface. Proc. R. Soc. Lond. A 213, 349.Google Scholar
Batchelor, G. K. 1959 Small scale variation of connected quantities of like temperature in turbulent fluid. Part 2. The case of large conductivity. J. Fluid Mech. 5, 134–139.Google Scholar
Becker, H. A., Hottel, H. C. & Williams, G. C. 1967 The nozzle-fluid concentration field of the round, turbulent, free jet. J. Fluid Mech. 30, 285–303.Google Scholar
Bernal, L. P. & Roshko, A. 1986 Streamwise vortex structure in plane mixing layers. J. Fluid Mech. 170, 499–525.Google Scholar
Birch, A. D., Brown, D. R., Dodson, M. G. & Thomas, J. R. 1978 The turbulent concentration field of a methane jet. J. Fluid Mech. 88, 431–449.Google Scholar
Breidenthal, R. E. 1981 Structure in turbulent mixing layers and wakes using a chemical reaction. J. Fluid Mech. 109, 1–24.Google Scholar
Broadwell, J. E. & Breidenthal, R. E. 1982 A simple model of mixing and chemical reaction in a turbulent shear layer. J. Fluid Mech. 125, 397–410.Google Scholar
Brown, G. L. & Roshko, A. 1974 On density effects and large structure in turbulent mixing layers. J. Fluid Mech. 64, 775–816.Google Scholar
Chen, C. J. & Rodi, W. 1980 Vertical Turbulent Buoyant Jets: A Review of Experimental Data. Pergamon.
Chevray, R. & Tutu, N. K. 1978 Intermittency and preferential transport of heat in a round jet. J. Fluid Mech. 88, 133–160.Google Scholar
Corrsin, S. & Kistler, A. L. 1955 NACA Rep. R-1244.
Corrsin, S. & Uberoi, M. S. 1950 Further experiments on the flow and heat transfer in a heated turbulent air jet. NACA Rep. 988.Google Scholar
Dahm, W. J. A. 1985 Experiments on entrainment, mixing and chemical reactions in turbulent jets at large Schmidt number. Ph.D. thesis, California Institute of Technology, Pasadena, California.
Dewey, C. F. 1976 Qualitative and quantitative flow field visualization utilizin laser-induced fluorescence. Proc. AGARD Conf. Appl. of Non-Intrusive Instrumentation in Fluid Flow Research, AGARD-CP-193.Google Scholar
Dimotakis, P. E., Miake-Lye, R. C. & Papantoniou, D. A. 1983 Structure and dynamics of round turbulent jets. Phys. Fluids 6, 3185.Google Scholar
Drake, M. C., Pitz, R. W. & Shyy, W. 1986 Conserved scalar probability density functions in a turbulent jet diffusion flame. J. Fluid Mech. 171, 27–51.Google Scholar
Effelsberg, E. & Peters, N. 1983 A composite model for the conserved scalar PDF. Combust. Flame 50, 351–360.Google Scholar
Fischer, H. B., List, E. J., Koh, R. C. Y., Imberger, J. & Brooks, N. H. 1979 Mixing in Inland and Coastal Wates. Academic.
Hannoun, I. & List, E. J. 1988 Turbulent mixing at a shear-free density interface. J. Fluid Mech. 189, 211–234.Google Scholar
Hinze, J. 1975 Turbulence. McGraw-Hill.
Hussain, A. K. M. F. 1986 Coherent structures and turbulence. J. Fluid Mech. 173, 303–356.Google Scholar
Jimenez, J., Cogollos, M. & Bernal, L. 1985 A perspective view of the plane mixing layer. J. Fluid Mech. 152, 125–143.Google Scholar
Komori, S. & Ueda, H. 1985 The large-scale coherent structure in the intermittent region of the self-preserving round free jet. J. Fluid Mech. 152, 337–360.Google Scholar
Konrad, J. H. 1976 An experimental investigation of mixing in two-dimensional turbulent shear flows with application to diffusion-limited chemical reactions. Ph.D. thesis, California Institute of Technology, Pasadena, California. (Also Project SQUID Tech. Rep. CIT-8-PU.)
Koochesfahani, M. M. 1984 Experiments on turbulent mixing and chemical reactions in a liquid mixing layer. Ph.D. thesis, California Institute of Technology, Pasadena, California.
Koochesfahani, M. M. & Dimotakis, P. E. 1986 Mixing and chemical reactions in a turbulent liquid mixing layer. J. Fluid Mech. 170, 83–112.Google Scholar
Kotsovinos, N. E. 1977 Plane turbulent buoyant jets. Part 2. Turbulent structure. J. Fluid Mech. 81, 45–62.Google Scholar
Kychakoff, G., Howe, R. D., Hanson, R. K. & Knapp, K. 1983 Flow visualization in combustion gases. AIAA Paper 83–0405, 21st Aerospace Sciences Meeting, January 1983.Google Scholar
List, E. J. 1982 Mechanics of turbulent buoyant jets and plumes. In Turbulent Buoyant Jets and Plumes (ed. W. Rodi), pp. 1–68. Pergamon.
Liu, H. T., Lin, J. T., Delisi, D. P. & Robben, F. A. 1977 Application of a fluoescence technique to dye-concentration measurements in a turbulent jet. NBS Special Pub. 484, in Proc. Symp. on Flow in Open Channels and Closed Conduits.Google Scholar
Middleton, J. H. 1975 The asymptotic behaviour of a starting plume. J. Fluid Mech. 72, 753–771.Google Scholar
Mungal, M. G. & Dimotakis, P. E. 1984 Mixing and combustion with low heat release in a turbulent shear layer. J. Fluid Mech. 148, 349–382.Google Scholar
Papanicolaou, P. N. & List, E. J. 1988 Investigations of round vertical turbulent buoyant jets. J. Fluid Mech. 195, 341–391.Google Scholar
Papantoniou, D. A. 1985 Observations in turbulent buoyant jets by use of laser-induced fluorescence. Ph.D. thesis, California Institute of Technology, Pasadena, California.
Pope, S. B. 1981 A Monte Carlo method for the PDF equations of turbulent reactive flow. Combust Sci. Tech. 25, 159–174.Google Scholar
Sawford, B. L. & Hunt, J. C. R. 1986 Effects of turbulence structure, molecular diffusion and source size on scalar fluctuations in homogenous turbulence. J. Fluid Mech. 165, 373–400.Google Scholar
Shlien, D. J. 1987 Observations of dispersion of entrained fluid in the self-preserving region of a turbulent jet. J. Fluid Mech. 183, 163–173.Google Scholar
Sreenivasan, K. R., Antonia, R. A. & Britz, K. 1979 Local isotropy and large structures in a heated turbulent jet. J. Fluid Mech. 94, 745–775.Google Scholar
Sreenivasan, K. R., Tavoularis, S. & Corrsin, S. 1981 A test of gradient transport and its generalizations. In Turbulent Shear Flows 3, pp. 96–112, Springer.
Toor, H. L. 1962 Mass transfer in dilute turbulent and non-turbulent systems with rapid irreversible reactions and equal diffusivities. AIChE J. 81, 70–78.Google Scholar
Townsend, A. A. 1976 The Structure of Turbulent Shear Flow. Cambridge University Press.
Uberoi, M. S. & Singh, P. I. 1975 Turbulent mixing in a two-dimensional jet. Phys. Fluids. 18, 764.Google Scholar
Walker, B. J. 1979 Turbulence model comparisons for shear layers and axisymmetric jets. US Army Missile Command Tech. Rep. RD-80-1.Google Scholar
Wygnanski, I. & Fiedler, H. 1969 Some measurements in the self-presserving jet. J. Fluid Mech. 38, 577–612.Google Scholar
Zaman, K. B. M. Q. & Hussain, A. K. M. F. 1984 Natural large scale structures in the axisymmetric mixing layer. J. Fluid Mech. 138, 325–351.Google Scholar