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Structure of a particle-laden round jet

  • Ellen K. Longmire (a1) and John K. Eaton (a2)

The interaction of solid particles with the temporal features of a turbulent flow has direct relevance to problems in particle and spray combustion and the processing of particulate solids. The object of the present study was to examine the behaviour of particles in a jet dominated by vortex ring structures. An axisymmetric air jet laden with 55 μm glass particles was forced axially with an acoustic speaker to organize the vortex ring structures rolling up in the free shear layer downstream of the nozzle exit. Visualization studies of forced and unforced flow with Reynolds number of the order of 20000 were completed using a pulsed copper vapour laser. Instantaneous photographs and videotapes of strobed forced flow show that particles become clustered in the saddle regions downstream of the vortex rings and are propelled away from the jet axis by the outwardly moving flow in these regions. Phase-averaged spatial distribution of particle number density computed from digitized photographs and phase-averaged particle velocity measurements yield further evidence that local particle dispersion and concentration are governed by convection due to large-scale turbulence structures. The large-scale structures and convection mechanisms were shown to persist for particle-to-air mass loading ratios up to 0.65.

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Chein, R. & Chung, J. N.1987Effects of vortex pairing on particle dispersion in turbulent shear flows. Intl J. Multiphase Flow13, 785802.

Crow, S. C. & Champagne, F. H. 1971 Orderly structure in jet turbulence. J. Fluid Mech. 48, 547591.

Crowe, C. T., Gore, R. & Troutt, T. R.1985Particle dispersion by coherent structures in free shear flows. Particulate Sci. Tech.3, 149158.

Fleckhaus, D., Hishida, K. & Maeda, M.1987Effect of laden solid particles on the turbulent flow structure of a round free jet. Exps Fluids5, 323333.

Hardalupas, Y., Taylor, A. M. K. P. & Whitelaw, J. H.1989Velocity and particle flux characteristics of turbulent particle-laden jets. Proc. R. Soc. Lond. A426, 3178.

Lazaro, B. J. & Lasheras, J. C.1989Particle dispersion in a turbulent plane shear layer. Phys. Fluids A1, 10351044.

Longmire, E. K., Eaton, J. K. & Elkins, C. J.1992Control of jet structure by crown-shaped nozzles. AIAA J.30 (to appear).

Mostafa, A. A., Mongia, H. C., McDonell, V. G. & Samuelsen, G. S.1989Evolution of particle-laden jet flows: a theoretical and experimental study. AIAA J.27, 167183.

Petersen, R. A. & Samet, M. M. 1988 On the preferred mode of jet instability. J. Fluid Mech. 194, 153173.

Squires, K. D. & Eaton, J. K. 1991 Measurements of particle dispersion obtained from direct numerical simulations of isotropic turbulence. J. Fluid Mech. 226, 135.

Yang, Y., Chung, J. N., Troutt, T. R. & Crowe, C. T.1990The influence of particles on the spatial stability of two-phase mixing layers. Phys. Fluids A2, 18391845.

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Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
  • URL: /core/journals/journal-of-fluid-mechanics
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