Particle dispersion in a turbulent round jet

Kennedy, Ian M.; Moody, Michael H.

doi:10.1016/s0894-1777(98)10009-2

Cited by 22 publications

(12 citation statements)

References 30 publications

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“…In this study the turbulent dispersion of particles in shear-dominated turbulent flows is studied. Measurements of particle dispersion in round turbulent jets was studied by Kennedy and Moody [15]. These measurements span a range of Reynolds and Stokes numbers, which were obtained by varying the jet velocity, nozzle diameter, and particle diameter.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of stochastic particle dispersion modeling in turbulent round jets

Sun

Hewson

Lignell

2017

International Journal of Multiphase Flow

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ODT (one-dimensional turbulence) simulations of particle-carrier gas interactions are performed in the jet flow configuration. Particles with different diameters are injected onto the centerline of a turbulent air jet. The particles are passive and do not impact the fluid phase. Their radial dispersion and axial velocities are obtained as functions of axial position. The time and length scales of the jet are varied through control of the jet exit velocity and nozzle diameter. Dispersion data at long times of flight for the nozzle diameter (7 mm), particle diameters (60 and 90 µm), and Reynolds numbers (10000 to 30000) are analyzed to obtain the Lagrangian particle dispersivity. Flow statistics of the ODT particle model are compared to experimental measurements. It is shown that the particle tracking method is capable of yielding Lagrangian prediction of the dispersive transport of particles in a round jet. In this paper, three particle-eddy interaction models (Type-I,-C, and-IC) are presented to examine the details of particle dispersion and particle-eddy interaction in jet flow.

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Section: Methodsmentioning

confidence: 99%

Evaluation of stochastic particle dispersion modeling in turbulent round jets

Sun

Hewson

Lignell

2017

International Journal of Multiphase Flow

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“…However, the influence of turbulent vortices cannot be ruled out entirely, since particles experience a wide range of Stokes numbers due to their wide size variation and variations in the flow field over the length studied. Kennedy and Moody [18] made a quantitative study of variations in the Stokes number used here, for a two phase jet without any particle size variation. They found it varied by about an order of magnitude over the flow field.…”

Section: Discussionmentioning

confidence: 99%

A Study of a Powder Coating Gun Near Field: Particle Flow in an Isothermal Staggered Concentric Air Jet

2014

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An experimental study of inert particle dispersion in an isothermal concentric air jet near field was conducted for cases of standard non-staggered and alternative staggered jet nozzles, each taken from a polymer powder flame deposition gun. The experimental work consisted of analysis of high speed digital images of the inert two phase isothermal jet flow, illuminated by a laser light sheet along and across the jet axis. The analysis of particle spread in the jet, represented by families of particle density distributions, clearly showed that the staggered nozzles resulted in a better-focused flow, with narrower distributions in the near field, and in the elimination of the recirculation zone that disrupted the particle flow in a non-staggered nozzle arrangement. In all cases, histograms of the cross-sectional particle area density were found to be approximately Gaussian. It was also found that there was a wide variation in the size and shape of the ground polymer particles used and these two characteristics caused a wide variation in the radial and axial velocities of the particles. Despite the differences between single-phase numerical simulations and experimental results, reported in Payne et al. [1], the introduction of particles into a numerical model produced satisfactory agreement with the particle velocities found experimentally.

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“…Currently, laser Doppler techniques are used for capturing velocity, particle distribution and size accurately such as laser-Doppler velocimeter (LDV), laser phase Doppler particle anemometer (PDPA), or Particle Image Velocimetry (PIV) [5][6][7].…”

Section: Experimental Techniquesmentioning

confidence: 99%

Numerical and experimental investigation of the morphology development of expansion clouds by a powder jet flow

Tang

Anjorin

Morgan

et al. 2004

Fire Safety Journal

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Explosion suppression is often the preferred method of explosion attenuation in industry. The morphology development of suppression clouds is important for the design of necessary coverage of the product. This paper presents a numerical and experimental investigation of the growth of powder dispersion as it expands from a discharge nozzle. A Lagrangian stochastic particle-tracking approach and the RNG k-ε turbulence model are adopted in the flow field solver for the dispersed and

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Particle dispersion in a turbulent round jet

Cited by 22 publications

References 30 publications

Evaluation of stochastic particle dispersion modeling in turbulent round jets

Evaluation of stochastic particle dispersion modeling in turbulent round jets

A Study of a Powder Coating Gun Near Field: Particle Flow in an Isothermal Staggered Concentric Air Jet

Numerical and experimental investigation of the morphology development of expansion clouds by a powder jet flow

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