Particle dispersion in a turbulent round jet

Ian M. Kennedy, Michael H. Moody

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Particle dispersion and particle velocities were measured with laser sheets and a position sensitive photomultiplier tube to track particles. Monodisperse hexadecane droplets were injected onto the centerline of a turbulent air jet. Their radial dispersion, axial velocities, and times of flight were measured as functions of axial position. The time and length scales of the jet were varied through the control of the jet exit velocity and nozzle diameter. Nozzle diameters of 7 and 12.6 mm were used. Reynolds numbers were in the range of 10 000-32 400. Two different droplet diameters were used viz., 60 and 90 μm. A significant range in the Kolmogorov, turbulent, and acceleration Stokes numbers was covered. The times-of-flight were used to analyze the dispersion measurements in terms of Lagrangian statistics. Dispersion data at long times of flight for a range of nozzle diameters, particle diameters and exit velocities were analyzed to obtain the Lagrangian particle diffusivity. The non-dimensional diffusivities or Peclet numbers were found to approach a value that was similar to the Eulerian Peclet number for scalar transport in a jet. Furthermore, the particle dispersion increased linearly with time at long times from their release in the jet.

Original languageEnglish (US)
Pages (from-to)11-26
Number of pages16
JournalExperimental Thermal and Fluid Science
Volume18
Issue number1
DOIs
StatePublished - Sep 1998

Fingerprint

Nozzles
Peclet number
Photomultipliers
Reynolds number
Statistics
Lasers
Air
n-hexadecane

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Mechanical Engineering

Cite this

Particle dispersion in a turbulent round jet. / Kennedy, Ian M.; Moody, Michael H.

In: Experimental Thermal and Fluid Science, Vol. 18, No. 1, 09.1998, p. 11-26.

Research output: Contribution to journalArticle

Kennedy, Ian M. ; Moody, Michael H. / Particle dispersion in a turbulent round jet. In: Experimental Thermal and Fluid Science. 1998 ; Vol. 18, No. 1. pp. 11-26.
@article{14efae957ab94cd29533117796aa781f,
title = "Particle dispersion in a turbulent round jet",
abstract = "Particle dispersion and particle velocities were measured with laser sheets and a position sensitive photomultiplier tube to track particles. Monodisperse hexadecane droplets were injected onto the centerline of a turbulent air jet. Their radial dispersion, axial velocities, and times of flight were measured as functions of axial position. The time and length scales of the jet were varied through the control of the jet exit velocity and nozzle diameter. Nozzle diameters of 7 and 12.6 mm were used. Reynolds numbers were in the range of 10 000-32 400. Two different droplet diameters were used viz., 60 and 90 μm. A significant range in the Kolmogorov, turbulent, and acceleration Stokes numbers was covered. The times-of-flight were used to analyze the dispersion measurements in terms of Lagrangian statistics. Dispersion data at long times of flight for a range of nozzle diameters, particle diameters and exit velocities were analyzed to obtain the Lagrangian particle diffusivity. The non-dimensional diffusivities or Peclet numbers were found to approach a value that was similar to the Eulerian Peclet number for scalar transport in a jet. Furthermore, the particle dispersion increased linearly with time at long times from their release in the jet.",
author = "Kennedy, {Ian M.} and Moody, {Michael H.}",
year = "1998",
month = "9",
doi = "10.1016/S0894-1777(98)10009-2",
language = "English (US)",
volume = "18",
pages = "11--26",
journal = "Experimental Thermal and Fluid Science",
issn = "0894-1777",
publisher = "Elsevier Inc.",
number = "1",

}

TY - JOUR

T1 - Particle dispersion in a turbulent round jet

AU - Kennedy, Ian M.

AU - Moody, Michael H.

PY - 1998/9

Y1 - 1998/9

N2 - Particle dispersion and particle velocities were measured with laser sheets and a position sensitive photomultiplier tube to track particles. Monodisperse hexadecane droplets were injected onto the centerline of a turbulent air jet. Their radial dispersion, axial velocities, and times of flight were measured as functions of axial position. The time and length scales of the jet were varied through the control of the jet exit velocity and nozzle diameter. Nozzle diameters of 7 and 12.6 mm were used. Reynolds numbers were in the range of 10 000-32 400. Two different droplet diameters were used viz., 60 and 90 μm. A significant range in the Kolmogorov, turbulent, and acceleration Stokes numbers was covered. The times-of-flight were used to analyze the dispersion measurements in terms of Lagrangian statistics. Dispersion data at long times of flight for a range of nozzle diameters, particle diameters and exit velocities were analyzed to obtain the Lagrangian particle diffusivity. The non-dimensional diffusivities or Peclet numbers were found to approach a value that was similar to the Eulerian Peclet number for scalar transport in a jet. Furthermore, the particle dispersion increased linearly with time at long times from their release in the jet.

AB - Particle dispersion and particle velocities were measured with laser sheets and a position sensitive photomultiplier tube to track particles. Monodisperse hexadecane droplets were injected onto the centerline of a turbulent air jet. Their radial dispersion, axial velocities, and times of flight were measured as functions of axial position. The time and length scales of the jet were varied through the control of the jet exit velocity and nozzle diameter. Nozzle diameters of 7 and 12.6 mm were used. Reynolds numbers were in the range of 10 000-32 400. Two different droplet diameters were used viz., 60 and 90 μm. A significant range in the Kolmogorov, turbulent, and acceleration Stokes numbers was covered. The times-of-flight were used to analyze the dispersion measurements in terms of Lagrangian statistics. Dispersion data at long times of flight for a range of nozzle diameters, particle diameters and exit velocities were analyzed to obtain the Lagrangian particle diffusivity. The non-dimensional diffusivities or Peclet numbers were found to approach a value that was similar to the Eulerian Peclet number for scalar transport in a jet. Furthermore, the particle dispersion increased linearly with time at long times from their release in the jet.

UR - http://www.scopus.com/inward/record.url?scp=0032172412&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032172412&partnerID=8YFLogxK

U2 - 10.1016/S0894-1777(98)10009-2

DO - 10.1016/S0894-1777(98)10009-2

M3 - Article

VL - 18

SP - 11

EP - 26

JO - Experimental Thermal and Fluid Science

JF - Experimental Thermal and Fluid Science

SN - 0894-1777

IS - 1

ER -