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Simulation of particle dispersion in an axisymmetric jet

Published online by Cambridge University Press:  21 April 2006

J. N. Chung  and
T. R. Troutt
J. N. Chung
Affiliation:
Department of Mechanical Engineering, Washington State University, Pullman, WA 99164-2920, USA
T. R. Troutt
Affiliation:
Department of Mechanical Engineering, Washington State University, Pullman, WA 99164-2920, USA
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Abstract

Particle dispersion in an axisymmetric jet is analysed numerically by following particle trajectories in a jet flow simulated by discrete vortex rings. Important global and local flow quantities reported in experimental measurements are successfully simulated by this method.

The particle dispersion results demonstrate that the extent of particle dispersion depends strongly on γτ, the ratio of particle aerodynamic response time to the characteristic time of the jet flow. Particles with relatively small γτ values are dispersed at approximately the fluid dispersion rate. Particles with large γτ values are dispersed less than the fluid. Particles at intermediate values of γτ may be dispersed faster than the fluid and actually be flung outside the fluid mixing region of the jet. This result is in agreement with some previous experimental observations. As a consequence of this analysis, it is suggested that there exists a specific range of intermediate γτ at which optimal dispersion of particles in the turbulent mixing layer of a free jet may be achieved.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 186 , January 1988 , pp. 199 - 222
Copyright
© 1988 Cambridge University Press

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