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The effect of a steady drift on the dispersion of a particle in turbulent fluid

Published online by Cambridge University Press:  19 April 2006

A. Nir  and
L. M. Pismen
A. Nir
Affiliation:
Department of Chemical Engineering, Technion-Israel Institute of Technology, Haifa, Israel
L. M. Pismen
Affiliation:
Department of Chemical Engineering, Technion-Israel Institute of Technology, Haifa, Israel
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Abstract

The effect of a steady deterministic drift on the dispersion of particles suspended in a stationary homogeneous turbulent field is examined using previously reported closed equations of the mean-squared particle displacement. The existence of negative particle velocity correlations is demonstrated. The dependence of the particle diffusivity and kinetic energy on the inertia and drift factors is evaluated for a model turbulence spectrum. Asymptotic formulae are obtained for the case of dominant deterministic motion. The theory is applied to analysis of the experimental data of Snyder & Lumley (1971), and good and consistent agreement with these asymptotic formulae was obtained after accounting for the quasi-stationarity of particle velocity correlation functions in decaying turbulence.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 94 , Issue 2 , 25 September 1979 , pp. 369 - 381
Copyright
© 1979 Cambridge University Press

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