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Some measurements of particle velocity autocorrelation functions in a turbulent flow

Published online by Cambridge University Press:  29 March 2006

W. H. Snyder  and
J. L. Lumley
W. H. Snyder
Affiliation:
The Pennsylvania State University, University Park, Pennsylvania Present Address: Division of Meteorology, Environmental Protection Agency, Raleigh, North Carolina
J. L. Lumley
Affiliation:
The Pennsylvania State University, University Park, Pennsylvania
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Abstract

Particle velocity autocorrelations of single spherical beads (46·5 μhollow glass, 87 μ glass, 87 μ corn pollen, and 46·5 μ copper) were measured in a grid-generated turbulence. The hollow glass beads were small and light enough to behave like fluid points; the other types had significant inertia and ‘crossing trajectories’ effects. The autocorrelations decreased much faster for heavier particles, in contradiction to previous experimental results. The integral scale for the copper beads was 1/3 of that for the hollow glass beads. The particle velocity correlations and the Eulerian spatial correlation were coincident within experimental error when the separation was non-dimensionalized by the respective integral scale. The data generated by the hollow glass beads can be used to estimate Lagrangian fluid properities. The Lagrangian time integral scale is approximated by L/u′, where L is the Eulerian integral scale and u′ is the turbulence intensity.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 48 , Issue 1 , 13 July 1971 , pp. 41 - 71
Copyright
© 1971 Cambridge University Press

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