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An Investigation of Scalar Dispersion in Grid Turbulence

Dimotakis, P. E. and Lang, D. B. and Lombeyda, S. and Lindheim, J. (2007) An Investigation of Scalar Dispersion in Grid Turbulence. In: New Trends in Fluid Mechanics Research. Springer , Berlin, p. 7. ISBN 978-3-540-75994-2.

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The structure of scalar dispersion from a continuous release point was investigated for moderate Reynolds number flow in grid turbulence. Using laser-induced fluorescence techniques, laser-volume scanning, a custom-designed fast-readout CCD focal plane array, and high-speed digital-imaging/-acquisition/-storage techniques, the instantaneous three-dimensional structure of a passive scalar was investigated in flow in water (high Schmidt number). Laser Doppler and scalar-correlation velocimetry were employed to measure th flow speed entering the test section and in the interrogated volume. Such scalar-dispersion structure away from the release point is typically modeled assuming a Gaussian profile. This provides a good description for the mean scalar profile as a function of the transverse distance from a line parallel with the flow and downstream of the release point, as also confirmed by experiment (Yamamoto & Sato 1979, Gad-el-Hak & Morton 1979, Nakamura et al. 1987, Sawford 2001). The instantaneous three-dimensional structure, however, reveals a rich topology of scalar structures that was found to persist in the volume interrogated, spanning a distance from the grid and release point between 22 and 30 grid mesh lengths, which is in the self-similar grid-turbulence regime where the present three-dimensional scalar-field measurements were conducted.

Item Type:Book Section
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Additional Information:© 2007 Tsinghua University Press & Springer.
Subject Keywords:Fluid Mechanics; Release Point; Passive Scalar; Gaussian Profile; Transverse Distance
Record Number:CaltechAUTHORS:20190814-140334393
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97893
Deposited By: Tony Diaz
Deposited On:15 Aug 2019 17:36
Last Modified:16 Nov 2021 17:35

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