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. https://resolver.caltech.edu/CaltechAUTHORS:20190814-140334393
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Abstract
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. | |||||||||
Group: | GALCIT | |||||||||
Subject Keywords: | Fluid Mechanics; Release Point; Passive Scalar; Gaussian Profile; Transverse Distance | |||||||||
DOI: | 10.1007/978-3-540-75995-9_2 | |||||||||
Record Number: | CaltechAUTHORS:20190814-140334393 | |||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20190814-140334393 | |||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
ID Code: | 97893 | |||||||||
Collection: | CaltechAUTHORS | |||||||||
Deposited By: | Tony Diaz | |||||||||
Deposited On: | 15 Aug 2019 17:36 | |||||||||
Last Modified: | 16 Nov 2021 17:35 |
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