Measurements of turbulent diffusion in uniformly sheared flow
Measurements of turbulent diffusion in uniformly sheared flow
The diffusion of a plume of dye in uniformly sheared turbulent flow in a water tunnel was investigated using simultaneous stereoscopic particle image velocimetry (SPIV) and planar laser-induced fluorescence (PLIF). Maps of the mean concentration and the turbulent concentration fluxes in planes normal to the plume axis were constructed, from which all components of the second-order turbulent diffusivity tensor were determined for the first time. Good agreement between the corresponding apparent and true diffusivities was observed. The turbulent diffusivity tensor was found to have strong off-diagonal components, whereas the streamwise component appeared to be counter-gradient. The different terms in the advection–diffusion equation were estimated from the measurements and their relative significance was discussed. All observed phenomena were explained by physical arguments and the results were compared to previous ones
488-514
Vanderwel, Christina
fbc030f0-1822-4c3f-8e90-87f3cd8372bb
Tavoularis, Stavros
9800ff44-e983-4293-a2b1-f29eec90d359
September 2014
Vanderwel, Christina
fbc030f0-1822-4c3f-8e90-87f3cd8372bb
Tavoularis, Stavros
9800ff44-e983-4293-a2b1-f29eec90d359
Vanderwel, Christina and Tavoularis, Stavros
(2014)
Measurements of turbulent diffusion in uniformly sheared flow.
Journal of Fluid Mechanics, 754, .
(doi:10.1017/jfm.2014.406).
Abstract
The diffusion of a plume of dye in uniformly sheared turbulent flow in a water tunnel was investigated using simultaneous stereoscopic particle image velocimetry (SPIV) and planar laser-induced fluorescence (PLIF). Maps of the mean concentration and the turbulent concentration fluxes in planes normal to the plume axis were constructed, from which all components of the second-order turbulent diffusivity tensor were determined for the first time. Good agreement between the corresponding apparent and true diffusivities was observed. The turbulent diffusivity tensor was found to have strong off-diagonal components, whereas the streamwise component appeared to be counter-gradient. The different terms in the advection–diffusion equation were estimated from the measurements and their relative significance was discussed. All observed phenomena were explained by physical arguments and the results were compared to previous ones
Text
Vanderwel-Tavoularis-JFM-13-S-1193-R2.pdf
- Accepted Manuscript
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e-pub ahead of print date: 7 August 2014
Published date: September 2014
Organisations:
Aerodynamics & Flight Mechanics Group
Identifiers
Local EPrints ID: 371938
URI: http://eprints.soton.ac.uk/id/eprint/371938
ISSN: 0022-1120
PURE UUID: efe5151c-4b38-4bd3-8dd9-159c039f7333
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Date deposited: 21 Nov 2014 13:56
Last modified: 15 Mar 2024 03:50
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Author:
Stavros Tavoularis
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