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An experimental study of recirculating flow through fluid-sediment interfaces

Khalili, A. and Basu, A.J. and Pietrzyk, U. and Raffel, M. (1998) An experimental study of recirculating flow through fluid-sediment interfaces. Journal of Fluid Mechanics, 383, pp. 229-247.

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Abstract

We report here visualizations and quantitative measurements of scalar transport, under the influence of rotation, through permeable sediments with an overlying fluid layer. The experimental setup considered here is a stationary cylinder containing a fluid-saturated porous medium up to its midheight, with supernatant water on top. A rotating lid generates, in the upper fluid region, a flow that partially percolates into the porous layer below. The velocity field in the fluid layer is obtained using particle image velocimetry (PIV). Further, dye-transport from the sediment is studied using two different techniques. The first one is the positron emission tomography (PET), a non-invasive method which allowed us to 'see' through the opaque solid matrix, and to obtain full three-dimensional pictures of dye-transport through the sediment. The second one is digital photographic visualization from outside, and subsequent image processing in order to obtain the near-wall dye-washout depth. The experimental data suggest that the temporal evolution of washout depth for different sediments follows near-logarithmic behaviour. This finding is of importance for the a priori estimation of the transport of fluid and other solute substances in sandy aquatic sediments

Document Type:Article
Additional Information: LIDO-Berichtsjahr=1999,
Title:An experimental study of recirculating flow through fluid-sediment interfaces
Authors:
AuthorsInstitution or Email of Authors
Khalili, A.MPI for Marine Microbiology
Basu, A.J.Jawaharlal Nehru Center for Advanced Scientific Research
Pietrzyk, U.MPI for Neurological Research
Raffel, M.UNSPECIFIED
Date:1998
Journal or Publication Title:Journal of Fluid Mechanics
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:383
Page Range:pp. 229-247
Status:Published
Keywords:particle image velocimetry, positron emission tomography, temporal evolution of washout depth, sandy aquatic sediments
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L ST - Starrflüglertechnologien
DLR - Research theme (Project):UNSPECIFIED
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Strömungsmechanik
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 20:31

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