Author:
KHALILI A.,BASU A. J.,PIETRZYK U.,RAFFEL M.
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 set-up 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 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.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
17 articles.
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