Progress in rheology and hydrodynamics allowed by NMR or MRI technique
Mercredi 9 décembre, 18h
Webinar: Progress in rheology and hydrodynamics allowed by NMR or MRI techniques
Laboratoire Navier, Univ Gustave Eiffel, France
In modern fluid mechanics it has become common to attempt to observe internal flow characteristics even in non-transparent materials. Nuclear magnetic resonance (NMR) offers a wide range of possibilities of non-destructive measurements inside such materials. Indeed, by exciting differently different areas (which leads to magnetic resonance imaging (MRI)), NMR allows to get various information on the physical characteristics of the system at a local scale, such as the liquid content and the displacement or velocity of the liquid molecules, through local or statistical measurements. Moreover, since the relaxation of the signal is affected by the interactions of the liquid with its environment, NMR offers the possibility to determine the liquid state and estimate the pore size or shape in which the liquid lies, or the concentration of suspended elements in a liquid. This presentation will start by a brief overview of the basic technical elements allowing to understand the principles of the technique, its versatility to measure various flow and material characteristics, and the technical difficulties (and costs) inherent to this technique. We will then review applications of NMR in complex flows, rheology of complex fluids, flow in porous media, colloid transport, fluid transfers in complex porous systems, etc, with a special emphasis on approaches which definitely go beyond basic qualitative imaging to effectively provide a progress in our physical understanding of the phenomena.
Inscription : http://pcwww.liv.ac.uk/~robpoole/jnnfm/jnnfm_seminar.htm