Flow and instabilities of particle-laden fluids
Valérie VIDAL
Laboratoire de Physique, CNRS, ENS de Lyon
Particle-laden fluids govern key processes such as sediment transport, gas/oil extraction and storage, or fluidized beds for industrial catalysis. The common point of these applications is the competition between fluid entrainment and particle sedimentation. This coupling can lead to puzzling fluid-escape structures, including fluid focalization and/or the emergence of instabilities. Although apparently innocuous, these structures are among the most threatening hazards, from industrial or offshore drilling incidents to the largest massive extinctions on Earth.
At the laboratory scale, we investigate the dynamics of an immersed granular layer submitted to a localized fluid injection. In a given range of parameters and for different experimental configurations, the system exhibits puzzling self-induced oscillations and/or unexpected violent particle resuspension. These curiosities at the laboratory scale may have a crucial impact in geophysical and environmental applications.
IMAGES
Recollision entre électrons en polarisation circulaire (plus de détails...)
CONFÉRENCES
New Challenges in Turbulence Research VII, École de Physique des Houches, 10 Février 2025
New Challenges in Turbulence Research VII, École de Physique des Houches, 10 Février 2025
New Challenges in Turbulence Research VII, École de Physique des Houches, 10 Février 2025