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Flows of Granular Solids and Gases

Our work focuses on fundamental studies of granular and gas-solid flows with geophysical and industrial applications. We perform laboratory and field experiments, create numerical simulations, model fluid mechanics and heat transfer in these flows, and develop new instrumentation.

Recent news and activities

Visualize Michel Louge's presentation on the "Role of pore pressure gradients in geophysical flows over permeable substrates" at the Kavli Institute of Theoretical Physics in Santa Barbara during the conference on Fluid-Mediated Particle Transport in Geophysical Flows on Wednesday, December 18, 2014. The first part of the presentation concerns powders snow avalanches. The second discusses the role of the porous sand bed in desert ripples.

Here are links to Michel Louge's webcast seminar, presentation and abstract at the Isaac Newton Institute for Mathematical Sciences for the 2nd IMA conference on Dense Granular Flows on July 1, 2013. All videos of  presentations for this conference are available with this link.

A recent open access paper on temperature and humidity measurements within a mobile desert sand dune demarcates regions where microbes can survive and reports microscopic and respiration evidence of their presence.

Blog on our desert dune project, including expeditions to Mauritania (January 2011) and Qatar (March, June and November 2011, January, April, July, November 2012, April 2013, January and April 2014).

Experiments, numerical simulations and modeling of powder snow avalanches, which we identify with "eruption currents". See this page for explanations, recent progress and journal articles.

The following article points to recent progress by Mitrano et al (2014) on the subject of granular clusters: M.Y. Louge: "The surprising relevance of a continuum description to granular clusters," J. Fluid Mech. 742, 1-4 (2014), doi:10.1017/jfm.2013.650.

In the summer 2014, Michel Louge spent time as a Distinguished Visiting Fellow of the Royal Academy of Engineering working on deep-sea eruption currents with Dr. Barbara Turnbull at the University of Nottingham.

Jin Xu worked with Theis Solling at the Maersk Oil Research and Technology Center in Doha, Qatar carrying out CT scans of water and particles in July 2014.

For more information, contact Michel Louge at MYL3@cornell.edu


Summary

Our research has contributed to subjects as diverse as the scale-up of circulating fluidized beds under atmospheric and pressurized conditions; the behavior of pressurized cyclone separators; the interactions of gas and solid particles in pneumatic transport of particles; the impact of small solid spheres; the heat transfer in suspensions of gases and agitated solids; flows of grains on inclines; segregation and flow of grains in microgravity; mechanisms of particle interactions in confined agitated granular media; the water budget, dust inoculation, and seepage through desert sand dunes; and "eruption currents," which include powder snow avalanches.

We have also developed capacitance instrumentation that records solid concentration, velocity and water content in snow avalanches, fluidized suspensions, sand dunes and alpine snow packs

Applications of this research are found in Chemical Engineering (e.g., catalytic cracking, solids transport, solid combustion) and Geophysics (e.g., snow avalanches, desertification). Our experimental facilities have included a circulating fluidized bed, a large inclined chute, a flume, and a unique setup to record restitution and friction in the impacts of small spheres.

We conducted field experiments on NASA's microgravity airplane, in the Sahara desert, and in mountains.

ripple_capacitance

Michel Louge measures the density of sand at the surface of a barchan sand dune near Akjoujt in Mauritania.

Collaborators and Sponsors

We collaborate with the Universite de Rennes, the University of Nottingham, the Universite de Nantes, the Weill-Cornell Medical College in Qatar, the Biotechnology Centre of the Qatar Ministry of Environment, Maersk Oil in Qatar, the Ecole Polytechnique Federale de Lausanne, Tencate Geosynthetics, the Laboratoire 3SR of the Universite de Grenoble, DAMTP at the University of Cambridge, and the LGPM laboratory of the Ecole Centrale de Paris. Sponsors have included the NSF, the US DoE, NASA, ARO, Electricite de France, the International Fine Particle Research Institute, the ACS Petroleum Research Fund and the Qatar National Research Foundation.