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Master 2: International Centre for Fundamental Physics INTERNSHIP PROPOSAL (One page maximum) Laboratory name: Laboratoire de Physique des Solides CNRS identification code: 8502 Internship director’s name: Salonen Anniina E-mail: [email protected] Phone number: 01 69 15 53 88 Web page: https://www.equipes.lps.u-psud.fr/sil/ Internship location: Laboratoire de Physique des Solides, bâtiment 510, Université Paris Sud, 91405 Orsay Thesis possibility after internship: NO Instability or a flux argument – which controls sedimentation in capillaries? Particles that are heavier than the solvent in which they are suspended in sediment, they flow down to the bottom of the recipient. This can be a nuisance, but it is a useful way to separate material in industrial processes, and it also responsible in Nature for the river delta formations for example. Due to the large number of particles interacting via a fluid, the sedimentation process is complicated. We have previously studied the sedimentation of solid particles in small glass capillaries 1, where the proximity of walls (confinement) can influence the process. We have since started working on the problem of sedimentation starting from a homogenous block, as seen in the Figure below. In this case, depending on how compact the sediment is it can melt like a solid or destabilize like a fluid. In the case of a fluid destabilization, as seen in the Figure below the process resembles closely at a Rayleigh-Taylor instability. Once the flow has stabilized and reached a steady state the transport of particles can be followed. The results of the preliminary experiments suggest two possibilities for fixing the rate of particle transport: 1) It is set by the initial instability or 2) The sedimentation proceeds as fast as possible. The aim of the internship is to show which of these possibilities is correct (or that it is neither and a 3rd option that we have not imagined). There are also possibilities to study the process in inclined capillaries, where the process resembles more that of granular flow on inclined planes. We are looking for a careful and enthusiastic experimentalist, who is happy to discuss with theoreticians with whom we collaborate and to work as a part of an international team. [1] S. Heitkam, Y. Yoshitake, F. Toquet, D. Langevin, A. Salonen, PRL, 110, 178302 (2013) Please, indicate which speciality(ies) seem(s) to be more adapted to the subject: Condensed Matter Physics: YES Quantum Physics: NO Macroscopic Physics and complexity: YES Theoretical Physics: NO