1. Resuspension threshold of a granular bed by localized heating
- Author
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Cyprien Morize, Eric Herbert, Alban Sauret, Fluides, automatique, systèmes thermiques (FAST), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire des Energies de Demain (LIED (UMR_8236)), Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Surface du Verre et Interfaces (SVI), Université Pierre et Marie Curie - Paris 6 (UPMC)-SAINT-GOBAIN-Centre National de la Recherche Scientifique (CNRS), AAP 'Attractivité Jeune chercheur' from Paris-Sud University, ANR-06-NEUR-0043,Presynaptic-CB1,Récepteurs présynaptique cannabinoïdes de type 1 (CB1): mécanismes et fonctions dans le cortex préfrontal.(2006), Centre National de la Recherche Scientifique (CNRS)-SAINT-GOBAIN-Université Pierre et Marie Curie - Paris 6 (UPMC), ANR-06-NEURO-0043,PRESYNAPTIC-CB1,Récepteurs présynaptique cannabinoïdes de type 1 (CB1): mécanismes et fonctions dans le cortex préfrontal.(2006), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Saint-Gobain-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Entrainment (hydrodynamics) ,[PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn] ,Materials science ,Buoyancy ,010504 meteorology & atmospheric sciences ,Fluids & Plasmas ,FOS: Physical sciences ,engineering.material ,01 natural sciences ,Mathematical Sciences ,010305 fluids & plasmas ,Physics::Fluid Dynamics ,Thermal conductivity ,Engineering ,Threshold temperature ,0103 physical sciences ,Thermal ,Density contrast ,0105 earth and related environmental sciences ,Fluid Dynamics (physics.flu-dyn) ,Mechanics ,Physics - Fluid Dynamics ,physics.flu-dyn ,Fluidized bed ,Physical Sciences ,engineering ,Dispersion (chemistry) - Abstract
International audience; The resuspension and dispersion of particles occur in industrial fluid dynamic processes as well as environmental and geophysical situations. In this paper, we experimentally investigate the ability to fluidize a granular bed with a vertical gradient of temperature. Using laboratory experiments with a localized heat source, we observe a large entrainment of particles into the fluid volume beyond a threshold temperature. The buoyancy-driven fluidized bed then leads to the transport of solid particles through the generation of particle-laden plumes. We show that the destabilization process is driven by the thermal conductivity inside the granular bed and demonstrate that the threshold temperature depends on the thickness of the granular bed and the buoyancy number, i.e., the ratio of the stabilizing density contrast to the destabilizing thermal density contrast.
- Published
- 2017
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