Granular Leidenfrost effect: experiment and theory of floating particle clusters.
Granular material is vertically vibrated in a 2D container: above a critical shaking strength, and for a sufficient number of beads, a crystalline cluster is elevated and supported by a dilute gaseous layer of fast beads underneath. We call this phenomenon the granular Leidenfrost effect. The experimental observations are explained by a hydrodynamic model featuring three dimensionless control parameters: the energy input S, the number of particle layers F, and the inelasticity of the particle collisions epsilon. The (S,F) phase diagram, in which the Leidenfrost state lies between the purely solid and gas phases, shows accurate agreement between experiment and theory.
Eshuis
Peter
P
Physics of Fluids Group, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
van der Weele
Ko
K
van der Meer
Devaraj
D
Lohse
Detlef
D
D003102:Colloids / Q000032:analysis / Q000737:chemistry*; D003198:Computer Simulation; D044085:Microfluidics / Q000379:methods*; D008956:Models, Chemical; D009038:Motion; D049329:Nanostructures / Q000032:analysis / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D044367:Phase Transition; D012996:Solutions
D003102:Colloids; D012996:Solutions