Dynamics of the wet granular Leidenfrost phenomenon

摘要

By event-driven molecular dynamics simulations, we study the Leidenfrost effect for wet granular matterndriven from below. In marked contrast to all earlier studies on other fluids, the dense plug hovering on the hotngas cushion undergoes an undamped oscillation. The location of the Hopf bifurcation leading to this oscillationnis strongly dependent on the inelasticity of the grain impacts. The vertical separation into a gas phase withna condensed plug hovering above it is particularly pronounced due to the cohesiveness of the granulate. Fornsufficiently large system sizes, the Rayleigh-Taylor instability terminates the oscillatory state at late times.