Thermal collapse of a granular gas under gravity

Details Thermal collapse of a granular gas under gravity Thermal collapse of a granular gas under gravity

2006-05-25

arxiv.org/abs/cond-mat/0605634v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 12 eps figures, to appear in PRE

Scientific paper

10.1103/PhysRevE.73.061305

Free cooling of a gas of inelastically colliding hard spheres represents a central paradigm of kinetic theory of granular gases. At zero gravity the temperature of a freely cooling homogeneous granular gas follows a power law in time. How does gravity, which brings inhomogeneity, affect the cooling? We combine molecular dynamics simulations, a numerical solution of hydrodynamic equations and an analytic theory to show that a granular gas cooling under gravity undergoes thermal collapse: it cools down to zero temperature and condenses on the bottom of the container in a finite time.

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