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      Velocity-dependent restitution coefficient and granular cooling in microgravity

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      EPL (Europhysics Letters)
      IOP Publishing

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          Granular solids, liquids, and gases

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            Is Open Access

            A model for collisions in granular gases

            We propose a model for collisions between particles of a granular material and calculate the restitution coefficients for the normal and tangential motion as functions of the impact velocity from considerations of dissipative viscoelastic collisions. Existing models of impact with dissipation as well as the classical Hertz impact theory are included in the present model as special cases. We find that the type of collision (smooth, reflecting or sticky) is determined by the impact velocity and by the surface properties of the colliding grains. We observe a rather nontrivial dependence of the tangential restitution coefficient on the impact velocity.
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              Dynamics of a freely evolving, two-dimensional granular medium

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                Author and article information

                Journal
                EPL (Europhysics Letters)
                Europhys. Lett.
                IOP Publishing
                0295-5075
                1286-4854
                June 01 2009
                June 01 2009
                July 13 2009
                : 86
                : 6
                : 60007
                Article
                10.1209/0295-5075/86/60007
                1f6abf1e-fa79-498b-952c-e59429250fa9
                © 2009
                History

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