Abstract
The dissipative nature of the particle interactions in granular systems renders granular gases mesoscopic and bearing some similarities to regular gases in the “continuum transition regime” (where shear rates and/or thermalgradien ts are very large). The following properties of granular gases support the above claim: (i) Mean free times are of the same order as macroscopic time scales. (ii) Mean free paths can be macroscopic and comparable to the system’s dimensions. (iii) Typical flows are supersonic. (iv) Shear rates are typically “large”. (v) Stress fields are scale (resolution) dependent. (vi) Burnett and super-Burnett corrections to both the constitutive relations and the boundary conditions are of importance. It is concluded that while hydrodynamic descriptions of granular gases are relevant, they are probing the boundaries of applicability of hydrodynamics and perhaps slightly beyond.
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Goldhirsch, I. (2001). Granular Gases: Probing the Boundaries of Hydrodynamics. In: Pöschel, T., Luding, S. (eds) Granular Gases. Lecture Notes in Physics, vol 564. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-44506-4_4
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