Thermal properties of an impurity immersed in a granular gas of rough hard spheres
1 Departamento de Física, Universidad de Extremadura, 06071 Badajoz, Spain
2 Instituto de Computación Científica Avanzada (ICCAEx), Universidad de Extremadura, 06071 Badajoz, Spain
3 G. Millán Institute, Fluid Dynamics, Nanoscience and Industrial Mathematics Department of Materials Science and Engineering and Chemical Engineering Universidad Carlos III de Madrid Leganés, Spain
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Published online: 30 June 2017
We study in this work the dynamics of a granular impurity immersed in a low-density granular gas of identical particles. For description of the kinetics of the granular gas and the impurity particles we use the rough hard sphere collisional model. We take into account the effects of non-conservation of energy upon particle collision. We find an (approximate) analytical solution of the pertinent kinetic equations for the single-particle velocity distribution functions that reproduces reasonably well the properties of translational/rotational energy non-equipartition. We assess the accuracy of the theoretical solution by comparing with computer simulations. For this, we use two independent computer data sets, from molecular dynamics (MD) and from Direct Simulation Monte Carlo method (DSMC). Both approach well, with different degrees, the kinetic theory within a reasonable range of parameter values.
© The Authors, published by EDP Sciences, 2017
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