Abstract
Starting from a recent derivation of the energy production rates in terms of the number of translational and rotational degrees of freedom, a comparative study on different granular temperatures in gas mixtures of inelastic and rough disks or spheres is carried out. Both the homogeneous freely cooling state and the state driven by a stochastic thermostat are considered. It is found that the relaxation number of collisions per particle is generally smaller for disks than for spheres, the mean angular velocity relaxing more rapidly than the temperature ratios. In the asymptotic regime of the undriven system, the rotational-translational nonequipartition is stronger in disks than in spheres, while it is hardly dependent on the class of particles in the driven system. On the other hand, the degree of component-component nonequipartition is higher for spheres than for disks, both for driven and undriven systems. A study of the mimicry effect (whereby a multicomponent gas mimics the rotational-translational temperature ratio of a monocomponent gas) is also undertaken.
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Acknowledgements
The research of A.S. has been supported by the Agencia Estatal de Investigación (Spain) through Grant No. FIS2016-76359-P and by the Junta de Extremadura (Spain) through Grant No. GR18079, both partially financed by Fondo Europeo de Desarrollo Regional funds.
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Megías, A., Santos, A. Driven and undriven states of multicomponent granular gases of inelastic and rough hard disks or spheres. Granular Matter 21, 49 (2019). https://doi.org/10.1007/s10035-019-0901-y
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DOI: https://doi.org/10.1007/s10035-019-0901-y