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Uniform self-diffusion in a granular gas


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Opened Access Uniform self-diffusion in a granular gas

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Author: Brey Abalo, José Javier
Ruiz Montero, María José
Department: Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
Date: 2013
Published in: Physics of Fluids, 25 (11), 113302-.
Document type: Article
Abstract: A granular gas composed of inelastic hard spheres or disks in the homogeneous cooling state is considered. Some of the particles are labeled and their number density exhibits a time-independent linear profile along a given direction. As a consequence, there is a uniform flux of labeled particles in that direction. It is shown that the inelastic Boltzmann-Enskog kinetic equation has a solution describing this self-diffusion state. Approximate expressions for the transport equation and the distribution function of labeled particles are derived. The theoretical predictions are compared with simulation results obtained using the direct simulation Monte Carlo method to generate solutions of the kinetic equation. A fairly good agreement is found.
Cite: Brey Abalo, J.J. y Ruiz Montero, M.J. (2013). Uniform self-diffusion in a granular gas. Physics of Fluids, 25 (11), 113302-.
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DOI: 10.1063/1.4831978

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