Thermal diffusion segregation of an impurity in a driven granular fluid

Journal Article · Tue Dec 09 04:00:00 EST 2014 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4902633· OSTI ID:22390568

Reyes, Francisco Vega; Garzó, Vicente ^[1]

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1. Departamento de Física, Universidad de Extremadura, E-06071 Badajoz, Spain and Instituto de Computación Científica Avanzada (ICCAEx), Universidad de Extremadura, E-06071 Badajoz (Spain)

We study segregation of an impurity in a driven granular fluid under two types of steady states. In the first state, the granular gas is driven by a stochastic volume force field with a Fourier-type profile while in the second state, the granular gas is sheared in such a way that inelastic cooling is balanced by viscous heating. We compare theoretical results derived from a solution of the (inelastic) Boltzmann equation at Navier-Stokes (NS) order with those obtained from the Direct Monte Carlo simulation (DSMC) method and molecular dynamics (MD) simulations. Good agreement is found between theory and simulation, which provides strong evidence of the reliability of NS granular hydrodynamics for these steady states (including the dynamics of the impurity), even at high inelasticity. In addition, preliminary results for thermal diffusion in granular fluids at moderate densities are also presented. As for dilute gases, excellent agreement is also found in this more general case.

• OSTI ID: 22390568
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1628; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BOLTZMANN EQUATION
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
GASES
HEATING
HYDRODYNAMICS
MATHEMATICAL SOLUTIONS
MOLECULAR DYNAMICS METHOD
MONTE CARLO METHOD
NAVIER-STOKES EQUATIONS
RELIABILITY
SEGREGATION
SHEAR
STEADY-STATE CONDITIONS
STOCHASTIC PROCESSES
THERMAL DIFFUSION