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• W2036762635 abstract "The prototype model of a fluidized granular system is a gas of inelastic hard spheres (IHS) with a constant coefficient of normal restitution $ensuremath{alpha}$. Using a kinetic theory description we investigate the two basic ingredients that a model of elastic hard spheres (EHS) must have in order to mimic the most relevant transport properties of the underlying IHS gas. First, the EHS gas is assumed to be subject to the action of an effective drag force with a friction constant equal to half the cooling rate of the IHS gas, the latter being evaluated in the local equilibrium approximation for simplicity. Second, the collision rate of the EHS gas is reduced by a factor $frac{1}{2}(1+ensuremath{alpha})$, relative to that of the IHS gas. Comparison between the respective Navier-Stokes transport coefficients shows that the EHS model reproduces almost perfectly the self-diffusion coefficient and reasonably well the two transport coefficients defining the heat flux, the shear viscosity being reproduced within a deviation less than 14% (for $ensuremath{alpha}ensuremath{geqslant}0.5$). Moreover, the EHS model is seen to agree with the fundamental collision integrals of inelastic mixtures and dense gases. The approximate equivalence between IHS and EHS is used to propose kinetic models for inelastic collisions as simple extensions of known kinetic models for elastic collisions." @default.
• W2036762635 created "2016-06-24" @default.
• W2036762635 creator A5037149678 @default.
• W2036762635 creator A5039400155 @default.
• W2036762635 date "2005-09-30" @default.
• W2036762635 modified "2023-09-27" @default.
• W2036762635 title "System of elastic hard spheres which mimics the transport properties of a granular gas" @default.
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• W2036762635 doi "https://doi.org/10.1103/physreve.72.031308" @default.
• W2036762635 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16241427" @default.
• W2036762635 hasPublicationYear "2005" @default.
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