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啞巴

Hydrodynamic Transport Coefficients of Granular Gasess to Navier-Stokes order are presented. The equations are derived by means of the Chapman-Enskog procedure. To test the existence of a normal solution and the possibility of a hydrodynamic description, the theoretical predictions are compared with numerical simulations of the underlying kinetic equa

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Granular Gases: Probing the Boundaries of Hydrodynamicses in the “continuum transition regime” (where shear rates and/or thermalgradien ts are very large). The following properties of granular gases support the above claim: (i) Mean free times are of the same order as macroscopic time scales. (ii) Mean free paths can be macroscopic and comparable to the

證實(shí)

Granular Gases with Impact-Velocity-Dependent Restitution Coefficientthat these conditions are not consistent with known collision laws. From the generalization of the Hertz contact law for viscoelastic particles we obtain the coefficient of normal restitution ∈ as a function of the normal component of the impact velocity ν.. Using ∈(ν.) we describe the time evolutio

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Diffusion Process in Two-Dimensional Granular Gasese. With periodic boundary conditions, the coefficient of diffusion is found to depend on the system size and does not saturate for large systems, which is of course not physical. The problem is solved by using reflecting boundaries. In that case, we find good agreement between numerical results and

營(yíng)養(yǎng)

Energy Loss and Aggregation Processes in Low Speed Collisions of Ice Particles Coated with Frosts orology. In this paper we review our measurements of the coefficient of restitution in low speed collisions for a variety of surface coatings, for speeds in the range 0.01- 2 cm/s, and also the investigations of sticking forces (under both dynamic and static conditions), including the conditions for w