Submitted for the MAR10 Meeting of The American Physical Society Packing structure of cyclically sheared dense granular spheres ANDREEA PANAITESCU, ARSHAD KUDROLLI, Clark University — We characterize the structure of densely packed frictional granular spheres cyclically sheared between parallel walls under constant pressure boundary conditions with a fluorescent refractive index matched liquid ...

Based on experiments of the compaction of granular materials under periodic shear of a packing of glass beads, a minimal model for the dynamics of the packing density as a function of time is proposed. First, a random “energy landscape” is created by a random walk (RW) in energy. Second, an ensemble of RWs is performed for various temperatures in different temperature-time sequences. We identif...

We analyze the time dependent response of strongly scattering media (SSM) to ultra-short pulses of light. A random walk technique is used to model the optical scattering of ultra-short pulses of light propagating through media with random shapes and various packing densities. The pulse spreading was found to be strongly dependent on the average particle size, particle size distribution, and the...

Let X = {X(t), t ∈ RN} be a Gaussian random field with values in Rd defined by X(t) = ( X1(t), . . . , Xd(t) ) , ∀ t ∈ R , where X1, . . . , Xd are independent copies of a centered real-valued Gaussian random field X0. We consider the case when X0 is anisotropic and study the packing dimension of the range X(E), where E ⊆ RN is a Borel set. For this purpose we extend the original notion of pack...

We study photon diffusion in a two-dimensional random packing of monodisperse disks as a simple model of granular material. We apply ray optics approximation to set up a persistent random walk for the photons. We employ Fresnel's intensity reflectance with its rich dependence on the incidence angle and polarization state of the light. We present an analytic expression for the transport-mean-fre...

In a previous work, simple approach to derive the jamming packing fraction of hard-sphere mixture from knowledge random close-packing monocomponent system was proposed. Now, an extension that is applied provide approximate formula for densest given in terms fcc and single parameter encapsulating dependence on size ratios number spheres unit cell. Comparison with recent results such binary terna...

It remains an open question whether statistical mechanics approaches apply to random packings of athermal particles. Although a jamming phase diagram has recently been proposed for hard spheres with varying friction, here we use a frictionless emulsion system in the presence of depletion forces to sample the available phase space of packing configurations. Using confocal microscopy, we access t...

In many systems, the liquid flows in discrete rivulet/droplet form rather than continuous non-wetting or low flow rate conditions. A (DLF) theory has been used by a few researchers to describe these systems such as Ironmaking blast furnace. investigators have applied of structured packing where particles are arranged particular pattern void size and shape fixed. However, real world, system is r...

We generate jammed packings of monodisperse circular hard-disks in two dimensions using the Torquato-Jiao sequential linear programming algorithm. The packings display a wide diversity of packing fractions, average coordination numbers, and order as measured by standard scalar order metrics. This geometric-structure approach enables us to show the existence of relatively large maximally random ...

Title of thesis : Simulation of random packing of hard spheres using Monte Carlo method Sung-Ho Park, Master of Science in Mechanical Engineering, 1990 Thesis directed by : Dr.Anthony D. Rosato, Assistant Professor Mechanical Engineering Department. A computer based method of generating a random packing of hard spheres is described. Using a Monte Carlo method as employed in the field of Computa...