English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Velocity and density structure factors are measured over a hydrodynamic rangeof scales in a horizontal quasi-2d fluidized granular experiment, with packingfractions $\phi\in[10%,40%]$. The fluidization is realized by verticallyvibrating a rough plate, on top of which particles perform a Brownian-likehorizontal motion in addition to inelastic collisions. On one hand, the densitystructure factor is equal to that of elastic hard spheres, except in the limitof large length-scales, as it occurs in the presence of an effectiveinteraction. On the other hand, the velocity field shows a more complexstructure which is a genuine expression of a non-equilibrium steady state andwhich can be compared to a recent fluctuating hydrodynamic theory withnon-equilibrium noise. The temporal decay of velocity modes autocorrelations iscompatible with linear hydrodynamic equations with rates dictated by viscousmomentum diffusion, corrected by a typical interaction time with thethermostat. Equal-time velocity structure factors display a peculiar shape witha plateau at large length-scales and another one at small scales, marking twodifferent temperatures: the "bath" temperature $T_b$, depending on shakingparameters, and the "granular" temperature $T_g<T_b$, which is affected bycollisions. The two ranges of scales are separated by a correlation lengthwhich grows with $\phi$, after proper rescaling with the mean free path.

Structure factors in granular experiments with homogeneous fluidization