NMR Experiments on a Three-Dimensional Vibrofluidized Granular Medium
Chao Huan, Xiaoyu Yang, D. Candela, R. W. Mair, R. L. Walsworth
Abstract
A three-dimensional granular system fluidized by vertical container vibrations was studied using pulsed field gradient (PFG) NMR coupled with one-dimensional magnetic resonance imaging (MRI). The system consisted of mustard seeds vibrated vertically at 50 Hz, and the number of layers Nell <= 4 was sufficiently low to achieve a nearly time-independent granular fluid. Using NMR, the vertical profiles of density and granular temperature were directly measured, along with the distributions of vertical and horizontal grain velocities. The velocity distributions showed modest deviations from Maxwell-Boltzmann statistics, except for the vertical velocity distribution near the sample bottom which was highly skewed and non-Gaussian. Data taken for three values of Nell and two dimensionless accelerations Gamma=15,18 were fit to a hydrodynamic theory, which successfully models the density and temperature profiles including a temperature inversion near the free upper surface.
Create a lesson
Related papers
PANDA-D: Interface-free determination of two dynamic contact angles
Georgii K. Vandyshev, Grigorii S. Gorkaev, Nikolay D. Kondratyuk et al.
Phase coexistence and nucleation of aging condensates
Yicheng Qiang, Chengjie Luo, David Zwicker
From Action Principle to Stochastic Thermodynamics of Elastic and Viscous Active Matter
Valentina Barletta, Michele Lupini, Ian D. Estabrook et al.
Drying-Induced Size Segregation and Stratification in Colloidal Droplets across Binary, Ternary, and Polydisperse Systems
Zhoaxuan Liu, Marjolein Dijkstra
Spatiotemporally correlated activity regulation of random-organizing hyperuniform states
Yuhan Peng, Yusheng Lei, Ran Ni
Distribution Functions and Moments of Harmonically Trapped Inertial Run-and-Tumble Particles in a Shear-Thickening Medium
Subhanker Howlader, Prasenjit Das