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Dispersivity of Bidisperse Packings of Spheres and Evidence for Distinct Random Structures.

Authors
  • Scheven, U M1
  • 1 Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA.
Type
Published Article
Journal
Physical Review Letters
Publisher
American Physical Society
Publication Date
May 18, 2018
Volume
120
Issue
20
Pages
208006–208006
Identifiers
DOI: 10.1103/PhysRevLett.120.208006
PMID: 29864349
Source
Medline
License
Unknown

Abstract

The intrinsic longitudinal and transverse dispersivity of bidisperse random packings of spheres with size ratio 5∶1 was determined by pulsed field gradient nuclear magnetic resonance, in the dilute regime where small spheres occupy between 0% and 5% of the packings' volume. Small spheres plugging pores systematically raise the mechanical transverse and longitudinal dispersivity above that of reference packings of monodisperse spheres. NMR-derived porosities, widths of velocity distributions, and dispersivities reveal distinct states of structural disorder above and below a relative sphere concentration n/N=1, where n and N are the number densities of small and large spheres.

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