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

U. M. Scheven
Phys. Rev. Lett. 120, 208006 – Published 18 May 2018

Abstract

The intrinsic longitudinal and transverse dispersivity of bidisperse random packings of spheres with size ratio 51 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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  • Received 21 December 2017

DOI:https://doi.org/10.1103/PhysRevLett.120.208006

© 2018 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Fluid Dynamics

Authors & Affiliations

U. M. Scheven*

  • Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA

  • *uscheven@umich.edu

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Issue

Vol. 120, Iss. 20 — 18 May 2018

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