Abstract
The intrinsic longitudinal and transverse dispersivity of bidisperse random packings of spheres with size ratio 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 , where and are the number densities of small and large spheres.
- Received 21 December 2017
DOI:https://doi.org/10.1103/PhysRevLett.120.208006
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