Fluid depletion in shear bands
Roman Mani, Dirk Kadau, Dani Or, Hans J. Herrmann
TL;DR
This paper investigates the counterintuitive depletion of pore liquid in shear bands of wet granular media, revealing microscale mechanisms and developing a modified diffusion model for liquid transport during shear-induced rupture.
Contribution
It introduces a microscale model explaining liquid depletion in shear bands and derives a modified diffusion equation for rupture-induced liquid migration.
Findings
Liquid is depleted in shear bands despite dilatancy.
Measured profiles match numerical simulations.
A new diffusion model describes rupture-induced liquid transport.
Abstract
How does pore liquid reconfigure within shear bands in wet granular media? Conventional wisdom predicts that liquid is drawn into dilating granular media. We, however, find a depletion of liquid in shear bands despite increased porosity due to dilatancy. This apparent paradox is resolved by a microscale model for liquid transport at low liquid contents induced by rupture and reconfiguration of individual liquid bridges. Measured liquid content profiles show macroscopic depletion bands similar to results of numerical simulations. We derive a modified diffusion description for rupture-induced liquid migration.
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