Negative pressure in shear thickening band of a dilatant fluid

Abstract

We perform experiments and numerical simulations to investigate spatial distribution of pressure in a sheared dilatant fluid of the Taylor-Couette flow under a constant external shear stress. In a certain range of shear stress, the flow undergoes the shear thickening oscillation around 20 Hz. We find that, during the oscillation, a localized thickened band rotates around the axis with the flow. {Based upon experiments and numerical simulations, we show that a major part of the thickened band is under negative pressure even in the case of discontinuous shear thickening}, which indicates that the thickening is caused by Reynolds dilatancy; the dilatancy causes the negative pressure in interstitial fluid, which generates contact structure in the granular medium., then frictional resistance hinders rearrangement of the structure and solidifies the medium.

7 pages and 5 figures. to appear in Phys. Rev. E

References in corpus (5)

• Hydrodynamic and contact contributions to shear thickening in colloidal suspensions
• Shear thickening of cornstarch suspensions as a re-entrant jamming transition
• A rheological signature of frictional interactions in shear thickening suspensions
• Velocity oscillations in confined channel flows of concentrated colloidal suspensions
• Dilatancy, Jamming, and the Physics of Granulation

Cited by in corpus (5)

• The physics of dense suspensions
• Uncovering instabilities in the spatiotemporal dynamics of a shear-thickening cornstarch suspension
• Structure of propagating high stress fronts in a shear thickening suspension
• Bouncing of a projectile impacting a dense potato-starch suspension layer
• Shear thickening of suspensions of dimeric particles