Dilatancy in the flow and fracture of stretched colloidal suspensions
arXiv:1101.2309 · doi:10.1038/ncomms1119
Abstract
Concentrated particulate suspensions, commonplace in the pharmaceutical, cosmetic and food industries, display intriguing rheology. In particular, the dramatic increase in viscosity with strain rate (shear thickening and jamming) which is often observed at high volume fractions, is of strong practical and fundamental importance. Yet manufacture of these products and their subsequent dispensing often involves flow geometries substantially different from that of simple shear flow experiments. Here we show that the elongation and breakage of a filament of a colloidal fluid under tensile loading is closely related to the jamming transition seen in its shear rheology. However, the modified flow geometry reveals important additional effects. Using a model system with nearly hard-core interactions, we provide evidence of surprisingly strong viscoelasticity in such a colloidal fluid under tension. With high speed photography we also directly observe dilatancy and granulation effects, which lead to fracture above a critical elongation rate.
arXiv comment22pages, 4 figures
References in corpus (4)
- Shear thickening of cornstarch suspensions as a re-entrant jamming transition
- Jamming, two-fluid behaviour and 'self-filtration' in concentrated particulate suspensions
- Velocity oscillations in confined channel flows of concentrated colloidal suspensions
- Dilatancy, Jamming, and the Physics of Granulation
Cited by in corpus (26)
- Shear thickening in concentrated suspensions: phenomenology, mechanisms, and relations to jamming
- A unified description of the rheology of hard-particle suspensions
- A rheological state diagram for rough colloids in shear flow
- Interparticle hydrogen bonding can elicit shear jamming in dense suspensions
- High-speed ultrasound imaging in dense suspensions reveals impact-activated solidification due to dynamic shear jamming
- S-Shaped Flow Curves of Shear Thickening Suspensions: Direct Observation of Frictional Rheology
- Rheology of dense granular suspensions under extensional flow
- Constitutive relations for shear fronts in shear-thickening suspensions
- Self-similarity in the breakup of very dilute viscoelastic solutions
- Dynamic shear jamming in dense granular suspensions under extension
- System-spanning dynamically jammed region in response to impact of cornstarch and water suspensions
- Criteria for extensional necking instability in complex fluids and soft solids. Part I: imposed Hencky strain rate protocol
- Capillary Thinning of Elastic and Viscoelastic Threads: from Elastocapillarity to Phase Separation
- Stress controlled rheology of dense suspensions using transient flows
- Dilatancy in dense suspensions of model hard-sphere-like colloids under shear and extensional flow
- Intermittent dilation and its coupling to stress in discontinuous shear thickening suspensions
- Age dependent modes of extensional necking instability in soft glassy materials
- Role of normal stress in the creep dynamics and failure of a biopolymer gel
- Criteria for extensional necking instability in complex fluids and soft solids. Part II imposed tensile stress and force protocols
- Signature of jamming under steady shear in dense particulate suspensions
- Necking after extensional filament stretching of complex fluids and soft solids
- Bouncing of a projectile impacting a dense potato-starch suspension layer
- Characterizing the surface texture of a dense suspension undergoing dynamic jamming
- Tuning Interparticle Hydrogen Bonding in Shear-Jamming Suspensions: Kinetic Effects and Consequences for Tribology and Rheology
- Collision of Dynamic Jamming Fronts in a Dense Suspension
- Dynamic jamming of dense suspensions under tilted impact