269 citations · 1k across the 9 of their papers we have counts for
9 papers
Rheopexy and tunable yield stress of carbon black suspensions
Guillaume Ovarlez, Laurent Tocquer, François Bertrand +1
We show that besides simple or thixotropic yield stress fluids there exists a third class of yield stress fluids. This is illustrated through the rheological behavior of a carbon b…
On the existence of a simple yield stress fluid behavior
Guillaume Ovarlez, Sylvie Cohen-Addad, Kapil Krishan +2
Materials such as foams, concentrated emulsions, dense suspensions or colloidal gels, are yield stress fluids. Their steady flow behavior, characterized by standard rheometric tech…
Shear-induced sedimentation in yield stress fluids
Guillaume Ovarlez, François Bertrand, Philippe Coussot +1
Stability of coarse particles against gravity is an important issue in dense suspensions (fresh concrete, foodstuff, etc.). On the one hand, it is known that they are stable at res…
Physical origin of shear-banding in jammed systems
Philippe Coussot, Guillaume Ovarlez
Jammed systems all have a yield stress. Among these materials some have been shown to shear-band but it is as yet unclear why some materials develop shear-band and some others do n…
Transition from a simple yield stress fluid to a thixotropic material
Alexandre Ragouilliaux, Guillaume Ovarlez, Noushine Shahidzadeh-Bonn +3
From MRI rheometry we show that a pure emulsion can be turned from a simple yield stress fluid to a thixotropic material by adding a small fraction of colloidal particles. The two…
Phenomenology and physical origin of shear-localization and shear-banding in complex fluids
Guillaume Ovarlez, Stéphane Rodts, Xavier Chateau +1
We review and compare the phenomenological aspects and physical origin of shear-localization and shear-banding in various material types, namely emulsions, suspensions, colloids, g…