Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 36: Complex Fluids and Colloids V (joint session BP/CPP/DY, organized by DY)
CPP 36.4: Vortrag
Mittwoch, 9. März 2016, 10:45–11:00, H47
Rheology of weakly attractive systems: the role of energy dissipation — •Ehsan Irani1, Pinaki Chaudhuri2, and Claus Heussinger1 — 1Institute for Theoretical Physics, Georg-August University of Göttingen, Göttingen, Germany — 2Institute of Mathematical Sciences, Tamil Nadu, India
The rheological response of a particulate system with attractive interactions is studied using different models for the dissipation of energy. In systems with the damping force directed normally to the contact point, attractive interactions result in a finite yield stress, and an iso-static structure emerges below the jamming point with shear bands forming as a consequence of non-monotonic flow curves. On the other hand, tangential damping gives rise to the monotonic flow curves and a viscous flow develops in the overdamped regime. However in that case, decreasing the damping factor introduces the inertial time-scale, leading again to non-monotonic flow curves and inertia-induced shear-banding is observed in the underdamped regime. In both cases, the rheology of the system is expressed in terms of relevant damping time-scales and the ratio of dissipative to elastic forces.