The generalized hydrodynamic theory - transient elasticity and other examples

Wednesday, October 7, 2009 - 11:15am - 12:15pm
Keller 3-180
Harald Pleiner (Max Planck Institute for Polymer Research)
For modeling complex fluids (and more generally soft matter) on the phenomenological level a generalization of the well-known hydrodynamic method is proposed. It preserves the basic thermodynamic rules and linear response structure of ordinary hydrodynamics, but allows the handling of additional mesoscopic degrees of freedom that make those materials 'complex'. This is exemplified by discussing transient elasticity and applying it explicitly to the non-Newtonian behavior of polymers (and colloidal systems). Transient elasticity seems to be the defining physics for those systems and also for yield stress soft matter. As a second example true 2-fluid systems and the problems of their generalized hydrodynamics are briefly described.