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 36.5: Vortrag
Mittwoch, 9. März 2016, 11:00–11:15, H47
Transport properties of correlated fluids in confinement — •Christian Rohwer1,2 and Matthias Krueger1,2 — 1Max Planck Institute for Intelligent Systems, 70569 Stuttgart, Germany — 24th Institute for Theoretical Physics, University of Stuttgart, 70569 Stuttgart, Germany
Correlations in confined fluids give rise to a wealth of remarkable phenomena. Several equilibrium phenomena, e.g. the critical (thermal) Casimir forces, have been described theoretically and observed experimentally. However, although certain non-equilibrium aspects of such systems can be probed experimentally or through computer simulations, a clear theoretical understanding for confined, correlated fluids out of equilibrium is still lacking.
In this work we consider a dynamical theoretical model for confined fluids with correlations (e.g. oil-water mixtures near / at the critical point), thereby extending known results for bulk systems. In particular, we investigate the steady state velocity profiles in a sheared near-critical fluid film, in dependence on various parameters (e.g. separation of the plates, bulk correlation length, external fields...). Our approach is based on linear response theory for small shearing velocities, and leads to a self-consistent formulation for the shear rate in the film.
We also address the dependence on the choice of dynamical model, since conservation laws strongly affect dynamical time-scales. Lastly we discuss potential experimental realisations of our model.