Regensburg 2022 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 44: Poster Session: Statistical Physics and Critical Phenomena
DY 44.5: Poster
Donnerstag, 8. September 2022, 15:00–18:00, P2
Shear flow induced instability of a trapped colloidal particle in a complex medium — •Lea Fernandez and Sabine H.L. Klapp — Institute for Theoretical Physics, TU Berlin
The motion of a colloidal particle in a complex medium, bound by an optical trap and subjected to a shear flow can be modelled by the Lanvegin equations for an over-damped harmonic oscillator in n dimensions. Here we treat nobs observed, physical variables, with n= nobs+nint, and nint internal, auxiliary variables modelling a complex medium. Analytical and numerical results are presented for nobs=2 and nint=1, where the coupling between the observed variables is given by a plane Couette flow. We analyse the dynamics of averages, probability densities, and trajectories using Brownian dynamics and the Smoluchowski equation. Of special interest is the effect of the coupling with the auxiliary variable. The focus is on coupling parameters where the steady shear flow causes a transition from a stationary state to an in-stationary state, corresponding to a delocalisation of the particle, when the shear rate exceeded a critical value.