Regensburg 2016 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 28: Poster - Complex Fluids, Granular Matter, Glasses

DY 28.4: Poster

Dienstag, 8. März 2016, 18:15–21:00, Poster C

Studying the The dynamics of polymeric liquids under time-delayed feedback — •Peter Kalle and Holger Stark — Institut für Theoretische Physik, Technische Universität Berlin, 10623 Berlin, Germany

Soft materials or complex fluids strongly respond to external fields and thereby show prominent non-equilibrium structure formation. Applying control strategies to shape and engineer the flow of liquids on the micron scale virtually is an unexplored field.

We study the dynamics of the Oldroyd B model, a nonlinear model to treat the dynamics of polymeric liquids, under the influence of time-delayed feedback schemes in the limit of low Reynolds numbers.

Experiments with polymeric liquids in channel flows at low Reynolds numbers have recently demonstrated that a nonlinear bifurcation towards a fluctuating flow field occurs [1]. Hence, we study the impact of time-delayed feedback schemes on a channel flow. Furthermore, as the curvature of a geometry is linked to linear elastic instabilities [2], we present first results for controlling Taylor-Couette flow as in [3] and also address the circular geometry of [4] without inner cylinder.

[1] L. Pan, A. Morozov, C. Wagner, P.E. Arratia, Phys. Rev. Lett. 110, 174502 (2013).

[2] G. H. McKinley, P. Pakdel and A. Öztekin, J. Non-Newt. Fluid Mech. 67, 19 (1996).

[3] R. G. Larson, S. G. Shaqfeh and S. J. Muller, J. Fluid Mech. 218, 573-600 (1990).

[4] M. Zeitz, P. Gurevich and H. Stark, Eur. Phys. J. E 38, 22 (2015).