SKM 2023 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 3: Active Matter I (joint session BP/CPP/DY)

DY 3.9: Vortrag

Montag, 27. März 2023, 12:00–12:15, TOE 317

Pumping, Mixing, and Signal Transmission in Active Pores — •Goncalo Antunes1,2,3, Paolo Malgaretti1,2,3, Siegfried Dietrich2,3, and Jens Harting1,41Helmholtz-Institut Erlangen-Nürnberg für Erneuerbare Energien (IEK--11), Forschungszentrum Jülich, Cauer Str. 1, 91058 Erlangen, Germany — 2Max--Planck--Institut für Intelligente Systeme, Heisenbergstr. 3, 70569 Stuttgart, ,Germany — 3IV. Institut für Theoretische Physik, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany — 4Department Chemie- und Bioingenieurwesen und Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Fürther Straße 248, 90429 Nürnberg, Germany

Much attention is currently being given to the problem of manipulating fluids at the microscale, with successful applications to fields such as 3D fabrication and biomedical research. An intriguing technique to manipulate fluid flows in a pore is diffusioosmosis. We show both numerically and analytically that a corrugated catalytic pore can act as a micropump even when it is fore-aft symmetric. This phenomenology is possible due to a spontaneous symmetry breaking which occurs when advection rather than diffusion is the dominant mechanism of solute transport. Relaxing the condition of Stokes flow leads to unsteady flow, and persistent oscillations with a tunable frequency appear. We further include the inverse chemical reaction that consumes solute and introduces an additional timescale. Finally, we find that the flow may lose its axial symmetry and hence promote mixing in the low Reynolds number regime.

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