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MM: Fachverband Metall- und Materialphysik
MM 16: Topical Session: Thermophysical Properties of Bulk Metallic Glasses and Bulk Metallic Glass-forming Liquids
MM 16.3: Vortrag
Mittwoch, 19. März 2025, 11:00–11:15, H10
Non-monotonic hydrodynamic relaxations in a nanochannel — •Linnea Heitmeier1,2, Thomas Voigtmann1,2, and Jesper Schmidt Hansen3 — 1Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Köln, 51170 — 2Heinrich Heine University, Universitätsstraße 1, Düsseldorf — 3DNRF Center Glass and Time, IMFUFA, Department of Science, Systems and Models, Roskilde University, DK-4000 Roskilde
Nanotechnology is an active research field with applications in the everyday-life, electronics and medicine.
In my talk, I will present results of Molecular-Dynamics Simulations of a glass-forming liquid, which is confined in a nanochannel and excited with a sinusoidal force in order to probe the velocity relaxation on different lengthscales.
I show that the velocity relaxation behavior in different regions of the channel depends non-monotonically on the position of the fluid.
To explain the results, I will make use of the Maxwell-model for fluids, which states that a fluid behaves like an elastic solid on small timescales and like a viscous fluid on large timescales.
The simulation results can be recovered by this model, when using generalizations of this model:
On the one hand, a two-mode-Maxwell-model captures the contributions from the short-time dynamics and the slow structural relaxation to the viscosity. On the other hand, a spatially non-local generalization of the Maxwell-model allows to capture the velocity relaxation in the channel depending on different positions.
Keywords: Nanofluidics; Molecular-Dynamics Simulations; Maxwell-model; Viscoelastic Fluids; Non-locality