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Flow of supercooled liquids under dipolar force field
1Graduate School of Arts and Sciences, University of Tokyo, Meguro-ku, Tokyo 153-8902, Japan.
The Journal of Chemical Physics
|July 15, 2025
Summary
Supercooled liquids exhibit dynamic heterogeneity, causing them to flow faster than predicted by Navier-Stokes equations near an applied force. This deviation intensifies with increased supercooling and dynamic heterogeneity growth.
Area of Science:
- Condensed Matter Physics
- Fluid Dynamics
- Computational Materials Science
Background:
- Supercooled liquids increase in viscosity as temperature drops, leading to a glass transition.
- Dynamic heterogeneity, marked by spatial correlations in motion, accompanies this transition.
Purpose of the Study:
- To investigate the influence of dynamic heterogeneity on the applicability of Navier-Stokes equations for supercooled liquids.
- To determine if Navier-Stokes equations accurately describe fluid flow in supercooled liquids under external forces.
Main Methods:
- Employed molecular dynamics simulations for a two-dimensional supercooled liquid.
- Applied a localized dipolar force field to the liquid.
- Compared the simulated steady velocity field against Navier-Stokes predictions.
Main Results:
- Observed a significant breakdown of the Navier-Stokes equations in real space.
- Supercooled liquids flowed more rapidly near the applied force than Navier-Stokes predicted.
- This deviation amplified with increased supercooling and correlated with growing dynamic heterogeneity.
Conclusions:
- Navier-Stokes equations are insufficient to describe the flow of supercooled liquids, especially under external forces.
- Dynamic heterogeneity plays a crucial role in the deviation from Navier-Stokes predictions.
- Further research is needed to understand the complex flow dynamics of supercooled liquids.
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