AI Article Synopsis
- The study examines collective excitations in hard-sphere fluids through molecular dynamics simulations across various wave numbers and packing fractions.
- Non-hydrodynamic transverse excitations were observed at packing fractions of 0.395 or higher, as indicated by transverse current spectral functions.
- The results challenge the existing "Frenkel line" theory by showing that the sound dispersion in liquids does not solely depend on transverse excitations, with noted discrepancies in longitudinal excitations as well.
Article Abstract
Collective excitations in hard-sphere fluids were studied in a wide range of wave numbers and packing fractions η by means of molecular dynamics simulations. We report the observation of non-hydrodynamic transverse excitations for packing fractions η≥0.395 in the shape of transverse current spectral functions. Dispersion of longitudinal excitations in the whole range of packing fractions shows a negative deviation from the linear hydrodynamic law with increasing wave numbers even for dense hard-sphere fluids where the transverse excitations were observed. These results do not support a recent proposal within the "Frenkel line" approach that the positive sound dispersion in liquids is defined by transverse excitations. We report calculations of the cutoff "Frenkel frequencies" for transverse excitations in hard-sphere fluids and discuss their consistency with the estimated dispersions of shear waves.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1063/1.4997640 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!