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- Title
- Nonlocal viscosity kernel of mixtures
- Author(s)
- Smith, Ben; Hansen, J. S.; Todd, B. D.
- Abstract
- In this Brief Report we investigate the multiscale hydrodynamical response of a liquid as a function of mixture composition. This is done via a series of molecular dynamics simulations in which the wave-vector-dependent viscosity kernel is computed for three mixtures, each with 7-15 different compositions. We observe that the viscosity kernel is dependent on composition for simple atomic mixtures for all the wave vectors studied here; however, for a molecular mixture the kernel is independent of composition for large wave vectors. The deviation from ideal mixing is also studied. Here it is shown that the Lorentz-Berthelot interaction rule follows ideal mixing surprisingly well for a large range of wave vectors, whereas for both the Kob-Andersen and molecular mixtures large deviations are found. Furthermore, for the molecular system the deviation is wave-vector dependent such that there exists a characteristic correlation length scale at which the ideal mixing goes from underestimating to overestimating the viscosity.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Faculty of Engineering and Industrial Sciences
- Source
- Physical Review E, Vol. 85, no. 2 (Feb 2012), article no. 022201
- Publication year
- 2012
- FOR Code(s)
- 01 Mathematical Sciences; 02 Physical Sciences; 09 Engineering
- Keyword(s)
- Ideal mixing; Liquids; Molecular dynamics; Viscosity kernels
- Publisher
- American Physical Society
- ISSN
- 1539-3755
- Publisher URL
- http://dx.doi.org/10.1103/PhysRevE.85.022201
- Copyright
- Copyright © 2012 American Physical Society. The published version is reproduced with the kind permission of the publisher.
- Additional information
- The authors acknowledge support from the Lundbeckfonden (Grant No. R49-A5634).
- Full text
- Peer reviewed
