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- Viscosity kernel of molecular fluids: butane and polymer melts
- Puscasu, R. M.; Todd, B. D.; Daivis, P. J.; Hansen, J. S.
- The wave-vector dependent shear viscosities for butane and freely jointed chains have been determined. The transverse momentum density and stress autocorrelation functions have been determined by equilibrium molecular dynamics in both atomic and molecular hydrodynamic formalisms. The density, temperature, and chain length dependencies of the reciprocal and real-space viscosity kernels are presented. We find that the density has a major effect on the shape of the kernel. The temperature range and chain lengths considered here have by contrast less impact on the overall normalized shape. Functional forms that fit the wave-vector-dependent kernel data over a large density and wave-vector range have also been tested. Finally, a structural normalization of the kernels in physical space is considered. Overall, the real-space viscosity kernel has a width of roughly 3-6 atomic diameters, which means that generalized hydrodynamics must be applied in predicting the flow properties of molecular fluids on length scales where the strain rate varies sufficiently in the order of these dimensions (e.g., nanofluidic flows).
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Molecular Simulation
- Physical Review E, Vol. 82, no. 1 (Jul 2010), article no. 011801
- Publication year
- American Physical Society
- Publisher URL
- Copyright © 2010 The American Physical Society. Published version of the paper reproduced here with the kind permission of the publisher for non-commercial purposes only.