Dynamic regimes of fluids simulated by multiparticle-collision dynamics

Physics – Condensed Matter – Soft Condensed Matter

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

15 pages, 15 figures

Scientific paper

10.1103/PhysRevE.72.016701

We investigate the hydrodynamic properties of a fluid simulated with a mesoscopic solvent model. Two distinct regimes are identified, the `particle regime' in which the dynamics is gas-like, and the `collective regime' where the dynamics is fluid-like. This behavior can be characterized by the Schmidt number, which measures the ratio between viscous and diffusive transport. Analytical expressions for the tracer diffusion coefficient, which have been derived on the basis of a molecular-chaos assumption, are found to describe the simulation data very well in the particle regime, but important deviations are found in the collective regime. These deviations are due to hydrodynamic correlations. The model is then extended in order to investigate self-diffusion in colloidal dispersions. We study first the transport properties of heavy point-like particles in the mesoscopic solvent, as a function of their mass and number density. Second, we introduce excluded-volume interactions among the colloidal particles and determine the dependence of the diffusion coefficient on the colloidal volume fraction for different solvent mean-free paths. In the collective regime, the results are found to be in good agreement with previous theoretical predictions based on Stokes hydrodynamics and the Smoluchowski equation.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Dynamic regimes of fluids simulated by multiparticle-collision dynamics does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Dynamic regimes of fluids simulated by multiparticle-collision dynamics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamic regimes of fluids simulated by multiparticle-collision dynamics will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-103854

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.