Computer simulation of rheological phenomena in dense colloidal suspensions with dissipative particle dynamics
- 18 November 1996
- journal article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 8 (47), 9509-9512
- https://doi.org/10.1088/0953-8984/8/47/053
Abstract
The rheological properties of colloidal suspensions of spheres and rods have been studied using dissipative particle dynamics (DPD). We have measured the viscosity as a function of shear rate and volume fraction of the suspended particles. The viscosity of a 30 vol% suspension of spheres displays characteristic shear-thinning behaviour as a function of shear rate. The values for the low- and high-shear viscosity are in good agreement with experimental data. For higher particulate densities, good results are obtained for the high-shear viscosity, although the viscosity at low shear rates shows a dependence on the size of the suspended spheres. Dilute suspensions of rods show an intrinsic viscosity which is in excellent agreement with theoretical results. For concentrated rod suspensions, the viscosity increases with the third power of the volume fraction. We find the same scaling behaviour as Doi and Edwards for the semidilute regime, although the explanation is unclear. The DPD simulation technique therefore emerges as a useful tool for studying the rheology of particulate suspensions.Keywords
This publication has 7 references indexed in Scilit:
- Computer simulation of dilute polymer solutions with the dissipative particle dynamics methodJournal of Rheology, 1995
- Phase Separation in Bimodal Dispersions of Sterically Stabilized Silica ParticlesEurophysics Letters, 1993
- Simulating Microscopic Hydrodynamic Phenomena with Dissipative Particle DynamicsEurophysics Letters, 1992
- Hard‐sphere Colloidal Dispersions: The Scaling of Rheological Properties with Particle Size, Volume Fraction, and Shear RateJournal of Rheology, 1989
- The rheology of dilute suspensions of slender rods in weak flowsJournal of Fluid Mechanics, 1987
- The computer study of transport processes under extreme conditionsJournal of Physics C: Solid State Physics, 1972
- Die Abhängigkeit der Viskosität vom Strömungsgefälle bei hochverdünnten Suspensionen und LösungenHelvetica Chimica Acta, 1945