Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2007-09-11
J. Chem. Phys. 127, 244906 (2007)
Physics
Condensed Matter
Soft Condensed Matter
7 pages, 5 figures, 2 tables, submitted
Scientific paper
10.1063/1.2806094
We present a dynamic density functional theory (dDFT) which takes into accou nt the advection of the particles by a flowing solvent. For potential flows we can use the same closure as in the absence of solvent flow. The structure of the resulting advected dDFT suggests that it could be used for non-potential flows as well. We apply this dDFT to Brownian particles (e.g., polymer coils) in a solvent flowing around a spherical obstacle (e.g., a colloid) and compare the results with direct simulations of the underlying Brownian dynamics. Although numerical limitations do not allow for an accurate quantitative check of the advected dDFT both show the same qualitative features. In contrast to previous works which neglected the deformation of the flow by the obstacle, we find that the bow-wave in the density distribution of particles in front of the obstacle as well as the wake behind it are reduced dramatically. As a consequence the friction force exerted by the (polymer) particles on the colloid can be reduced drastically.
Dominguez Alvaro
Krueger Matthias
Penna Florencia
Rauscher Markus
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