Nanoparticle Brownian Motion and Hydrodynamic Interactions in the Presence of Flow Fields

Overview

Journal Phys Fluids (1994)

Publisher American Institute of Physics

Date 2011 Sep 16

PMID 21918592

Citations 21

Authors

B Uma

T N Swaminathan

R Radhakrishnan

D M Eckmann

P S Ayyaswamy

Affiliations

Soon will be listed here.

Abstract

We consider the Brownian motion of a nanoparticle in an incompressible Newtonian fluid medium (quiescent or fully developed Poiseuille flow) with the fluctuating hydrodynamics approach. The formalism considers situations where both the Brownian motion and the hydrodynamic interactions are important. The flow results have been modified to account for compressibility effects. Different nanoparticle sizes and nearly neutrally buoyant particle densities are also considered. Tracked particles are initially located at various distances from the bounding wall to delineate wall effects. The results for thermal equilibrium are validated by comparing the predictions for the temperatures of the particle with those obtained from the equipartition theorem. The nature of the hydrodynamic interactions is verified by comparing the velocity autocorrelation functions and mean square displacements with analytical and experimental results where available. The equipartition theorem for a Brownian particle in Poiseuille flow is verified for a range of low Reynolds numbers. Numerical predictions of wall interactions with the particle in terms of particle diffusivities are consistent with results, where available.

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