Analysis of the Migration of Rigid Polymers and Nanorods in a Rotating Viscometric Flow
The dynamics and rheology of a rigid polymer or nanorod suspended in a Newtonian, viscous fluid under torsional flow have been studied. Our theoretical analysis predicts that rigid rods migrate in the radial direction according to their orientational configuration which is controlled by the competition between the shear flow, which tends to align the rods in the direction of flow, and Brownian motion, which tends to randomize the orientation. Steady and transient distributions of the center-of-mass in a dilute solution are derived from a kinetic theory and are confirmed by performing a Brownian dynamics simulation. The migration shifts the distribution toward the axis of rotation and enhances the shear-thinning behavior of the suspension.
J. Park and J. E. Butler, "Analysis of the Migration of Rigid Polymers and Nanorods in a Rotating Viscometric Flow," Macromolecules, vol. 43, no. 5, pp. 2535-2543, American Chemical Society (ACS), Mar 2010.
The definitive version is available at https://doi.org/10.1021/ma901369a
Chemical and Biochemical Engineering
Keywords and Phrases
Axis of Rotation; Brownian Dynamics Simulations; Brownian Motion; Center-of-Mass; Dilute Solution; Newtonians; Orientational Configuration; Radial Direction; Rigid Polymers; Rigid Rods; Shear-Thinning Behavior; Steady and Transient; Viscometric Flows; Viscous Fluids; Brownian Movement; Nanorods; Rotation
International Standard Serial Number (ISSN)
Article - Journal
© 2010 American Chemical Society (ACS), All rights reserved.
01 Mar 2010