Cornell University

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CFSeminar: Neeraj Sinai Borker (Cornell University), "Manipulating particle dynamics in a simple shear flow"

Tuesday, March 28, 2017 at 12:00pm

Frank H. T. Rhodes Hall, 178

Abstract:  Most particles tumble continuously in a Newtonian fluid subject to a simple shear flow at low Reynolds number because they respond more strongly to the vorticity than to the extensional component of the flow. However, rings with certain cross-sections can exhibit permanent alignment at finite particle aspect ratios without application of external forces. The ability to control dynamics of individual particles in a suspension allows precise control over the macroscopic properties of materials, which can be used to produce strongly anisotropic reinforced polymers from traditional processing flows such as injection molding.

I will explain the mechanism leading to alignment of rings using the flow field around the particle. I
will also show ways of manipulating cross-stream migration velocity of particles by controlling the shape of the cross-section. The linear and angular velocity of the ring is obtained from boundary-element method calculations. I will give try to give insight into particle geometries that will align at the least value of aspect ratio, defined as the ratio of the extent of the particle in the plane of the ring and the extent of the particle along the axis of symmetry. Reduction in aspect ratio not only simplifies particle fabrication, but also increases the integrity of the structure.

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