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The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title: Mixing enhancement by dual speed rotating stirrer
Author: Goullet, Arnaud
View Online: njit-etd2004-085
(xii, 117 pages ~ 11.5 MB pdf)
Department: Department of Mathematical Sciences
Degree: Doctor of Philosophy
Program: Mathematical Sciences
Document Type: Dissertation
Advisory Committee: Aubry, N. (Committee chair)
Blackmore, Denis L. (Committee member)
Kondic, Lou (Committee member)
Papageorgiou, Demetrius T. (Committee member)
Siegel, Michael (Committee member)
Date: 2004-05
Keywords: Mixing
Dual speed
Availability: Unrestricted

Stirring is a well-known means of fluid mixing due to the emergence of complex patterns in the flow, even at low Reynolds numbers. In this work, we consider a stirrer rotating along a circular trajectory at constant speed. The fluid flow, considered incompressible, inviscid and two dimensional (in a circular container), is modeled by a point vortex model consisting of a vortex rotating in a circular container at constant angular speed. The mixing problem is addressed by considering the Hamiltonian form of the advection equations formulated in a frame of reference moving with the vortex. The dynamics of passive fluid particles is considered using dynamical systems theory. The bifurcation diagram reveals the presence of degenerate fixed points and homoclinic/heteroclinic orbits, whose nature varies for different parameter values. By considering an initially concentrated set of marker particles and using the various structures of the phase space in the bifurcation diagram, we produce a complex dynamics which, in turn, can generate efficient mixing. The latter is studied using both numerical simulations and physical experiments. A perturbation study for one particular structure for the phase space shows the presence of a transverse homoclinic orbit as well as resonances, or a set of closed trajectories.

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