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Title:Modeling Flow-Induced Microstructure of Inhomogeneous Liquid-Liquid Mixtures
Author(s):Wetzel, Eric Dean
Doctoral Committee Chair(s):Tucker, Charles L., III
Department / Program:Mechanical Engineering
Discipline:Mechanical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Physics, Fluid and Plasma
Abstract:Liquid-liquid dispersions are found commonly in nature and industry. As these dispersions flow, the microstructure changes due to deformation and breakup processes at the microscale. The ability to predict this microstructural evolution has many applications, including controlling properties in polymer blends, predicting earthquake aftershocks, and modeling the flow of biological fluids. In order to model these systems, an exact Stokes flow solution is found for the deformation of a Newtonian droplet suspended in a Newtonian fluid with a different viscosity, for the case of negligible interfacial tension. Using this theory, we are able to predict droplet stretching, reorientation, and tumbling, and can quantitatively replicate available experimental observations of droplet behavior. A rheological theory for dilute dispersions is also derived which explicitly includes the effects of microstructure on the dispersion rheology. Example calculations show that, even in simple flows, microstructural effects can cause complex rheological behaviors in dispersions. Finally, these models are applied to complex flows of dispersions using the finite element method. Microstructure is predicted as a field variable in temporally- and spatially-varying flows, providing important new insights into microstructural development in dispersions.
Issue Date:1999
Description:337 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1999.
Other Identifier(s):(MiAaPQ)AAI9945026
Date Available in IDEALS:2015-09-25
Date Deposited:1999

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