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oai:www.ideals.illinois.edu:2142/83987 2023-07-11 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

Tucker, Charles L., III Wetzel, Eric Dean 2015-09-25T21:13:02Z 2015-09-25T21:13:02Z 10000-01-01 1999 1999 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. Made available in DSpace on 2015-09-25T21:13:02Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 9945026.pdf: 15604362 bytes, checksum: 8cd67ecddcaf34d5ec25aab92f785977 (MD5) Previous issue date: 1999 Embargo set by: Seth Robbins for item 85268 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 337 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1999. http://hdl.handle.net/2142/83987 (MiAaPQ)AAI9945026 eng Physics, Fluid and Plasma Modeling Flow-Induced Microstructure of Inhomogeneous Liquid-Liquid Mixtures text Mechanical Engineering Mechanical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.