The transport of suspensions in geological, industrial and biomedical applications


The transport of suspensions in geological, industrial and biomedical applications

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dc.contributor.advisor Bonnecaze, R. T. (Roger T.)
dc.creator Oguntade, Babatunde Olufemi 2012-10-05T18:04:18Z 2012-10-05T18:04:18Z 2008-12 2012-10-05
dc.description.abstract Suspension flows in varied settings and at different concentrations of particles are studied theoretically using various modeling techniques. Particulate suspension flows are dispersion of particles in a continuous medium and their properties are a consequence of the interplay among hydrodynamic, buoyancy, interparticle and Brownian forces. The applicability of continuum modeling techniques to suspension flows at different particle concentration was assessed by studying systems at different time and length scales. The first two studies involve the use of modeling techniques that are valid in systems where the forces between particles are negligible, which is the case in dilute suspension flows. In the first study, the growth and progradation of deltaic geologic bodies from the sedimentation of particles from dilute turbidity currents is modeled using the shallow water equations or vertically averaged equations of motions coupled with a particle conservation equation. The shallow water model provides a basis for extracting grain size and depositional history information from seismic data. Next, the Navier-Stokes equations of motion and the convection-diffusion equation are used to model suspension flow in a biomedical application involving the flow and reaction of drug laden nanovectors in arteries. Results from this study are then used prescribe the best design parameters for optimal nanovector uptake at the desired sites within an artery. The third study involves the use of macroscopic two phase models to describe concentrated suspension flows where interparticle hydrodynamic forces cannot be neglected. The isotropic form of both the diffusion-flux and the suspension balance models are solved for a buoyant bidisperse pressure-driven flow system. The model predictions are found to compare fairly well with experimental results obtained previously in our laboratory. Finally, the power of discrete type models in connecting macroscopic observations to structural details is demonstrated by studying a system of aggregating colloidal particles via Brownian dynamics. The results from the simulations match experimental shear rheology and also provide a structural explanation for the observed macroscopic behavior of aging.
dc.format.medium electronic
dc.language.iso eng
dc.rights Copyright © is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.
dc.subject.lcsh Suspended sediments--Fluid dynamics--Mathematical models
dc.subject.lcsh Sediment transport--Mathematical models
dc.subject.lcsh Hemodynamics--Mathematical models
dc.subject.lcsh Aggregation (Chemistry)--Mathematical models
dc.subject.lcsh Colloids--Fluid dynamics--Mathematical models
dc.subject.lcsh Brownian movements--Mathematical models
dc.subject.lcsh Fluid dynamics--Mathematical models
dc.title The transport of suspensions in geological, industrial and biomedical applications
dc.description.department Chemical Engineering
dc.type.genre Thesis
dc.type.material text Chemical Engineering Chemical Engineering The University of Texas at Austin Doctoral Doctor of Philosophy

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