Deformation Dynamics of Wet Foams and Bubbles in Wide Microfluidic Channels

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dc.contributor.advisorBiswal, Sibani Lisaen_US
dc.creatorVecchiolla, Daniel Jen_US
dc.date.accessioned2019-08-12T14:20:42Zen_US
dc.date.available2019-08-12T14:20:42Zen_US
dc.date.created2019-08en_US
dc.date.issued2019-08-09en_US
dc.date.submittedAugust 2019en_US
dc.date.updated2019-08-12T14:20:42Zen_US
dc.description.abstractA prominent feature of microfluidics is the ability to generate monodisperse bubbles (or droplets) of tunable volumes and densities, which rapidly self-order under the confinement of the channels. The geometric and hydrodynamic controllability of these systems enables the precise handling and manipulation of the fluids to foster the plastic deformation of crystalline foam and bubble-bubble pinch-off using wide (>1000 μm) channels. Densely packed wet foam was subjected to expansion-contraction flow to study localized plastic deformation events from extensional and compressive stresses within the monodisperse bubble matrix. Dislocations cyclically reflected in tension or compression with disparate mechanisms in two independent rearrangement zones. The relationship between structures resembling the Inverse-Stone-Wales (ISW) defect and the partially dissociated ISW defect of graphene was examined in the model foam. An extended expansion region to force the flowing crystal out of long-range order to investigate 2-D phase transitions (i.e. melting and recrystallization) could be a promising area of future research. Symmetric and asymmetric expansions were utilized for promoting systematic bubble-bubble pinch-off to produce segregated, mono- and bidisperse bubbles at capacities exceeding 10,000 bubbles per second. The pinch-off dynamics demonstrate that bubbles split from the confinement of a “pincher” bubble and “wall” bubble, in connection with pore-level breakup mechanisms previously discovered by our lab. The wall bubble was shown to modulate the fluidic resistance in an asymmetric expansion, allowing the fragmented bubble size ratio to be adjusted by tuning the size of the bubbles formed upstream. Consequently, the system acts as a generator of ordered bi- or tridisperse foam that can be employed to study dynamic bubble interactions (e.g. coarsening) and ordered, multidisperse foam deformation. Cross-shaped surface energy wells with comparable in-plane dimensions to the initially trapped bubbles were employed to study the interactions between a large trapped bubble and the smaller monodisperse bubbles of the surrounding foam including diffusive gas exchange, bubble-bubble breakup and large bubble migration.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationVecchiolla, Daniel J. "Deformation Dynamics of Wet Foams and Bubbles in Wide Microfluidic Channels." (2019) Diss., Rice University. <a href="https://hdl.handle.net/1911/106196">https://hdl.handle.net/1911/106196</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/106196en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectfoam rheologyen_US
dc.subjectmicrofluidicsen_US
dc.subjectdislocationsen_US
dc.subjectplastic deformationen_US
dc.subjectT1 topological rearrangementen_US
dc.subjectbubble splittingen_US
dc.subjectpinch-offen_US
dc.subjectgeometrically mediated splittingen_US
dc.subjectsurface energy wellsen_US
dc.titleDeformation Dynamics of Wet Foams and Bubbles in Wide Microfluidic Channelsen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentChemical and Biomolecular Engineeringen_US
thesis.degree.disciplineEngineeringen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.majorChemical Engineeringen_US
thesis.degree.nameDoctor of Philosophyen_US
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