Deformation Dynamics of Wet Foams and Bubbles in Wide Microfluidic Channels

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dc.contributor.advisorBiswal, Sibani Lisa
dc.creatorVecchiolla, Daniel J
dc.date.accessioned2019-08-12T14:20:42Z
dc.date.available2019-08-12T14:20:42Z
dc.date.created2019-08
dc.date.issued2019-08-09
dc.date.submittedAugust 2019
dc.date.updated2019-08-12T14:20:42Z
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.
dc.format.mimetypeapplication/pdf
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>.
dc.identifier.urihttps://hdl.handle.net/1911/106196
dc.language.isoeng
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.
dc.subjectfoam rheology
dc.subjectmicrofluidics
dc.subjectdislocations
dc.subjectplastic deformation
dc.subjectT1 topological rearrangement
dc.subjectbubble splitting
dc.subjectpinch-off
dc.subjectgeometrically mediated splitting
dc.subjectsurface energy wells
dc.titleDeformation Dynamics of Wet Foams and Bubbles in Wide Microfluidic Channels
dc.typeThesis
dc.type.materialText
thesis.degree.departmentChemical and Biomolecular Engineering
thesis.degree.disciplineEngineering
thesis.degree.grantorRice University
thesis.degree.levelDoctoral
thesis.degree.majorChemical Engineering
thesis.degree.nameDoctor of Philosophy
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