Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"Yield Stress Fluid"”.
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Extending yield-stress fluid paradigms
In this thesis, we present two new paradigms for yield-stress fluids; the first organizes the existing understanding of the various ways to achieve a yield-stress fluid into a useful methodology for the design of rheologically complex materials; the second is based on the discrepancy in the …
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When sticky fluids do and do not stick: yield-stress fluid drop impacts
… we use high-speed video to experimentally study yield-stress fluids impacting three types of surfaces that exhibit distinct and fascinating behaviors: coated surfaces, permeable surfaces, and hot surfaces. A variety of common materials such as peanut butter, toothpaste, paints, foams, printing …
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A motion of freely oscillating droplet of a yield stress fluid: analysis and numerical studies
… small-amplitude oscillations of a droplet of a yield stress fluid under the action of surface tension forces. The problem is treated both analytically and numerically. In particular, we address the question if there exists a finite stopping time for an unforced motion of a yield stress fluid …
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Meaningful descriptions of thixotropy and extensibility for yield-stress fluid drop impact on thin films
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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Bulk and micro-scale rheology of an aging, yield stress fluid, with application to magneto-responsive systems
… materials as plastics, paints, oil-drilling fluids, and consumer products. Rheology is also powerful from a scientific perspective because of the correlation between rheological properties and the structure and behavior of matter on microscopic and molecular scales. The developing sub-field …
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Mathematical Analysis on the PEC model for Thixotropic Fluids
A lot of fluids are more complex than water: polymers, paints, gels, ketchup etc., because of big particles and their complicated microstructures, for instance, molecule entanglement. Due to this structure complexity, some material can display that it is still in yielded state when the imposed …
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Rheology and design of yield-stress fluids
Yield-stress fluids are materials that transition from solid-like to fluid-like at a critical applied stress and are currently the most utilized rheological phenomenon. Yield-stress fluids have found use in drug delivery, food products, batteries, surface coatings, 3D printing materials, and many …
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Cubosome and Hexosome Microparticles: Shape, Rheology, and Templating
… and the desired additives are suspended in a yield stress fluid, and transform into liquid crystals with solid-like rheology and controlled size and shape. Cubosomes are polyhedral particles formed by growing facets on precursor droplets. Hexosomes are bicones and spinning tops with rotational …
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Three Experiments on Complex Fluids
The behaviour of complex fluids is fundamentally interesting and important in many applications. This thesis reports on three experiments on the thermal and rheological behaviour of complex fluids. The first is a study of the rheological properties of and heat transport in a saline solution of …
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Rheology of bubbly liquids containing a non-Newtonian continuous phase
… that belongs to a family of yield stress fluids known as Carbopols. Bubbly liquids with air volume fractions in the range 𝜙<sub>a</sub> = 0 − 0.5 were produced by whisking the continuous phase in a planetary mixer. Aeration profiles describing how 𝜙<sub>a</sub> evolved were …
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Advancing techniques for engineered tissue models of the bone marrow
… conditions for gelatin maleimide, enabling microfluidic emulsion of monodisperse, cell-laden microgels. Building on that foundation, we developed a first-generation microgel-based approach toward hematopoietic stem cell-mesenchymal stromal cell co-culture. Through this work, we showed the …
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A viscoelastic constitutive model for thixotropic yield stress fluids: asymptotic and numerical studies of extension
… value problem with a prescribed elongational stress is solved in the limit of large relaxation time. This gives rise to multiple time scales. If the initial stress is less than a critical value, the initial elastic elongation is followed by settling to an unyielded state at the slow time …
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YIELDING PHENOMENA IN MICROGEL SUSPENSIONS ACROSS LENGTH SCALES
… as food and personal care products, are complex fluids with intricate mechanical properties, blending viscous and elastic behaviors, and exhibiting different responses depending on the timescale or applied stress. These properties significantly impact practical functionalities and user …
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Impact cratering with yield-stress fluids
… involve water and granular media, and very few yield-stress fluids like soft materials. Except for the common experiment of a water drop impacting a water pool, in most works the impactor is a solid, non-deformable sphere. However, in the relevant geological process, and in most other …
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Characterize the molecular dynamics of materials for 4D printing
… and 2) translation of rheological behavior of yield stress fluids to quality of printing. These printing-centric approaches are combined in order to advance the field of 4D printing towards fabrication of spatiotemporal patterning to fabricate 4D structures. Polymer/clay composite inks are the …