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 16 of 16 for “"Nonlinear rheology"”.
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Nonlinear rheology of micelles and polymers
… thesis is concerned with the theory of polymer rheology. 'Living polymers' are chain-like structures which closely resemble ordinary polymers, except that they can break and reform reversibly. The best-studied examples are wormlike surfactant micelles. A model for these systems has recently been …
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The linear and nonlinear rheology of multiscale complex fluids
… and predict both the linear as well as the nonlinear rheology of such complex fluids have remained elusive. Moreover, the rheological behavior of these materials under extensional deformations, which is important in applications such as spraying and fiber spinning, is relatively poorly …
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Linear to nonlinear rheology of bread dough and its constituents
… in the solid phase of bread, a link between the rheology of dough and the baked loaf volume has also been established. In this thesis, we first develop consistent and accurate techniques for measuring the rheological properties of the dough. Good experimental techniques and protocols are …
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Towards a deeper understanding of thixotropy via transient nonlinear rheology and scattering
Made available in DSpace on 2021-03-05T21:45:30Z (GMT). No. of bitstreams: 3 CHOI-DISSERTATION-2020.pdf: 7031471 bytes, checksum: 03c4f12f62d5fbabfc825dd79e922dcc (MD5) (Source File) Jiho Choi _ Thesis Format Check for Graduate College Nov 13 2020.docx: 11791381 bytes, checksum: …
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Novel Rheometric Techniques and Constitutive Models for Linear and Nonlinear Rheology: Applications to Polymeric Solutions and Colloidal Gels
… and gas production sectors. Characterizing the rheology, understanding the flow behavior, and modeling the constitutive response of these complex fluids is important for predicting time-varying material performance under various processing conditions, thus helping prevent failures in large-scale …
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Rheology of complex fluid films for biological and mechanical adhesive locomotion
… and inverted positions. To this end, the rheology of gastropod pedal mucus is examined in greater detail than any previously published work. The linear rheological response of pedal mucus is examined with flow, oscillation, and creep tests. Nonlinear rheology is examined with large …
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The effects of particle shape, size, and interaction on colloidal glasses and gels
… in agreement well with theoretical calculations. Nonlinear rheology and yielding behavior of repulsive and attractive spheres and anisotropic particles are examined and understood in terms of barriers constraining motion. The barriers are due to interparticle bonds or cages constraining …
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Capillary breakup of Discontinuously Rate Thickening Suspensions
… limit of slender geometry of the filament. The rheology of the suspension was modeled with a simple function diverging at the deformation rate at which the increase in viscosity becomes appreciable. The governing nonlinear coupled partial differential equations were solved numerically with a …
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Application of Polymer and Nanomaterials for Improving Heavy Oil Recovery
… and diverging pores in porous media, linear and nonlinear rheology were employed to characterize the mechanical and flow behaviors of these hybrid dispersions. Sandpacks were used as the porous media to simulate oil reservoirs. Different hybrid dispersions were injected into sandpacks and the …
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Mathematics, Methods, and Models for Data-Driven Rheology
… yet to make a substantial impact in the field of rheology. Rheological data sets are at once too scarce and too diverse to enable traditional machine learning approaches -- their scarcity a reflection of the time- and material-intensive nature of bulk rheometry, and their diversity a product of …
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The rheological complexity of waxy crude oils : yielding, thixotropy and shear heterogeneities
… the underlying complexities associated with the rheology of waxy crude oils. These complex phenomena are often difficult to both quantify experimentally and capture with existing constitutive models. The contribution of this thesis is therefore to develop a detailed understanding of three of …
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Mechanics of biopolymer networks, stimuli responsive particle suspensions, and their combinations
… physiological use. In part two, the linear and nonlinear rheology of a model system of soft microgel suspensions is investigated. The interaction pair-potential between the microgel is temperature-dependent. By increasing concentration of the suspension, a transition from a viscous liquid to an …
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Understanding self-assembly and flow heterogeneities in poloxamer wormlike micelles
… Additionally, entangled WLMs exhibit unique nonlinear flow behavior such as the formation of shear bands and other flow heterogeneities, which have garnered considerable scientific interest. While often formulated using small molecule ionic surfactants, WLMs can also form in solutions of …
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Time dependence of nonlinear flow dynamics of near hard sphere suspensions
… the viscous behavior dominates, the onset of nonlinearities is driven by increases in rate of strain. At higher deformation frequency, where suspension mechanics is dominated by an elastic response, the nonlinear responses occur when deformation exceeds a characteristic strain. This strain is …
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Nonlinear dynamics of complex fluids in fragmentation and fracture
… complexities associated with varying the rheology of such materials in both shear and elongation. The complex nonlinear rheology of these complex fluids under representative conditions of large strain and deformation rate is difficult to quantify experimentally and is a known challenge for …
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Thixotropic-viscoelastic rheological fingerprints in large amplitude oscillatory shear
… an analytical solution for the asymptotic nonlinearities of this model in LAOS, as well as numerical results for the full nonlinearities. We present these results in a manner that eases the challenges of visualizing a response to four independent parameters. This canonical …