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 20 of 34 for “"Thixotropy"”.
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Applications of recovery rheology: Psychorheology, thixotropy, and beyond
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01
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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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The rheological complexity of waxy crude oils : yielding, thixotropy and shear heterogeneities
… in order to describe this behavior. Finally: thixotropy, which refers to the ability of a fluid to continuously evolve, or age at rest and shear rejuvenate under a constant applied shear rate. A rigorous set of experimental tests is constructed which allow for the appropriate constitutive …
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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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DESIGN AND PERFORMANCE OF SELF-CONSOLIDATING AND THIXOTROPIC ULTRA-HIGH-PERFORMANCE CONCRETE FOR INFRASTRUCTURE CONSTRUCTION AND REHABILITATION
… consistency and the other with improved thixotropy. Tailoring the rheological properties of low yield stress UHPC can improve dispersion and orientation of steel fibers used in the design of UHPC, hence enhancing the tensile and flexural properties. Similarly, improving the thixotropy of …
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Investigation of aqueous kaolin suspensions : a rheological and sedimentation volume study
… show low viscosity, significant elasticity, and thixotropy as well. The aim of this investigation is to find such a composition of above components which show the above mentioned theological properties. The colloid interactions were studied by the theological and sedimentation volumes …
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Elucidating bioadhesive processes in nasal drug delivery systems
… weight expressed the highest viscosity. Thixotropy, a vital property in mucoadhesion, was also assessed. The greatest thixotropy was found with polymers of increasing molecular weight whereas low molecular weight polymers exhibited little or no thixotropy. As expected, high molecular …
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Mechanism of nonlinear biodynamic response of the human body exposed to whole-body vibration
… that either active muscular activity or passive thixotropy of soft tissues is the primary cause of the nonlinearity. The principal objective of this thesis is to identify, and provide experimental evidence of, the primary causal mechanism for the biodynamic nonlinearity. With 0.5 to 20 Hz …
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The rheological properties of aqueous polyacrylamide solutions
… concentrations. Three different behaviors of thixotropy test have been observed--thixotropy, antithixotropy, and time dependent. Finally, the viscous part of PAM solutions was always higher than the elastic part.
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Modelling Tremie Concrete Placement in Deep Foundations
… integrating the Papanastasiou-Bingham model with thixotropy equations was developed, enabling the simulation of thixotropic behaviour of Tremie Concrete in the Material Point Method framework. The novel model revealed a decline in concrete workability during simulations of the Slump-flow and L-box …
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Characterisation and Modelling for Elastomeric and Gel-Like Magnetorheological Materials
… and validated the experimental results. Finally, thixotropy of MR gel is characterised by a proposed test protocol considering the variables of shear rate, magnetic field, shearing time and resting time. A thixotropy model for MR gel is proposed and agrees well with the experimental date under all …
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A viscoelastic constitutive model for thixotropic yield stress fluids: asymptotic and numerical studies of extension
… yielding and hysteresis, both associated with thixotropy in complex fluids.
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Study of the rheological properties of nomex fibrids
… flows. Yield stress, strong shear thinning, thixotropy, and strong dispersion effects were observed, and these are consistent with observed equilibrium structures. Intrinsic viscosity measurements revealed Einstein coefficients about 200 times larger than the corresponding value for spheres, …
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Soft hydrated sliding interfaces as complex fluids
… weakly or strongly time-dependent response and thixotropy-like hysteresis. Tribo-rheometry is particularly suited to uncover the lubrication mechanisms of complex interfaces such as are formed with hydrated hydrogel surfaces and biological surfaces.
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Thixotropic-viscoelastic rheological fingerprints in large amplitude oscillatory shear
… defined for capturing both viscoelasticity and thixotropy with a minimum number of model parameters. Then the use of LAOS is demonstrated as we explore this model response as a function of four dimensionless parameters: two LAOStrain deformation parameters (the Deborah number and the Wiessenberg …
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Ensaios triaxiais dinâmicos de solos argilosos
… and delay between compaction and testing (thixotropy), on the correlation between deformations - recoverable and permanent - and the number of load applications. Bi-linear and linear correlations between resilient modulus and the deviator stress were obtained. Confining pressure has little …
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Effect of nonionic surfactant (X-100) on the rheological properties of aqueous polyacrylamide solutions
… behavior, yield stress, creep and recovery, thixotropy, transient shear stress response, and dynamic response. Results have shown a dramatic decrease in the surface tension with increasing surfactant up to the critical concentration. Polyacrylamide solutions have shown three different …
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Mathematical Analysis on the PEC model for Thixotropic Fluids
… stress is released. This is referred to as thixotropy. This dissertation establishes mathematical analysis on a thixotropic yield stress fluid using a viscoelastic model under the limit that the ratio of retardation time versus relaxation time approaches zero. The differential equation model …
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Formwork pressure and rheology of self consolidating concrete
… drop over time was highly dependent on the thixotropy which can be measured from static yield stress and dynamic yield stress gain over time. So a method for achieving the accurate yield stress values using the ICAR rheometer was developed. The accuracy of the pressure data obtained using …
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Multiscale environmental flow dynamics: particle settling, turbulence modulation, and tornadic vortices
… ages, confirming that weak viscoelasticity and thixotropy provide passive spectral filtering of near‑wall turbulence. Building on these insights, the third study constitutes a first step toward coupling particulate matter with tornado‑like vortices. A customized vortex simulator demonstrates …
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