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 72 for “"complex fluid"”.
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Understanding Vortex Reconnection in Complex Fluid Flows
Reconnection of wingtip vortices behind aircrafts is thought to be a cause of wake turbulence, detrimental to air traffic control. We observe the reconnection process for three initial vortex tube set-ups; anti-parallel, orthogonal and anti-parallel with axial flow. From these we are able to …
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Complex fluid lubrication mechanics of polyacrylamide surfaces
… new knowledge on the mechanisms that drive the complex interface mechanics of a hydrogel sliding against an impermeable surface.
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Impact, spreading, and drying of complex fluid drops
… into porous substrates, evaporation, and, in complex fluids, compositional redistribution. This thesis investigates how these mechanisms collectively shape the observable footprint and how that footprint can be interpreted in terms of underlying physics. Experiments with human blood on …
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CFD studies of complex fluid flows in pipes
The flow of rheologically complex fluids in industrial equipment poses a number of challenges, not least from a modelling point of view. Research is needed to further understand and be able to predict the flow behaviour of such materials and to investigate ways of improving their processing. This …
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Complex Fluid Dynamics: From Laminar to Geophysical Flows
… and numerical work relating to two problems in fluid flow. We first treat the oldest, hardest, and arguably one of the most important problems in boundary layer theory: determining the drag on a sphere and an infinite cylinder moving at a fixed speed in a highly viscous fluid. We necessarily …
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Parameter Dependent Model Reduction for Complex Fluid Flows
When applying optimization techniques to complex physical systems, using very large numerical models for the solution of a system of parameter dependent partial differential equations (PDEs) is usually intractable. Surrogate models are used to provide an approximation to the high fidelity models …
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Complex fluid dynamical computations via the Finite Volume Method
Numerical simulations of the complex flows of viscoelastic fluids are investigated. The viscoelastic fluids are modelled, primarily, via the Johnson-Segalman constitutive model. Our Numerical approach is based on finite volume method, based on the Johnson-Segalman constitutive model and implemented …
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Intelligent design of microfluidic components for Newtonian and complex fluid systems
Interest in microfluidics has increased dramatically in recent years, with applications spanning a wide range of fields. However, despite several advances, design of microfluidic devices still relies largely on trial-and-error. This thesis aims to go beyond this approach in favour of a rational …
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Rheology of complex fluid films for biological and mechanical adhesive locomotion
Many gastropods, such as snails and slugs, crawl using adhesive locomotion, a technique that allows the organisms to climb walls and walk across ceilings. These animals stick to the crawling surface by excreting a thin layer of biopolymer mucin gel, known as pedal mucus, and their acrobatic ability …
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Prediction, analysis, and learning of advective transport in dynamic fluid flows
… background fields, i.e. advective transport, in fluid dynamical systems has been a widely studied problem. It is of crucial importance in classical fluid mechanics, geophysical flows, micro and nanofluidics, and biological flows. Even though mathematical models that thoroughly describe such …
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Special methods for fluid-object interactions and space-time computations
Simulations of complex fluid-object interactions problems in aeronautics demand robust and sophisticated numerical techniques. The proposed B-FOIST is an efficient library-lookup method for predicting the response of an object to a dominant, arbitrary flow field. B-FOIST predicts the trajectory of …
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Testing the role of corporate social responsibility and crisis response messaging in corporate reputational recovery
The practice of public relations is complex, fluid, and multifaceted (Cancel et al., 1997): Job skills range from relationship building (Wood, 2015), to media relations and crisis communications. Crises draw intense attention from media and publics, and often require immediate crisis communication …
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An experimental investigation of the effects of base bleed in axisymmetric supersonic flow
… bleed is a technique wherein a small quantity of fluid is injected into the base region of a projectile to reduce the base drag. The effects of base bleed on the near-wake flowfield of a cylindrical afterbody in a Mach 2.5 flow have been investigated in the present study. This experimental study …
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CFD Study of Taylor-Like Vortices in Swirling Flows
<p>Swirling flows are complex fluid motions that appear in various natural phenomena and man-made devices. Numerous engineering applications such as turbomachinery, jet engine combustion chambers, mixing tanks and industrial burners involve swirling flows. This wide range of applications is due to …
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Soft hydrated sliding interfaces as complex fluids
… material lubrication are due to distinct complex fluid behavior characterized by 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 …
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Signaling Dynamic Authenticity as a Leader
… Dynamic authenticity is developmental, complex, fluid, paradoxical, non-linear, personality dependent, situation dependent, and context dependent. As such, self-verification functions as an external reference system and awareness enhancer on a leader’s personal growth journey.</p>
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Rheology and Processing of Animal and Plant-Based Dense Emulsions
… make the real mayonnaise into such an appetizing complex fluid. We find that commercially available vegan mayos can emulate the apparent yield stress and shear thinning of yolk-based mayonnaise by the combined influence of plant-based proteins (like chickpea) and polysaccharide thickeners. …
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Headteachers’ responses to government policy on primary education 1988 to 2005
… these initiatives into school contexts which are complex, fluid systems, and where interpersonal and personal-contextual relationships play an important part. The schools are part of the wider government policy context, which itself has significant effects on schools. This study investigated how …
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Three-dimensional particle tracking velocimetry for turbulence applications
… principles. This technique allows to investigate complex fluid flows by measuring velocity and acceleration along particle trajectories. Implementing and optimizing the technique is, however, a somewhat di - cult task involving accurate optical set-up, volumetric illumination, precise calibration …
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Error Transport Equations for Unsteady Discontinuous Applications
Computational Fluid Dynamics (CFD) has been pivotal in scientific computing, providing critical insights into complex fluid dynamics unattainable through traditional experimental methods. Despite its widespread use, the accuracy of CFD results remains contingent upon the underlying modeling and …
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