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 12 of 12 for “"Chaotic advection"”.
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Chaotic advection and mixing in a western boundary current-recirculation system : laboratory experiments
… involving hyperbolic points gives rise to a chaotic advection mechanism known as 'lobe dynamics'. These lobes carry fluid in and out of the recirculations, acting as extremely effective stirring mechanisms. I demonstrate the existence of these exchange lobes in the unsteady hyperbolic …
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Chaotic advection, mixing, and property exchange in three-dimensional ocean eddies and gyres
… on the importance of diffusion as compared to chaotic advection for tracers in this system. Three methods are used to quantify the relative contributions: scaling arguments including a Lagrangian Batchelor scale, statistical analysis of ensembles of trajectories, and Nakamura effective …
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Chaotic advection and mixing in a western boundary current-recirculation system : laboratory experiments
… involving hyperbolic points gives rise to a chaotic advection mechanism known as 'lobe dynamics'. These lobes carry fluid in and out of the recirculations, acting as extremely effective stirring mechanisms. I demonstrate the existence of these exchange lobes in the unsteady hyperbolic …
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Chaotic advection, mixing, and property exchange in three-dimensional ocean eddies and gyres
… on the importance of diffusion as compared to chaotic advection for tracers in this system. Three methods are used to quantify the relative contributions: scaling arguments including a Lagrangian Batchelor scale, statistical analysis of ensembles of trajectories, and Nakamura effective …
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Resonances and Mixing in Confined Time-dependent Stokes Flows: The experiments, Numerics, and Analytics
… the molecular diffusion to be significant, the chaotic advection presents almost the only mechanism that can lead to mixing. Unfortunately for mixing, the intrinsic symmetries of the flow create invariant surfaces that act as barriers to mixing. Thus, a key to efficient mixing is to add to the …
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Directed Assembly of Three-Dimensional Microvascular Networks
… process. These vertical towers give rise to chaotic advection of the fluid streams and dramatic improvements in mixing relative to simple straight (1-D) and square-wave (2-D) channels while significantly reducing the device planar footprint.
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Transport-Kinetic Processes and Surface Chemistry in Biosensor Design
… to mix two fluids in bulk solution via ""chaotic advection,"" is used to mix the sample as it passes through a surface plasmon resonance biosensor. These experiments indicate that such ""solution-based"" mixing strategies can be effective in microfluidic biosensors."
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Passive micromixers for DNA analysis using CFD modelling
… a fast digestion process. Mixing is improved by chaotic advection through serpentine mixing channels. This leads to the desired reduction in the fluid diffusion path while at the same time increasing the fluid contact areas. The purpose of this research is to evaluate mixing efficiency in …
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Study of the dynamics of transport and mixing using set oriented methods
… of passively advected particles in the flow are chaotic. The chaotic nature of particle trajectories results in exponential stretching of material lines in the flow. Thus the interface along which diffusion occurs is stretched exponentially leading to efficient mixing. It has been demonstrated …
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Topological chaos and chaotic mixing of viscous flows
… it is possible in a laminar flow to generate chaotic particle trajectories (well-known as chaotic advection), that can lead to effective mixing. This dissertation studies mixing in flows with the limiting case of zero Reynolds numbers that are called Stokes flows and illustrates the practical …
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Chaos in Pulsed Laminar Flow
… a challenging problem in laminar flow systems. Chaotic advection can play an important role in enhancing mixing in such flow. In this thesis, different approaches are used to enhance fluid mixing in two laminar flow systems. In the first system, chaos is generated in a flow between two closely …
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Topological Chaos and Mixing in Lid-Driven Cavities and Rectangular Channels
… diffusion is often negligible compared to advection in the flow. The idea of chaotic advection can be applied in these systems to enhance mixing efficiency. Topological chaos can also lead to efficient and rapid mixing. In this dissertation, an approach to enhance fluid mixing in laminar …