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 10 of 10 for “"Chaotic Mixing"”.
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Topological chaos and chaotic mixing of viscous flows
… fluid or a microfluidic system, efficient mixing becomes a challenge. However, 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 …
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Investigation of chaotic mixing in laminar fluid systems by the use of computational fluid dynamics
This work presents significant development into chaotic mixing induced through periodic boundaries and twisting flows. Three-dimensional closed and throughput domains are shown to exhibit chaotic motion under both time periodic and time independent boundary motions, A property is developed …
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The rotor-oscillator flow : searching for coherence amidst chaos
Chaotic mixing of highly viscous fluids is common in many biological and industrial processes. This study aims to gain insight about the properties of such common processes by examining one particular case of viscous, chaotic mixing: the rotor-oscillator flow. For some couplings of the rotor motion …
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Numerical modelling of hydrodynamic and solute transport processes in shallow water environment
… the model is applied to investigate wind-induced chaotic mixing in a circular shallow basin. The effect of diffusive processes on the chaotic mixing is investigated. The results of the first stage research provide a guideline for properly presenting the outputs of the random walk method for …
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Novel Inorganic Photoresists for Three-Dimensional Microfabrication
… and micro-optical components such as chaotic mixing elements or 3D photonic crystals. Several inorganic photoresist systems have been developed or adapted for these purposes. The first resist system is based on silica microspheres with various polymer brush coatings that impart …
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A numerical study on microbubble mixer
This text comprises a numerical study of the mixing performance on the micromixer, a device which actuates steady streaming by semi-cylindrical sessile bubble oscillations. The mixer's capability of producing chaotic mixing is confirmed and a numerical simulation that is in good agreement with the …
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Physics and Applications of a PDMS Based Centrifugal Microfluidic System
… governor system can effectively agitate the chaotic mixing of the sample liquids by periodically deflecting the PDMS membrane of the mixing chamber. The mixing effect can thus be enhanced.
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Advances in biophysical characterisation through micron scale flow engineering
… where, in contrast to macroscale systems, chaotic mixing of fluids and the molecules therein was suppressed. In this manner, I was able to dispense with the support structures that prevent mixing in conventional protein analysis platforms and decrease analysis times by orders of magnitude, …
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Resonances and Mixing in Confined Time-dependent Stokes Flows: The experiments, Numerics, and Analytics
Mixing in Stokes flows is notoriously difficult to achieve. With characteristic scales of the flows being too small for the turbulence to be present, and too large for the molecular diffusion to be significant, the chaotic advection presents almost the only mechanism that can lead to mixing. …
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On Enforcing Maximum Principles and Element-Wise Species Balance for Advective-Diffusive-Reactive Systems
This dissertation aims at developing robust numerical methodologies to solve advective-diffusive-reactive systems that provide accurate and physical solutions for a wide range of input data (e.g., Péclet and Damköhler numbers) and for complicated geometries. It is well-known that physical …