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 11 of 11 for “"Streaming flows"”.
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Oscillatory and streaming flows in microchannels
This Thesis was approved for publication on 2019-12-03 at 10:21.
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Quantifying particle sorting in microbubble streaming flows
… behaviour of microparticles in a bubble streaming flow. We show that in microchannels, the steady streaming flow generated by an ultrasonically driven semicylindrical microbubble can be combined with a Poiseuille flow to achieve tunable, high throughput, size-sensitive sorting and …
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Microbubble streaming flows for non-invasive particle manipulation and liquid mixing
… actuating mechanism -- microbubble steady streaming flows -- by emphasizing both fundamental understanding and the design and applications of bubble-based microfluidic devices. Under periodic acoustical driving, microbubbles with radius 20 -- 100µm absorbed or attached to a solid wall …
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Particle manipulation by attractive and repulsive forces in 2-D streaming flows
… the trajectory of microparticles as they move in flows which are characterized by the superposition of microbubble streaming and transport flows. Our experimental setup uses steady streaming flow generated by ultrasonically driven semi-cylindrical microbubble combined with Poiseuille flow. …
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Effects of shape geometry in viscous streaming
Viscous streaming flows generated by objects of constant curvature (circular cylinders, infinite plates) have been well understood. Yet, characterization and understanding of such flows when multiple body length- scales are involved has not been looked into, in rigorous detail. We propose a …
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Viscous streaming in 3D and its applications
… scale, a second-order fluid effect—viscous streaming—becomes relevant as a label-free and contactless method for such applications. In this thesis, we extend an existing 3D numerical flow–structure interaction (FSI) solver based on Remeshed Vortex Method (RVM) for the simulation and analysis …
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Quantifying microbubble streaming and its applications
… and exciting ways in which to drive microfluidic flows. A simple and powerful flow actuation method involves the use of acoustically excited microbubbles. For ease of manufacture and flow control, setups have largely focused on microbubbles of semi-cylindrical shape, attached to a wall of the …
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Micron-bubble streaming flow towards micron to sub-micron sized sorting
Micro-bubble streaming flows represent a unique type of actuating mechanism for microfluidics and have demonstrated great potential in the applications of micro-particle manipulation (e.g. size dependent trapping, sorting, and focusing etc.). The main object of this thesis work is to extend towards …
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Fluid flow induced by oscillating bodies and flows in cyclones
… 2-dimensional, incompressible viscous fluid flows induced by a harmonically oscillating cascade, and (ii) the fluid flows in industrial cyclones and their separation efficiencies. In the first part of the thesis we deal with fluid flows induced by harmonically oscillating cascades of …
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Pattern Formation in Active Nematics
… with orientational order and self-sustained flows. Examples include suspensions of cytoskeletal filaments and associated motor proteins, monolayers of epithelial cells plated on a substrate, and bacteria swimming in a nematic liquid crystal. In these systems activity drives the continuous …
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Artificial Micro-Devices: Armoured Microbubbles and a Magnetically Driven Cilium
… ultrasound the bubble oscillates, generating a streaming flow in the surrounding fluid and producing a net force. Motivated by the AMB but considering initially a general setup, using matched asymptotic expansions we calculate the streaming flow around a spherical body undergoing arbitrary, but …