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 24 for “"Acoustic streaming"”.
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The effects of acoustic streaming from a resonant bubble on the action potential characteristics of a nerve.
Thesis: M.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1973
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Optimization Of A Non-Contact Single Phase Drive Ultrasonic Micromotor: Via Design And Analysis Of Engineered Stator Curvature And Surface Acoustic Streaming Actuators
… rotation through frictional coupling and acoustic streaming in the rotor-stator gap. Using interferometer measurements, we demonstrate smooth rotation of micromotor at 100 - 500 rpm. We implemented multiple gear coupled surface micromachined ultrasonic motors to achieve direction control, …
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Efeito de um campo ultrasônico sobre a dissolução de KCl em água
An analysis is made of the effect of Acoustic Streaming upon the diffusion of KCl in water in a transient regime. Experimental results show a substantial reduction of the saturation time for diffusion of the salt in water. A theoretical model is suggested for the analysis of streaming adjacent to …
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Ultrasonic agitation for surface plasmon resonance biosensors
… is slow, particularly for large molecules. Acoustic streaming has been proposed as a solution to overcome the limitation of mixing in surface based biosensing devices.<br/><br/>This thesis reviews the effects of integrating ultrasonic technology into surface-based biosensors. The …
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Fundamental research regarding the ultrasonic stirring effects on the microstructure of A356 castings
… primary causes are due to ultrasonic cavitation, acoustic streaming and propagation of ultrasound waves in media. However, the mechanism of how those effects happen are not fully understood and quantified. In this research, molten A356 alloy was treated with high power ultrasound at a frequency of …
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Numerical modelling of electrodeposition process for printed circuit boards manufacturing
… such as forced convection (using a pump) and acoustic streaming (using transducers). In this work, a novel numerical method for explicitly tracking the interface between the deposited metal and the electrolyte is implemented and validated under the conditions of basic electrodeposition using …
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Investigation of Microbubble-enhanced Mild Hyperthermia with Focused Ultrasound for Drug Delivery Enhancement
… concentration that varies with respect to acoustic pressure amplitude that results in enhanced heating and larger lesion formation for ablative purposes. However, no group has investigated bubble-enhanced heating in the context of inducing mild hyperthermia over a larger area. In this work, …
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Experiments and theory of selective assembly using topography and ultrasonically-induced fluid forces
… assessed in association with near-boundary acoustic streaming flow, and its contribution to the present assembly process is discussed.
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Microbiological Study of Bacterial Load Reduction in the Root Canal System Utilizing a Novel ErYagLaser
… Needle Irrigation (SNI), Photon-Induced Photoacoustic Streaming (PIPS) – single pulse laser mode, Shock Wave Enhanced Emission Photo-acoustic Streaming (SWEEPS) – double pulse laser mode, and a baseline control. The study found no significant differences in bacterial load reduction between the …
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Numerical Simulation of Ion Waves in Dusty Plasmas
… using our numerical model. Also, an ion acoustic streaming instability in unmagnetized dusty plasmas due to dust charging is investigated. The numerical simulation results show good agreement with theoretical predictions and provide further insight into dust charging effects on wave modes …
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Comparative Efficacy of MUS System vs Er:YAG Laser System in Reducing Bacterial Biofilms in Root Canals
… modes used in LAI included Photon Induced Photo-acoustic Streaming (PIPS) and Shock Wave Enhanced Emission Photoacoustic Streaming (SWEEPS). To conduct this evaluation, forty extracted human mandibular molars meeting the inclusion criteria were collected, processed, and sterilized following …
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Experimental and numerical investigation of wire waveguides for therapeutic ultrasound angioplasty
… direct ablation, pressure waves, cavitation and acoustic streaming caused by distal-tip displacements at ultrasonic frequencies. Numerical and experimental methods are used to investigate the outputs of the wire waveguides during ultrasonic activation. A commercially available generator and …
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On Health-Related Quality of Life and Diagnostic Improvements in Rhinosinusitis
… was demonstrated that it is possible to induce acoustic streaming in a sinus model, and that the acoustic properties of a fluid can be determined with Doppler ultrasound. The appropriate frequency of the ultrasound was found to be ~5 MHz. The anatomical dimensions of the maxillary and frontal …
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Design of a high intensity ultrasound dispersion cell
… The secondary mechanism was a phenomenon called acoustic streaming which provides a macro mixing effect, also caused by intense ultrasound. Streaming and, even more so, cavitation were difficult to measure and for this reason a refinement of a method to map cavitation fields with aluminium foil …
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Evaluating future biopharmaceutical inspection needs, infrastructure capability gaps, and technology development strategies
… the internship. These include the use of Surface Acoustic Waves (SAW) to agitate heavy particles into suspension through acoustic streaming, enhanced lighting and imaging techniques to better identify particles, and segmented machine vision algorithms. These approaches are part of a larger …
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Acoustofluidic Innovations for Cellular Processing On-Chip
… I characterize both the magnetic and acoustic properties of these particles by quantifying the magnetic susceptibilities and extent of acoustic focusing after 3 seconds for each particle formulation (i.e. 3 wt. % magnetite, 6 wt. % magnetite, 12 wt. % magnetite, 24 wt. % magnetite, and …
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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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Role of cavitation, surfactants, and their synergism in transdermal sonophoresis
… from the frequency-independent process of acoustic streaming. Next, the effects of a non-traditional surfactant on LFS treatment were analyzed through a case study with the commonly used fluorescent dye sulforhodamine B (SRB). SRB is often considered to be a purely hydrophilic molecule, …
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Exploiting the Interplay of Acoustic Waves and Fluid Motion for Particle Manipulation
… is an emerging research field that combines both acoustics and fluid dynamics. With acoustic tweezers technique being developed for years, it is featured for its contactless, noninvasive, and biocompatibility which makes the method suitable for various applications in the field of biology, …
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Influence of ultrasonic cavitation treatment on fragmentation and de-agglomeration of primary intermetallics and oxides formed in Al alloys
… grain refinement by utilising the phenomena of acoustic cavitation that leads to fragmentation/de-agglomeration of solid phases, such as primary intemetallics and oxides, formed during solidification of as-cast alloys. Knowledge of the governing mechanisms associated with fragmentation and …
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