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 323 for “"Cavitation"”.
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Hydrodynamic cavitation for effluent treatment: using vortex-based cavitation devices
Hydrodynamic cavitation is the formation, growth and collapse of vapour/gas-filled cavities. The collapsing cavities result in intense shear and formation of hydroxyl radicals thereby leading to physicochemical transformations. These physicochemical effects can be utilised for a variety of …
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Flow visualization of cavitation
… water flowing through a nozzle, initiating cavitation. Cavitation is generally defined as creating vapor from liquid, not through adding heat, but by decreasing the pressure. In a converging/ diverging nozzle, as the cross sectional area is constricted, the velocity of the flow will …
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Cavitation in focused ultrasound
… source and a pulsed-laser, for the study<br/>of cavitation in a field typical of those used for therapeutic ultrasound.<br/>The sonoptic chamber is specifically designed to avoid the formation<br/>of acoustic standing waves, known to have a critical influence<br/>on cavitation behaviour. A new …
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Cavitation erosion of materials
… hydraulic fluids and materials for combating cavitation erosion in hydraulic mining machinery operating,on 5:95 oil-in-water emulsions, Controlled cavitation was generated in the laboratory in a vibratory cavitation apparatus employing the stationery specimen system. The influence of …
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Cavitation instability in solids
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1991.
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Biomedical ultrasonics, cavitation, and sonoporation
This thesis treats biomedical ultrasonics, cavitation and sonoporation. Focussed ultrasound surgery can heat tissue to a temperature that causes protein denaturation and coagulative necrosis. For high-resolution focused ultrasound microsurgery, high working frequencies are necessary. We …
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Cavitation erosion of engineering materials
… or behaviour of various engineering materials to cavitation erosion in a through flow device. A wide range of engineering materials have been utilized, from metal alloys, plastics, ceramics to composiles. These were procured from various industrial and research establishments. The metal alloys …
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Exploring the Limits of Cavitation
Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs
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Cavitation erosion of WC-Co
An investigation involving the vibratory cavitation erosion of WC-Co alloys was undertaken in order to determine the mechanisms of material removal. Nineteen grades of WC-Co alloys were studied. These alloys had been previously characterised according to microstructural and mechanical properties. …
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Micro-scale turbopump blade cavitation
… span and operate at a Reynolds number of 6000. Cavitation is a major technical issue in such a pump, but there is little work in the literature at this length scale. This work documents analytical and experimental investigations of cavitation on millimeter long pump blading. Cavitation inception …
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Removal of Biofilm through Controlled Cavitation
… to the underlying material using controlled cavitation. The proposed method involves sonication or bombarding the material surface with cavitation bubbles to remove the bacterial biofilm.</p> <p>This thesis includes the various experiments done with respect to removal rate for varying …
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Cavitation in Pharmaceutical Manufacturing and Shipping
… the University of Denver demonstrated that fluid cavitation can generate a large number of sub-visible protein particles in ultra clean formulations, but that mitigation can be achieved with fluid property manipulation. The goal of this research was to (1) assess the risk of cavitation under …
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Mechanoluminescence and Sonoluminescence From Acoustic Cavitation
The effect of single-bubble sonoluminescence (SBSL) intensity and spectral profile from the addition of low concentrations of organics to sulfuric acid has been investigated. It was found that the addition of small quantities of organics to sulfuric acid greatly reduced the total SBSL intensity. …
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Effects of viscosity on hydrofoil cavitation
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1993, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1993.
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Creep cavitation in 304 stainless steel
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1980.
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Ultrasound induced cavitation and sonochemical effects
… an aqueous solution results in the generation of cavitation microbubbles. The non-linear motion of these microbubbles focuses energy from the macro-scale acoustic waves to the micro-scale vapor inside the bubbles. As a result, extremely high localized pressures on the order of hundreds of …
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Biofilm Removal with Acoustic Cavitation and Lavage
… of the entire joint. Through acoustic cavitation, it could be possible to remove the biofilm colonies from the infected surface, thus reducing healing time and even eliminating the need to remove and replace the implant. </p><p>In this thesis, biofilm formation was first induced in …
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High-Frequency Ultrasound Drug Delivery and Cavitation
… at 500 kHz. These findings confirmed the role of cavitation in ultrasonic drug release from micelles. A mathematical model of a bubble oscillator was solved to explore the differences in the behavior of a single 10 um bubble under 70 and 500 kHz ultrasound. The dynamics were found to be …
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Sonoluminescence as a probe of acoustic cavitation
… and $\gamma$ (C$\sb{\rm p}$/C$\sb{\rm v}$) on cavitational conditions. As predicted by thermal theories of sonoluminescence, the intensity of excited-state chromium emission decreases with increasing thermal conductivity of the noble gas, and the intensity of sonoluminescence from silicone oil …
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Spatial control of cavitation in therapeutic ultrasound
Inertial cavitation has been implicated as the primary mechanism for a host of emerging applications. In all these applications, the main concern is to induce cavitation in perfectly controlled locations in the field; this means specifically to be able to achieve cavitation threshold at the …
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