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Tesi sul tema "Cavitation"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 25 luglio 2025

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1

Momma, Takahiro. "Cavitation loading and erosion produced by a cavitating jet." Thesis, University of Nottingham, 1991. http://eprints.nottingham.ac.uk/14102/.

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The aim of the project is to investigate the detail of cavitation loading and erosion process using a submerged jet cavitation technique. Large size cavitating jet apparatus in the University of Nottingham was used with an long orifice nozzle and experiments were carried out using tap water as a test liquid with upstream pressure ranging from 8D-120bar. Distribution of the mean pressure, cavity clouds and cavitation damage on a specimen have been obtained and their mutual relation was discussed. Effects of pressures and stand off distances on the characteristics of the erosion produced by the
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2

Peterson, Ashley Thomas. "Cavitation prediction." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612813.

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3

Johansen, Kristoffer. "Stable-inertial cavitation." Thesis, University of Glasgow, 2018. http://theses.gla.ac.uk/30796/.

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Abstract (sommario):
Research and development of applications utilising acoustic cavitation, particularly medical therapy, is often based on the spectrum of the scattered emissions collected during the cavitation occurrence. There is, however, limited understanding as to how driven bubble behaviour is related to the myriad of non-linear features that can exist within the cavitation noise spectrum, including those commonly reported. Moreover, there is an enduring tendency to classify cavitation activity as either stable or inertial, with no clear delineation between the two categories in terms of associated emissio
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4

Odeyemi, Babatunde O. "Hydrodynamic cavitation : effects of cavitation on inactivation of Escherichia coli (E.coli)." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/11009.

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5

Krahl, Dominik, Jürgen Weber, and Maik Fuchs. "Visualization of cavitation and investigation of cavitation erosion in a valve." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-199616.

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Abstract (sommario):
Avoiding cavitation and especially cavitation erosion are tasks, which have to be considered when working with hydraulics. State of the art is the assessment of the risk of erosion by component testing or to completely avoid cavitation by means of CFD. Another reliable method to assess the risk of cavitation erosion is until now not available. This paper deals with this problem and delivers comparative values for a later method development. In a first step the cavitation of a poppet valve, which controls a methanol flow, is visualized. The resulting three cavitation appearances are deeply exam
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6

Jin, Yong-Hua. "Optical investigations of cavitation." Thesis, Loughborough University, 1995. https://dspace.lboro.ac.uk/2134/27390.

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This doctoral thesis describes the investigation carried out by the author in pursuit of a better understanding of the mechanism of cavitation. To create cavitation bubbles under laboratory conditions, an intense Q-switched Nd:YAG laser was used and the event was captured using a high-speed photography system. Three different aspects concerning the cavitation phenomenon were studied and they were the propagation of acoustic waves in a liquid, the resultant stress waves in a nearby solid medium and the interactions between a bubble and the nearby boundary. Optical measurement techniques, based
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7

Watson, Peter. "Cavitation in human joints." Thesis, Queen's University Belfast, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304536.

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8

Hou, Hang-sheng. "Cavitation instability in solids." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/13697.

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9

Gerold, Bjoern. "Cavitation in focused ultrasound." Thesis, University of Dundee, 2013. https://discovery.dundee.ac.uk/en/studentTheses/f41bf6b9-ae59-4a41-ba29-d5873821418b.

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A novel experimental conguration is developed combining a highintensity focused ultrasound source and a pulsed-laser, for the study of cavitation in a eld typical of those used for therapeutic ultrasound. The sonoptic chamber is specically designed to avoid the formation of acoustic standing waves, known to have a critical in uence on cavitation behaviour. A new technique of laser-nucleated acous- tic cavitation is presented, whereby a laser-pulse of energy below the breakdown threshold for the host medium, acts to nucleate acoustic cavitation in a pre-established eld. This facilitates the inc
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10

Wilms, Jeffrey. "Flow visualization of cavitation." Thesis, Kansas State University, 2013. http://hdl.handle.net/2097/32158.

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Master of Science<br>Department of Mechanical and Nuclear Engineering<br>Mohammad Hosni<br>A typical refrigeration loop is composed of an evaporator, compressor, condenser, and an expansion valve. There are many possible refrigerants that can be used, but the physical properties of water make it ineffective in the traditional refrigeration loop. But if water could be used it would have many advantages as it is abundant, cheap, and is safe for the environment. This research focuses on a different kind of refrigeration loop using water. This new refrigeration loop utilizes water flowing through
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11

Letchford, Nicholas. "Cavitation in lubricating films." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:17a49106-bb6d-443c-be6b-50398bbd4590.

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Abstract (sommario):
Wear and friction are signicant problems in machinery. A particularly harsh environment is the space between the piston ring and cylinder wall of a combustion engine. Lubricant lms are commonly used to mitigate these eects, separating metal to metal contact. The experiments of Zhu and Granick (Langmuir, 18, 2002) attempt to understand how surfactants change the behaviour of lubricating lms. They claim surfactants that have adsorbed onto a solid surface cause the uid to slip past the surface. We hypothesize that their observations could instead be caused by the liquid cavitating. We develop a m
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12

Zuo, Zhigang. "Experimental and Numerical study of Laser-induced Cavitation Bubbles on Warwick Cavitation Rig." Thesis, University of Warwick, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488496.

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As part of the long-term effort for deepening our understanding of the physics of the damage powers of cavitation, a Markov stochastic model has been developed to describe the interaction of bubbles with nearby boundary walls. The objective of the PhD programme is to calibrate the newly designed and purposely constructed venturi-cavitation test rig at Warwick University, on which the Markov model will be studied; and to develop feasible and effective (experimental and numerical) approaches for implementating this stochastic study.
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13

Herbert, Éric. "Cavitation acoustique dans l'eau pure." Phd thesis, Université Paris-Diderot - Paris VII, 2006. http://tel.archives-ouvertes.fr/tel-00139435.

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Tout liquide peut être surchauffé ou détendu au delà de sa courbe d'ébullition. Il est dans un état métastable, jusqu'à ce qu'une bulle de vapeur apparaisse, c'est le phénomène de cavitation. L'étude de la limité de métastabilité renseigne sur la cohésion du liquide et sur son équation d'état. Le cas de l'eau est spécialement intéressant : des théories concurrentes prédisent des variations en température de cette limite qualitativement différentes : monotone (la pression de cavitation augmente avec la température), ou avec un minimum. Nous mettons l'eau sous tension à l'aide d'une onde ultraso
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14

Ewunkem, Asoumu Emmanuel. "Cavitation erosion of engineering materials." Thesis, City University London, 1993. http://openaccess.city.ac.uk/8358/.

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The work presented in this thesis is concerned with evaluating the erosion resistance 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 which were supplied in various condition of heat treatments, ranged from aluminium alloy to nitrided and tool steels. The plastic employed were epoxy resins. These were supplied in two different formulations the "Novala
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15

Pennathur, Sumita 1978. "Micro-scale turbopump blade cavitation." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8719.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2001.<br>Includes bibliographical references (p. 195-196).<br>The possibility of a silicon micro-fabricated turbopump for the use in a micro-fabricated bipropellant liquid rocket engine is of interest. Such a pump might have airfoils on the order of 1mm chord and 0.2mm 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 cavit
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16

Kotopoulis, Spiros. "Biomedical ultrasonics, cavitation, and sonoporation." Thesis, University of Hull, 2011. http://hydra.hull.ac.uk/resources/hull:4746.

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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 manufactured a highfrequency, high-intensity focussed ultrasound transducer, using lithium niobate as the active element. The transducer was capable of creating 2.5×3.4 (mm)2 lesions without affecting surrounding tissue. Such disruptive effects of ultrasound also have applications outside medicine. Since cyanob
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17

Lisle-Taylor, S. C. "Cavitation performance of pumped hydrocarbons." Thesis, Cranfield University, 1997. http://dspace.lib.cranfield.ac.uk/handle/1826/9676.

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18

Herbert, Eric. "Cavitation acoustique dans l'eau pure." Paris 7, 2006. http://www.theses.fr/2006PA077185.

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Abstract (sommario):
Tout liquide peut être surchauffé ou détendu au delà de sa courbe d'ébullition. Il est dans un état métastable, jusqu'à ce qu'une bulle de vapeur apparaisse, c'est le phénomène de cavitation. L'étude de la limité de métastabilité renseigne sur la cohésion du liquide et sur son équation d'état. Le cas de l'eau est spécialement intéressant : des théories concurrentes prédisent des variations en température de cette limite qualitativement différentes : monotone (la pression de cavitation augmente avec la température), ou avec un minimum. Nous mettons l'eau sous tension à l'aide d'uni onde ultraso
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19

Hankey, S. E. "Cavitation erosion of WC-Co." Master's thesis, University of Cape Town, 1987. http://hdl.handle.net/11427/21135.

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Abstract (sommario):
Bibliography: pages 68-70.<br>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. Further characterisation by way of Young's modulus and density of the materials was undertaken. An investigation of the i nfluence of various parameters on cavitation erosion established a binder content dependence on erosion. For two grain sizes, erosion was found to inc
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20

Lesko, Timothy Michael McKoy Vincent. "Chemical effects of acoustic cavitation /." Diss., Pasadena, Calif. : California Institute of Technology, 2004. http://resolver.caltech.edu/CaltechETD:etd-04262004-184449.

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21

He, Bingrong. "An investigation of cavitation thresholds /." Search for this dissertation online, 2004. http://wwwlib.umi.com/cr/ksu/main.

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22

Li, Shengcai. "Cavitation associated low-frequency fluctuation." Thesis, University of Warwick, 1990. http://wrap.warwick.ac.uk/108599/.

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Abstract (sommario):
This self-guided thesis presents the research results of the Cavitation Associated Low-frequency Fluctuation, i. e. one part of the long-term research project on Statistical Characteristics of Cavitation Bubble Collapse Pulses. Associated Low-frequency Fluctuations and Flow Noise which was initiated and carried out by the author in USA. China and UK successively over last 9 years. The background and the objectives of the long-term project is introduced in the thesis through a broad review of the development of the cavitation research in the fields relevant to the project. Then, the observed ph
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23

Pineda, Rondon Saira Freda. "Numerical prediction of cavitation erosion." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEC031/document.

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Abstract (sommario):
La cavitation peut avoir lieu dans les turbines hydrauliques. Ce phénomène se produit lorsque les bulles de vapeur s’effondrent à proximité de la surface de la machine. Ceci entraîne des conséquences négatives, telles que l’érosion, affectant ainsi les performances de la machine. L’effondrement d’une bulle de gaz non-condensable dans l’eau est simulé en utilisant la méthode sans maillage SPH-ALE, qui intègre un modèle pour simuler les écoulements compressibles et multiphases. Le modèle résout les équations de conservation de masse, de quantité de mouvement et d’énergie du système d’Euler, en u
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24

Chebli, Rezki. "Simulation 2D et 3D des écoulements cavitants : développement d'un algorithme original dans Code_Saturne et étude de l'influence de la modélisation de la turbulence." Thesis, Paris, ENSAM, 2014. http://www.theses.fr/2014ENAM0040/document.

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La cavitation est l'un des phénomènes physiques les plus contraignants influençant les performances des machines hydrauliques. Il est donc primordial de savoir prédire son apparition et son développement, et de quantifier les pertes de performances qui lui sont associées. L'objectif de ce travail est de développer un algorithme 3D instationnaire pour la simulation numérique de la cavitation dans le code industriel « Code_Saturne ». Il est basé sur la méthode à pas fractionnaires et préserve le principe du minimum/maximum sur le taux de vide. Un solveur implicite, basé sur l'équation de transpo
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25

Lafond, Maxime. "Confocal Ultrasound for the Potentiation of Chemotherapy by Ultrasonic Cavitation without External Nucleation Agents." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1243/document.

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Le cancer est reconnu comme l'un des principaux enjeux de santé actuels. Même si de grands progrès ont été réalisés dans ce domaine, les effets systémiques des chimiothérapies et le caractère invasif des procédures actuelles de potentialisation (agents physiques) sont autant d'éléments limitants. Les ultrasons se démarquent néanmoins par leur faible morbidité. Appliqués de façon extracorporelle, ils peuvent pénétrer en profondeur dans les tissus et y induire effets thermiques et mécaniques, incluant entre autres la cavitation. La cavitation peut se définir comme la formation et l'oscillation d
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26

Ahmed, Zayed. "Quantitative flow measurement and visualization of cavitation initiation and cavitating flows in a converging-diverging nozzle." Thesis, Kansas State University, 2017. http://hdl.handle.net/2097/35522.

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Master of Science<br>Department of Mechanical and Nuclear Engineering<br>B. Terry Beck<br>Mohammad H. Hosni<br>Cavitation is the formation of vapor phase from the liquid phase by reduction in its absolute pressure below the saturation pressure. Unlike boiling, where the temperature of the liquid is increased to cause vaporization, the reduction in the pressure alone can cause the liquid to turn into vapor. Cavitation is undesirable in many engineering applications as it is associated with reduction in efficiency and is known to cause damage to pump and propeller components. However, the endoth
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27

Guilleumas, Montserrat. "Nucleation and cavitation in liquid helium." Doctoral thesis, Universitat de Barcelona, 1995. http://hdl.handle.net/10803/667593.

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Las transiciones de fase no siempre ocurren bajo condiciones de equilibrio. Un fluido puede ser conducido a un estado metastable. A pesar de ser internamente estable, existe otra configuración con un potencial termodinámico menor, por tanto energéticamente más favorable y a la cual tenderá el sistema. Esta transición está bloqueada por una barrera termodinámica que puede ser superada con resultado de la formación y crecimiento de pequeños nucleos de la nueva fase estable en la fase metastable. Este proceso se llama nucleación (formación de gotas en un vapor sub-enfriado) o cavitacion (burbujas
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28

Zhou, Zhi-ang. "Gas nucleation and cavitation in flotation." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40477.

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The role of gas nucleation and cavitation in flotation has been systemically studied. It was shown theoretically that about a 10 m high recovery zone is required to ensure at least one collision between a particle less than 10 $ mu$m and a bubble, under conventional column flotation conditions, indicating that the collision is the rate limiting step for fine particle flotation. Direct formation of small bubbles on the hydrophobic particle surfaces and in slurry by gas nucleation and cavitation has, therefore, been exploited as a way to accelerate the fine particle collection rate.<br>Experimen
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29

Moule, R. T. "Cavitation erosion in a corrosive environment." Thesis, Coventry University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374256.

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30

Lloyd, James G. "The cavitation phenomenon in nonlinear elasticity." Thesis, University of Bath, 2013. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.589654.

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Abstract (sommario):
This thesis studies the phenomenon of cavitation in nonlinear elasticity. In Chapter 2 we study the problem of cavitation in a ball of elastic material which is subjected to a radial dead-load on its boundary. We show that the rotationally symmetric equilibrium solution, in which a spherical cavity forms at the centre of the deformed ball, cannot be a global energy minimiser. This is achieved by proving the existence of a related axisymmetric homogeneous equilibrium with less energy (our arguments are related to the Rivlin instability in incompressible materials). In Chapter 3 we develop new n
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31

Villeneuve, Randall A. (Randall Alan). "Effects of viscosity on hydrofoil cavitation." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/17325.

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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.<br>Includes bibliographical references (leaves 118-120).<br>by Randall A. Villeneuve.<br>M.S.
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32

Lambaré, Hadrien. "Cavitation quantique dans l'helium-4 superfluide." Paris 6, 1998. http://www.theses.fr/1998PA066539.

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Nous avons etudie experimentalement la cavitation (c'est-a-dire la nucleation de bulles) dans l'helium-4 superfluide. En utilisant un cryostat a dilution, nous avons obtenu les premieres mesures au-dessous de 800 mk, et jusqu'a 65 mk. La nucleation est declenchee par des impulsions ultrasonores focalisees par un transducteur piezo-electrique hemispherique. Nous avons ainsi obtenu des oscillations de pression negative proches de la limite spinodale de l'helium-4 superfluide (estimee a 9. 5 bars a temperature nulle), ou la compressibilite du liquide devient infinie, et ou la barriere d'energie d
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33

Sjöholm, Henrik. "Pressure Effects in Orifice Cavitation Modeling." Thesis, Umeå universitet, Institutionen för fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-176885.

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In this thesis computational models for cavitating flows around orifice plates has been studied and compared. The goal was to fit a model with experimental data and this was done with some success, although problems with numerical stability, long calculation times and geometry overfitting remain. Cavitation is a complex fluid phenomenon that can occur in pressurized liquid flows. It starts when the liquid pressure is lowered below the boiling pressure and water that undergoes cavitation forms vapor which later implodes violently. This process can cause problems such as noise, vibrations and co
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34

Kozák, Jiří. "Cavitation Induced by Rotation of Liquid." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-409529.

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Tato disertační práce se zabývá experimentálním a numerickým výzkumem kavitace vyvolané rotací. Pro potřeby tohoto výzkumu byla využita transparentní osově symetrická Venturiho dýza, díky čemuž bylo možné zkoumat dynamiku kavitujícího proudění pomocí analýzy vysokorychlostních nahrávek.
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35

Pamidi, Taraka Rama Krishna. "Process Intensification by Ultrasound Controlled Cavitation." Licentiate thesis, Luleå tekniska universitet, Drift, underhåll och akustik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-73856.

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Process industries are cornerstones in today’s industrialized society. They contribute significantly in the manufacturing of various goods and products that are used in our day-to-day life. Our society’s paradigm of consumerism accompanied by a rise in global population drives an ever increasing demand for goods. One of many strategies developed to satisfy these demands and at the same time improve production capabilities is known as process intensification. As an example, this can be accomplished by implementation of devices using the principle of hydrodynamic and acoustic cavitation. High-in
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36

Gong, Cuiling 1964. "Ultrasound induced cavitation and sonochemical effects." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9443.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1999.<br>Includes bibliographical references (p. 132-137).<br>The introduction of a strong acoustic field to 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 atmospheres and temperatures on the order of thousands of degrees Kelvin are generated. Under such extreme condit
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37

Davis, R. Ted. "Aerating Butterfly Valves to Suppress Cavitation." DigitalCommons@USU, 1986. https://digitalcommons.usu.edu/etd/3952.

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Proper aeration of cavitating hydraulic equipment can greatly reduce cavitation intensity, noise, and damage. This thesis quantifies the benefit, in terms of damage and noise, from aerating six inch butterfly valve. The incipient damage level of cavitation was obtained for both aerated and non -ae ra ted conditions. The level is defined as one pit per square inch of a soft aluminum test specimen per one minute of operation. A description of the cavitation pits that occurred plus where they appeared is presented. A graph showing the aerated and non-aerated limits of incipient damage is given al
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38

Williams, Scott C. "Cavitation noise in a model spool valve." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/20230.

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39

Whaley, Erica Lee. "The Interaction Between Cavitation and Wear in Enclosed Spaces with Oscillating Boundaries." Miami University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=miami1558435589443526.

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40

Leclercq, Christophe. "Simulation numérique du chargement mécanique en paroi généré par les écoulements cavitants, pour application à l'usure par cavitation des pompes centrifuges." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI119/document.

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Abstract (sommario):
Lors du fonctionnement des machines hydrauliques, le développement de structures de cavitation peut entraîner une chute de performance. De plus, la cavitation peut être responsable de l'usure des pièces mécaniques par érosion. La taille et la vitesse de rotation des pompes étant fortement dépendantes du niveau de cavitation acceptable, la présence de cavitation dans une installation hydraulique est liée à un compromis technico-économique. La prévision de l'érosion de cavitation serait utile à la fois pour améliorer la conception des matériels en projet mais également pour optimiser les période
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41

Sabraoui, Abbas. "Régulation de la cavitation acoustique appliquée à la transfection cellulaire." Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10007.

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Le travail présenté ici porte sur l’étude et le contrôle de la cavitation acoustique dans le but de développer un système de sonoporation efficace pour les cellules en suspension et les cellules adhérentes. Le manuscrit est composé de trois chapitres. Tout d’abord, une revue de la littérature sur les différentes techniques physiques utilisées en transfection cellulaire, et plus particulièrement la sonoporation. Il a été démontré que le principal mécanisme de la sonoporation est étroitement lié au phénomène de cavitation acoustique. Un contrôle de ce phénomène aléatoire apparaît alors intéressa
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42

Haese, Peter Michael. "Interior source methods for planar and axisymmetric supercavitating flows." Title page, contents and abstract only, 2003. http://web4.library.adelaide.edu.au/theses/09PH/09phh136.pdf.

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"May 2003." Bibliography: leaves 125-130. This study considers use of an interior source method for modelling supercavitation in 2-dimensional (planar) and 3-dimensional axisymmetric flows. Aspects considered include the determination of where the fluid separates from the body, the shapes of the cavities formed, the pressure distribution on the body and the pressure on the cavity surface, and the resulting drag and lift forces on the body.
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Pereira, Francisco. "Prédiction de l'érosion de cavitation : approche énergétique /." [S.l.] : [s.n.], 1997. http://library.epfl.ch/theses/?display=detail&nr=1592.

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Cristiano, Antonella. "Fracture by cavitation of model polyurethane elastomers." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2009. http://pastel.archives-ouvertes.fr/pastel-00578499.

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L'objectif principal de cette thèse a été de déterminer le rôle joué par l'architecture macromoléculaire du réseau sur les propriétés élastiques non linéaires, la résistance à la rupture et la résistance à la cavitation sous chargement hydrostatique. Nous avons synthétisé, dans des conditions contrôlées, trois réseaux élastomères dits « modèles » de Polyuréthanne (PU), à partir d'un triisocyanate et de polyether diols isomoléculaires (PPG). Une caractérisation physico-chimique fine des réactifs et des réseaux a été réalisée en utilisant des techniques telles que : RMN, FTIR et fractions solubl
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Eulaerts, Olivier. "Etude physico-chimique de la cavitation acoustique." Doctoral thesis, Universite Libre de Bruxelles, 2001. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211619.

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Chanda, Suranjit Kumar. "Disintegration of sludge using ozone-hydrodynamic cavitation." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43105.

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In our study we applied hydrodynamic cavitation and ozonation both separately and combined, to determine the synergistic effect of these two technologies for sludge disintegration. A 2 mm orifice was used as a cavitation device. Ozone was injected after cavitation at a concentration of 35 mg/L at a flow of 3 Lpm. The sludge was subjected to treatment for 90 minutes in all three cases. In a final step, combined ozone and cavitation was applied to disintegrate the sludge for 10 hours. It was found that the combination of ozonation and cavitation exhibited higher sludge disintegration capacity th
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Gyöngy, Miklós. "Passive cavitation mapping for monitoring ultrasound therapy." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:af6f3c5a-bec5-4378-a617-c89d2b16d95d.

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Cavitation is a phenomenon present during many ultrasound therapies, including the thermal ablation of malignant tissue using high intensity focused ultrasound (HIFU). Inertial cavitation, in particular, has been previously shown to result in increased heat deposition and to be associated with broadband noise emissions that can be readily monitored using a passive receiver without interference from the main ultrasound signal. The present work demonstrates how an array of passive receivers can be used to generate maps of cavitation distribution during HIFU exposure, uncovering a new potential m
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Liverani, Luca. "Cavitation in Real-Size Diesel Injector Nozzles." Thesis, City University London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.525149.

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Joshi, Shrey. "Modélisation de l'érosion de cavitation par SPH." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAI080/document.

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La thèse est organisée autour du développement d'un modèle numérique d’interaction fluide - structure pour simuler la déformation induite dans un matériau solide lors de l’implosion de bulles de cavitation. Le solveur est développé à partir du code open source SPHYSICS_2D utilisant la méthode des Smoothed Particles Hydrodynamics (SPH). Dans cette thèse, le code 2D a été modifié pour traiter le cas de fluides en conditions 2D-axisymétrique. Le solveur solide SPH a été complètement développé en interne en 2D-axisymétrique avec un nouveau schéma pour résoudre les problèmes apparaissant à proximit
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Vyas, Nina. "Imaging dental ultrasonic cavitation and its effects." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7338/.

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Current methods of dental biofilm removal are predominantly mechanical and are not effective in removing it from irregular surfaces in the mouth. Cavitation occurs around dental ultrasonic scalers and may be a more efficient and less damaging technique. Previous work has failed to quantify the cavitation bubble dynamics around ultrasonic scalers and its effects. The aim was to develop imaging and analysis protocols to analyse the cavitation and to investigate its ability to disrupt biofilms and deliver sub-micron particles into dentine. High speed imaging was used to characterise cavitation. I
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