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Dissertations / Theses on the topic 'Cavitation in hydrodynamic machine'

Author: Grafiati

Published: 28 June 2021

Last updated: 29 July 2025

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1

Kadlec, Jan. "Hydraulický návrh induceru palivového čerpadla pro raketový motor." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444265.

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The aim of this masters thesis is hydraulic design of inducer for given pump geometry and operating parameters. The first part of this thesis deals with cavitation problematic in hydrodynamic pumps. Next section describes two-dimensional design of the inducer and according to that, the 3D CAD model of inducer is made. The later part deals with thorough CFD analysis and determination of the main hydraulic parameters of inducer itself and also with whole pump completed with this inducer. The last section is devoted to inducer design improvement.

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2

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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3

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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4

Skelton, Hedley John. "Applying hydrodynamic cavitation to the activated sludge process." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613352.

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5

Tran, David. "Hydrodynamic cavitation applied to food waste anaerobic digestion." Thesis, Linköpings universitet, Tema Miljöförändring, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-128268.

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Innovative pre-treatment methods applied to anaerobic digestion (AD) have developed to enhance the methane yields of food waste. This study investigates hydrodynamic cavitation, which induce disintegration of biomass through microbubble formations, impact on food waste solubilisation and methane production during following AD. Two different sub-streams of food waste (before and after the digestion) pre-treated by hydrodynamic cavitation were evaluated in lab scale for its potential for implementation in a full scale practise. First, the optimum condition for the hydrodynamic cavitation device

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6

Abrahamsson, Louise. "Improving methane production using hydrodynamic cavitation as pre-treatment." Thesis, Linköpings universitet, Tema Miljöförändring, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-128783.

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To develop anaerobic digestion (AD), innovative solutions to increase methane yields in existing AD processes are needed. In particular, the adoption of low energy pre-treatments to enhance biomass biodegradability is needed to provide efficient digestion processes increasing profitability. To obtain these features, hydrodynamic cavitation has been evaluated as an innovative solutions for AD of waste activated sludge (WAS), food waste (FW), macro algae and grass, in comparison with steam explosion (high energy pre-treatment). The effect of these two pre-treatments on the substrates, e.g. parti

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7

Mancuso, Giuseppe. "Enhancement of wastewater and sludge treatment processes by hydrodynamic cavitation." Doctoral thesis, Università degli studi di Trento, 2017. https://hdl.handle.net/11572/367789.

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In the past decades, hydrodynamic cavitation (HC) process was the subject of study by many researchers worldwide. This phenomenon was widely studied in order to understand the reason of its negative effects on hydraulic machinery such as pumps,turbines, valves, etc. Many efforts were made in order to better understand mechanisms of HC process with the main aim of preventing its generation and trying to avoid severe physical damage such as erosions, vibrations and noises. In recent years, in order to cope with a decrease in available water resources worldwide, an increasing demand of water by p

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8

Mancuso, Giuseppe. "Enhancement of wastewater and sludge treatment processes by hydrodynamic cavitation." Doctoral thesis, University of Trento, 2017. http://eprints-phd.biblio.unitn.it/2000/1/PhD_Thesis_Mancuso_Giuseppe.pdf.

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In the past decades, hydrodynamic cavitation (HC) process was the subject of study by many researchers worldwide. This phenomenon was widely studied in order to understand the reason of its negative effects on hydraulic machinery such as pumps,turbines, valves, etc. Many efforts were made in order to better understand mechanisms of HC process with the main aim of preventing its generation and trying to avoid severe physical damage such as erosions, vibrations and noises. In recent years, in order to cope with a decrease in available water resources worldwide, an increasing demand of water by p

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9

Ramirez, David A. "Improvement of Ethanol Production on Dry-Mill Process Using Hydrodynamic Cavitation Pretreatment." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1354646654.

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10

Lunnbäck, Johan. "Hydrodynamic cavitation applied to anaerobic degradation of fats, oils and greases (FOGs)." Thesis, Linköpings universitet, Tema Miljöförändring, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-140685.

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To increase profitability for biogas production, new innovative substrates and condition of operations needs to be implemented. At the current state, fats, oils and greases (FOGs) represent a promising substrate even though it brings operational challenges to the anaerobic digestion process. By utilizing hydrodynamic cavitation (HC) as a pre-treatment of the FOGs, the efficiency of FOGs’ co-digestion with wastewater sludge can be significantly improved. Preliminary experiments conducted on oil and water demonstrates that the HC pre-treatment improves the oil solubilisation as well as forms sta

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11

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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12

Kubina, Dávid. "Dynamika kavitujícího proudění za clonou." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378401.

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Cavitating flow through five perforated plates with different number of holes with preserved constant flow cross-section area in sum were experimentally examined. Dynamic characteristics such as dependence of pressure amplitudes and dominant frequencies on cavitation number in all regimes of cavitating flow: incipient cavitation, partial cavitation, fully developed cavitation and supercavitation are obtained. For determination of dominant frequencies several pressure transducers in two regimes of measurement were used. Results were validated with frequency spectra obtained from picture analysi

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13

Bangaru, Balasundaram. "A detailed investigation of microbial cell disruption by hydrodynamic cavitation for selective product release." Doctoral thesis, University of Cape Town, 2004. http://hdl.handle.net/11427/5345.

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Includes bibliographical references.<br>Hydrodynamic cavitation is a novel method for microbial cell disruption, mediated by intense pressure fluctuations caused by cavity oscillation and collapse. Selective release of intracellular microbial products is desirable to reduce the cost involved in their downstream processing. A study of the process variables that affect microbial cell disruption by hydrodynamic cavitation is presented in order to ascertain the conditions required for a selective release. Two model systems were considered (yeast and E. coil). Enzymes from different locations of th

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14

Hilares, Ruly Terán. "Hydrodynamic cavitation as a new approach for sugarcane bagasse pretreatment aiming to second generation ethanol production." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/97/97131/tde-07082018-153234/.

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Renewable energy sources have been proposed as a viable option to mitigate the consumption and the dependence of fossil fuels. Among the available alternatives, lignocellulosic biomass has shown great potential for bioenergy generation, and biofuels as ethanol can be obtained by fermentation from sugars present in cellulosic and hemicellulosic fractions of biomass. However, for the efficient release of fermentable sugars during the enzymatic hydrolysis step, a pretreatment process is required to modify the material in its structure and composition. In this context, hydrodynamic cavitation (HC)

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15

SWANSON, LUKE A. "A DETAILED EXAMINATION OF THE PRESSURE PRODUCED BY A HYDRODYNAMIC RAM EVENT." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1195587339.

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16

Čupr, Pavel. "Hydroelastic Response of Hydrofoil Under Cavitation Conditions." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-446789.

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Tato disertační práce se zabývá experimentálním a výpočtovým výzkumem přídavných účinků od proudu kapaliny na obtékaný hydraulický profil. Dynamická odezva profilu byla analyzována pro dva typy buzení: buzení odtržením mezní vrstvy a Kármánových vírů a dále buzení pomocí externího budiče připojeného k lopatce. Experimentální měření dynamické odezvy profilu na oba typy buzení bylo provedeno pro lopatku umístěnou v kavitujícím a nekavitujícím proudění. Získané výsledky byly použity pro verifikaci přídavných účinků stanovených s využitím numerického modelování.

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17

Miranda, Gregorio do Couto. "The Detection of Journal Bearing Cavitation with Use of Ultrasound Technology." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1459969270.

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18

Walker, Daniel Lloyd Norris. "The influence of blockage and cavitation on the hydrodynamic performance of ice class propellers in blocked flow." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq23111.pdf.

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19

Bernardi, Jean de. "Aspects expérimentaux et théoriques des instabilités de cavitation dans les turbopompes de moteurs de fusée." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0217.

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Les instabilités hydrauliques et les efforts radiaux générés par la cavitation partielle sur un inducteur de turbopompe ont été étudiés en eau pour les inducteurs des turbopompes à hydrogène et à oxygène du moteur VULCAIN d’ARIANE 5. Nous avons pu établir une méthode d’identification et d’analyse des instabilités à l’aide de la synchronisation de films rapides avec des mesures d’effort, sur l’axe et avec des signaux de pression instationnaire en paroi. Des fréquences caractéristiques du phénomène de cavitation instationnaire ont alors été identifiées à différents points de fonctionnement. Cett

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20

Gomes, Jaime Federici. "Campo de pressões : condições de incipiência à cavitação em vertedouros em degraus com declividade 1V:0,75H." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2006. http://hdl.handle.net/10183/11336.

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As expectativas dinâmicas de um mundo de inovações tecnológicas, consubstanciados por explorações menos agressivas ao meio ambiente, dirigidas a um mercado consumista emergente, representam desafios para soluções de problemas de engenharia dirigidos para diversos segmentos da sociedade. Com o desenvolvimento do concreto compactado com rolo (CCR), a partir dos anos 70, o emprego de vertedouros em degraus em barragens de gravidade tornou-se uma solução atrativa, visto que, proporciona, simultaneamente, o aumento da dissipação da energia do escoamento e a redução do tempo e dos custos de implanta

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21

Ткач, Павло Юрійович, Павел Юрьевич Ткач та Pavlo Yuriiovych Tkach. "Можливість використання програм чисельної гідродинаміки для оцінки кавітаційно-ерозійних якостей гідромаши". Thesis, Сумський державний університет, 2016. http://essuir.sumdu.edu.ua/handle/123456789/45629.

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Сьогодення потребує все більш досконалу розробку проточних частин гідромашин на стадії проектування у максимально стислий час. Такі вимоги можливо забезпечити за допомогою активного залучення програм чисельної гідродинаміки (CFD). Відомо, що результати, отримані за допомогою сучасних програм CFD, мають достатню збіжність з результатами фізичного експерименту в частині отримання інтегральних характеристик гідромашин.

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22

Emerson, Sean Christian. "Synthesis of Nanometer-size Inorganic Materials for the Examination of Particle Size Effects on Heterogeneous Catalysis." Digital WPI, 2000. https://digitalcommons.wpi.edu/etd-dissertations/253.

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The effect of acoustic and hydrodynamic cavitation on the precipitation of inorganic catalytic materials was investigated. The overall objective was to understand the fundamental factors involved in synthesizing nanometer-size catalytic materials in the 1-10 nm range in a cavitating field. Materials with grain sizes in this range have been associated with enhanced catalytic activity compared to larger grain size materials. A new chemical approach was used to produce titania supported gold by coprecipitation with higher gold yields compared to other synthesis methods. Using this approach, it wa

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23

Фесенко, А. В., та Ю. М. Любимий. "Повышение эффективности шлифования при гидродинамической обработке СОЖ". Thesis, Видавництво СумДУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/11459.

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24

Podbevsek, Darjan. "Optical probing of thermodynamic parameters and radical production in cavitating micro-flows." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1210/document.

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Une zone de constriction dans un micro-canal fluidique peut générer, si le débit est suffisant, un écoulement bi-phasique. Ceci est l’origine de la cavitation hydrodynamique. Les échanges de chaleur latente générés par l’apparition et l’implosion des bulles impliquent une variabilité importante de la température dans les zones au-delà de la constriction. En ajoutant des sondes de température nanométriques dans le fluide et en utilisant un microscope confocal on peut déterminer la température en un point. Ainsi on a pu établir des cartographies thermiques en 2 et 3 dimensions à l’intérieur d’un

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25

Hamberg, Micaela, and Signe Dahlin. "Numerical Study on Hydrodynamic Characteristics of Flood Discharge Tunnel in Zipingpu Water Conservancy Project : Using RANS equations and the VOF model." Thesis, Uppsala universitet, Elektricitetslära, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-387206.

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To avoid the large amount of damage that floods can cause, spillway tunnels are used to control water levels. To ensure the safety of water transportation through spillway tunnels, the behaviour of the water throughout the tunnel is important to know. Physical experiments are time consuming and expensive, hence CFD simulations are a profitable option for investigating the performance of the spillway tunnel. In this project, simulations of water flow in a spillway tunnel were executed. A three dimensional model of the spillway tunnel in Zipingpu Water Conservancy Project was created in the soft

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26

Pospíšil, Dan. "Vliv tvaru výstupní hrany lopatkové mříže na parametry hydraulického stroje." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230902.

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Master's thesis deals with possibility of simplifying calculation hydraulic machines by converting the three-dimensional geometry in the plane. The aim is to create modifications of a trailng edge and determine their effect of the hydraulic parameterso of the machine.

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27

Bimestre, Thiago Averaldo. "Modelagem teórica e experimental de um reator de cavitação hidrodinâmica com tubo de Venturi para pré-tratamento de bagaço de cana-de-açúcar /." Guaratinguetá, 2020. http://hdl.handle.net/11449/192156.

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Orientador: Celso Eduardo Tuna<br>Resumo: A agroindústria nacional brasileira dispõe de uma grande variedade de unidades agrícolas que geram elevada quantidade de resíduos como o bagaço de cana-de-açúcar. Mesmo diante da crescente utilização desse material, o excedente ainda é da ordem de milhões de toneladas, causando problemas de estocagem e poluição ambiental. Devido a sua estrutura complexa e sua recalcitrância, a etapa de pré-tratamento representa o desafio mais crítico para a viabilização da utilização do bagaço de cana-de-açúcar dentro do contexto de uma biorrefinaria. O pré-tratamento

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28

Gherca, Andrei. "Modélisation de la lubrification des surfaces texturées - Application à la butée en régime hydrodynamique." Phd thesis, Université de Poitiers, 2013. http://tel.archives-ouvertes.fr/tel-00943143.

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La compréhension et la modélisation d'un contact lubrifié en présence de texturation nécessitent une description physique très fine pour comprendre les analyses contradictoires et pour expliquer les résultats très différents en terme de performance présentés dans la littérature internationale. De nombreuses études théoriques et expérimentales ont montré que la texturation des surfaces pourrait améliorer les caractéristiques tribologiques des contacts. La capacité de charge, le coefficient de frottement et la résistance à l'usure sont les principales caractéristiques susceptibles d'être amélior

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29

Pisklák, Jan. "Vliv přimknutí na tření ve valivém ložisku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230584.

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This master’s thesis describes the influence of conformity on friction in rolling bearings. The coefficient of friction is measured on an experimental machine - Mini Traction Machine 2 – using ball-on-disc method. The results are plotted in graphs which showing the dependence of the coefficient of friction at spin-to-roll ratio for specific conformity, normal load and speed in the contact area. The influence of load, speed or different lubricant viscosity is verified for a given value of conformity. Experimentally obtained data are compared with the mathematical model developed in MatLab, with

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30

Аммар, В. Саід. "Закономірності масообмінних процесів гідрокрекінгу і гідрогенолізу вуглеводнів у роторних гідрокавітаційних апаратах". Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/22748.

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Дисертація на здобуття наукового ступеню кандидата технічних наук за спеціальністю 05.17.08. – процеси та обладнання хімічної технології. − Національний технічний університет "Харківський політехнічний інститут", Харків, 2016. Дисертацію присвячено науковому обґрунтуванню та розробці напрямків інтенсифікації масообмінних процесів нафтопереробки. Показано, що при гідрокавітаційній обробці водно-вуглеводневих емульсій відбувається мікрокрекінг молекул нафти та можлива дисоціація води з утворенням водню та подальшим гідрогенолізом важких фракцій. В результаті фракційної розгонки водопаливних ему

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Аммар, В. Саід. "Закономірності масообмінних процесів гідрокрекінгу і гідрогенолізу вуглеводнів у роторних гідрокавітаційних апаратах". Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/22747.

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Дисертація на здобуття наукового ступеню кандидата технічних наук за спеціальністю 05.17.08. – процеси та обладнання хімічної технології. − Національний технічний університет "Харківський політехнічний інститут", Харків, 2016. Дисертацію присвячено науковому обґрунтуванню та розробці напрямків інтенсифікації масообмінних процесів нафтопереробки. Показано, що при гідрокавітаційній обробці водно-вуглеводневих емульсій відбувається мікрокрекінг молекул нафти та можлива дисоціація води з утворенням водню та подальшим гідрогенолізом важких фракцій. В результаті фракційної розгонки водопаливних емул

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Dakel, Zaki. "Stabilité et dynamique non linéaire de rotors embarqués." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0087/document.

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Les rotors sont excités non seulement par le balourd tournant mais aussi par les différents mouvements de leur support : turbocompresseurs de véhicules, turbomoteurs aéronautiques, pompes à vide portées en sont des exemples industriels. Ainsi la conception de rotors robustes capables de bien fonctionner sous de telles conditions (excitations extrêmes) est nécessaire pour éviter des instabilités, source de défaillance catastrophique. Le présent travail a pour objectif de prévoir le comportement dynamique d’un rotor embarqué monté sur des paliers rigides ou élastiques hydrodynamiques et soumis à

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Rebufa, Jocelyn. "Vibrations de ligne d'arbre sur paliers hydrodynamiques : influence de l'état de surface." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEC044/document.

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Le palier hydrodynamique est une solution de guidage en rotation particulièrement appréciée pour ses caractéristiques d’amortissement à hautes vitesses de rotation. Cependant les performances des machines tournantes lubrifiées par un film fluide sont impactées par des effets non linéaires difficiles à analyser. La prédiction du comportement du système par la simulation nécessite une modélisation avancée de l’écoulement de lubrifiant dans le palier hydrodynamique. Enfin, l’état de surface semble avoir un impact important sur l’écoulement du fluide lubrifiant, lui-même agissant sur les caractéri

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Bruyère, Vincent. "Une modélisation multi-physique et multi-phasique du contact lubrifié." Phd thesis, INSA de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00782322.

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De nombreuses hypothèses sont classiquement utilisées pour décrire le comportement du fluide dans un contact lubrifié : film continu, viscosité constante dans l'épaisseur, film mince, fluide newtonien... Or, certaines s'avèrent erronées dès lors que l'on s'intéresse aux contacts Elasto- HydroDynamiques fortement glissants ou à la répartition du lubrifiant en sortie de contact. Une approche numérique originale, basée sur un retour aux équations de la mécanique des fluides générale et prenant en compte le couplage fluide/solide et les effets thermiques sont proposés ici dans le but d'apporter de

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Фем'як, Я. М. "Підвищення ефективності руйнування гірських порід при бурінні свердловин за рахунок енергії пульсуючих потоків". Thesis, Івано-Франківський національний технічний університет нафти і газу, 2007. http://elar.nung.edu.ua/handle/123456789/4226.

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Захищається 8 наукових праць, які містять теоретичні, експериментальні та промислові дослідження, направлені на покращенням процесу руйнування гірських порід на вибої свердловини трилопатевими долотами з вставками пульсаторів. Запропоновано нову конструкцію гідродинамічного пульсатора з введенням промивальної рідини по дотичному каналу для завихрення потоку рідини в циліндричній частині пульсаційної камери та в дифузорі, в яких виділяється розчинений газ (повітря) у вигляді бульбашок. На основі теоретичних і експериментальних досліджень встановлено виникнення пульсацій в потоці промивальної рі

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Bruyère, Vincent. "Une modélisation multi-physique et multi-phasique du contact lubrifié." Electronic Thesis or Diss., Lyon, INSA, 2012. http://www.theses.fr/2012ISAL0110.

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De nombreuses hypothèses sont classiquement utilisées pour décrire le comportement du fluide dans un contact lubrifié : film continu, viscosité constante dans l’épaisseur, film mince, fluide newtonien… Or, certaines s’avèrent erronées dès lors que l’on s’intéresse aux contacts Elasto- HydroDynamiques fortement glissants ou à la répartition du lubrifiant en sortie de contact. Une approche numérique originale, basée sur un retour aux équations de la mécanique des fluides générale et prenant en compte le couplage fluide/solide et les effets thermiques sont proposés ici dans le but d’apporter des

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Auret, Johannes Gerhardus. "Cavitation erosion : the effect of fluid and flow parameters." Thesis, 2016. http://hdl.handle.net/10539/21329.

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This thesis describes an investigation into the effect of fluid and flow parameters on cavitation dynamics and cavitation erosion. A rotating disc test apparatus was developed fo: dow-type cavitation studies. A vibratory test device was also developed to study the role of cathodic and anodic potentials applied to cavitating bodies. Some major results are given below. Erosion "peaksat about 50°C in water, but under certain conditions material degradation caused by increased corrosion rate cancels out thermodynamic effects at higher temperatures. An erosion peak is also observed as a func

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Liu, Kou-Lin, and 劉國麟. "A Study of Cavitation in a Hydrodynamic Bearing - Finite Elment Analysis." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/45600359827234172214.

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Narasimha, Rao T. V. V. L. "Theoretical and experimental investigation on stability and cavitation of hydrodynamic bearing." Thesis, 2000. http://localhost:8080/xmlui/handle/12345678/4499.

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(6593138), David W. Richardson. "Hydrodynamic Lubrication of Floating Valve Plate in an Axial Piston Pump." Thesis, 2019.

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<p>The valve plate/cylinder block interface in an axial piston pump is often subject to extreme pressures, which can cause wear of the valve plate and ultimately, failure of the pump. The purposes of this study were to: a) experimentally investigate the film thickness generated between a floating valve plate and cylinder block in situ using proximity probes, b) develop a model which can predict the motion, film thickness and pressures of the floating valve plate and corroborate with experimental results, c) investigate surface pockets to provide additional lubricant at the valve plate interfac

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Jose, July. "Modeling cavitation in a high intensity agitation cell." Master's thesis, 2011. http://hdl.handle.net/10048/1914.

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The presence of hydrodynamically generated air bubbles has been observed to enhance fine particle flotation in a high intensity agitation (HIA) flotation cell. In this study, the cavitation in an HIA cell, used in our laboratory, is studied by hydrodynamic computational fluid dynamics. Different types of impellers are studied to obtain flow characteristics such as velocity and pressure distributions and turbulent dissipation rate in a two-baffled HIA cell. A cavitation model in conjunction with a multiphase mixture model is used to predict the vapor generation in the HIA cell. Cavitating flow

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RANI, MANISHA. "BIODIESEL PRODUCTION OF WCO BY HYDRODYNAMIC CAVITATION AND ITS PERFORMANCE TESTING ON A CI ENGINE." Thesis, 2014. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15431.

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Rapid depletion in petroleum reserves, and increasing cost of fuels and increasing pollution in the environment due to these fossil fuels have stimulated the search for the alternatives to petroleum based fuels. Biomass derived vegetable oils are quite promising alternative fuels for agriculture and transport diesel engines. Different type of vegetable oils like jatropha oil, waste cooking oil, linseed oil, sunflower oil, coconut oil, karanja oil etc. can be converted into biodiesel to be used as a bio-fuel. Only problem with Waste Cooking Oil is its high viscosity and low volatility. To

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Sethi, Durjyodhan. "Hydrodynamic analysis of different textured profile thrust bearing." Thesis, 2014. http://ethesis.nitrkl.ac.in/6463/1/e-50.pdf.

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Surface texture in the surface of the thrust bearing reduces the friction coefficient and wear rate of the matting surface. Significant improvement in load carrying capacity, wear resistance and friction coefficient of the tribiological mechanical component can be achieved by forming regular micro structure in form of micro dimple on the thrust pad bearing surface. In the present work numerical analysis is carried out to investigate the effect of spherical, cylindrical, elliptical, rectangular and square texture on the thrust pad hydrodynamic bearing and a comparison is done with the plain thr

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Milly, Paul Jesse. "Utilizing hydrodynamic cavitation and ultraviolet irradiation to improve the saftey of minimally processed fluid food." 2007. http://purl.galileo.usg.edu/uga%5Fetd/milly%5Fpaul%5Fj%5F200705%5Fphd.

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TRIVEDI, DHANANJAY. "AN EXPERIMANTAL ANALYSIS ON BIODIESEL PRODUCTION OF WASTE COOKING OIL WITH HYDRODYNAMIC CAVITATION AND ITS PERFORMENCE TESTING." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14536.

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Dawani, Himalaya. "Analysis of Spherical Texture On Characteristics of Hydrodynamic Journal Beraing." Thesis, 2015. http://ethesis.nitrkl.ac.in/7367/1/109.pdf.

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Texture produced on the surface of hydrodynamic journal bearing have certain changes in the coefficient of friction, load carrying capacity, wear rate, stiffness and damping of the two surfaces which are matting with each other. By creating texture or micro dimple on a hydrodynamic journal bearing, pressure increases and significant improvement has been achieved in its load carrying capacity, lubricant flow rate, coefficient of friction etc. In a present work numerical analysis has been carried out to determine the effect of using negative spherical surface texture on hydrodynamic journal bear

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Walker, Daniel Lloyd Norris. "The influence of blockage and cavitation on the hydrodynamic performance of ice class propellers in blocked flow /." 1996.

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Kishore, M. L. Pavan. "Hydrodynamic Design Structural Analysis and Optimization of Marine Propeller Blade." Thesis, 2017. http://ethesis.nitrkl.ac.in/8711/1/2017_PhD_511ME117_MLPKishore.pdf.

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There are many problems to be addressed in the design of marine propeller blade. Among these, the foremost is the efficiency of the propeller. The design of ship propeller involves a number of competing variables including the rake, pitch distribution and blade surface area. The propeller design also aims at achieving high propulsive efficiency at low levels of noise and vibration with reduced cavitation. All of these factors affect vessels top speed, fuel efficiency, and handling. A thorough understanding of propeller dynamics is necessary to design an efficient and reliable propeller blade.

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Gomes, Mário da Silva. "Cavitação hidrodinâmica para tratamento de águas." Master's thesis, 2015. http://hdl.handle.net/10316/39013.

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Dissertação de Mestrado Integrado em Engenharia Mecânica, especialidade Energia e Ambiente, apresentada à Faculdade de Ciências e Tecnologia da Universidade de Coimbra.<br>O presente trabalho está enquadrado no estudo do fenómeno de cavitação, centrando-se essencialmente na cavitação hidrodinâmica aplicada ao tratamento de águas. Atualmente, o método de tratamento mais utilizado para a desinfeção de águas contaminadas com microrganismos é a cloração. No entanto, a utilização em excesso de cloro, associado a alguns compostos orgânicos, conduz à formação de substâncias cancerígenas potencialment

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GALLO, MIRKO. "Fluctuating hydrodynamics model for homogeneous and heterogeneous vapor bubble nucleation." Doctoral thesis, 2019. http://hdl.handle.net/11573/1255398.

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At the molecular scale, even in conditions of thermodynamic equilibrium, the fluids do not exhibit a deterministic behavior. Going down below the micrometer scale, the effects of thermal fluctuations play a dominant role in the dynamics of the system, calling for a suitable description of thermal fluctuations. These models not only play an important role in physics of fluids, but a deep understanding of these phenomena is necessary for the progress of some of the latest nanotechnology. For instance the modeling of thermal fluctuations is crucial in the design of flow micro-devices, in the stud

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