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Dissertations / Theses on the topic 'Vapour expansion'

Author: Grafiati
Published: 8 June 2024
Last updated: 31 July 2025

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1

Poullain, Thomas. "Etude numérique et expérimentale de l’évaporation sous vide d’alliages métalliques : application à la refusion VAR de Zircaloy-4." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0189.

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La maitrise de la composition et de la ségrégation chimique est essentielle lors de l’élaboration de matériaux à forte valeur ajoutée, comme les alliages de zirconium à destination de l’industrie nucléaire. L’élaboration sous vide permet d’obtenir des lingots d’une très grande pureté mais elle présente aussi une contrainte supplémentaire concernant la maitrise de la teneur en éléments d’alliage volatiles. Les travaux présentés dans ce document visent à améliorer la prédiction de la cinétique d’appauvrissement en espèces métalliques volatiles lors de l’élaboration sous vide et en particulier lo
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2

Semeraro, Emanuele. "Experimental investigation on hydrodynamic phenomena associated with a sudden gas expansion in a narrow channel." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066516/document.

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La vaporisation rapide du sodium liquide surchauffé est supposée être à l’origine des arrêts automatiques pour réactivité négative du réacteur Phénix.Un dispositif expérimental a été mis en œuvre pour reproduire la détente d'un gaz pressurisé, repoussant un liquide dans un canal de section rectangulaire très allongée.L’interface qui sépare les deux fluides, initialement plate, ondule du fait d'instabilités de Rayleigh-Taylor dont le caractère 2D est garanti par le rapport d'aspect de la section du canal. L’aire interfaciale augmente d'un facteur 50.L’expansion du gaz peut être divisée en deux
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3

Hwang, Moonkyu. "Numerical modeling of the expansion phase of vapor explosions." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/16761.

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4

Souza, Rafaela Faciola Coelho de. "Estudo da influência da sucção na pressão de expansão de materiais argilosos com a técnica da transferência de vapor." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/18/18132/tde-19102015-105616/.

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Este trabalho apresenta a quantificação da expansão e suas características, principalmente a influência da sucção, em amostras de materiais sedimentares argilosos provenientes da Formação Corumbataí, aflorantes no interior do estado de São Paulo. Foram testadas amostras indeformadas, e amostras destorroadas e compactadas em diferentes umidades, em ensaios de pressão de expansão a volume constante por inundação, e também, com sucção controlada por meio da técnica da transferência de vapor. Foram ensaiadas, ainda, misturas compactadas desse material com bentonita em diferentes proporções, e mist
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5

Akraiam, Atea I. Bubaker. "Metal cluster production by condensation of metal vapour in supersonic expansions and by aggregation in droplets." Thesis, University of Leicester, 2015. http://hdl.handle.net/2381/31834.

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Metal clusters have been produced by condensation of metal atoms on or inside small argon clusters and by collision of supersonic atomic argon beams with atomic metal vapours. A key parameter in both processes is the metal atom particle density. For iron, metal particle densities above a thermal open crucible-type evaporator were determined using quartz-micro-balance mass flux measurements, revealing a point-source-like dependence on the distance from the crucible. For silver atoms the particle densities were also determined using scattering from small argon clusters. Formation and soft-deposi
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6

Suardin, Jaffee Arizon. "The application of expansion foam on liquefied natural gas (LNG) to suppress LNG vapor and LNG pool fire thermal radiation." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2906.

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7

SILVEIRA, HELVECIO C. K. da. "Analise de integridade estrutural de tubos de geradores de vapor deteriorados por corrosao sob tensao pelo primario na regiao de transicao de expansao junto ao espelho." reponame:Repositório Institucional do IPEN, 2002. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11035.

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Made available in DSpace on 2014-10-09T12:47:15Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:08:43Z (GMT). No. of bitstreams: 1 07971.pdf: 6425112 bytes, checksum: 2adaba2434371c9ca93a67fa4d783fb9 (MD5)<br>Dissertacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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8

Patiño, Pérez Jorge. "Experimentación de nuevas configuraciones destinadas a la mejora del COP en ciclos de compresión de vapor que utilizan CO2 como refrigerante." Doctoral thesis, Universitat Jaume I, 2013. http://hdl.handle.net/10803/125529.

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La creciente demanda del confort humano está obligando a la comunidad científica a buscar nuevas técnicas que permitan aprovechar al máximo los recursos disponibles. Gran parte de esta demanda es consumida por sistemas de producción de frío basados en la compresión de vapor, por tanto, constituye uno de los sectores estratégicos a tener en cuenta para contribuir al desarrollo sostenible mediante la optimización energética de las instalaciones frigoríficas. Además de la búsqueda de soluciones eficientes desde un punto de vista energético, la comunidad científica dirige sus esfuerzos en la búsqu
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9

Gana, Inès. "Caractérisation physique et chimique des substances à activité thérapeutique : application aux études de profil de stabilité et de préformulation." Thesis, Sorbonne Paris Cité, 2015. http://www.theses.fr/2015USPCB164/document.

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Le développement d’un médicament pour une cible thérapeutique donnée passe par plusieurs étapes qui se résument en une étape de criblage, une phase préclinique et plusieurs phases cliniques. Ces étapes permettent de sélectionner une substance active et de démontrer son efficacité thérapeutique et sa sécurité toxicologique. Ces deux critères définissent la qualité du médicament qui, une fois démontrée, doit être garantie pendant toute sa durée de validité. La qualité est évaluée au moyen d’études de stabilité qui sont réalisées d’abord sur la matière première de la substance active au cours de
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10

Glos, Jan. "Modelování a řízení toků elektrické a tepelné energie v plně elektrických automobilech." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-433039.

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Systematické řízení tepelných a elektrických toků v plně elektrických automobilech se stává velmi důležitým, protože v těchto typech automobilů není k dispozici dostatek odpadního tepla pro vytápění kabiny. Aby v zimním období nedocházelo ke snížení dojezdu, je nutné použití technologií, které umožní snížení spotřeby energie nutné k vytápění kabiny (např. tepelné čerpadlo, zásobník tepla). Je také zapotřebí vytvořit řídicí algoritmy pro tato zařízení, aby byl zajištěn jejich optimální provoz. V letním období je nezbytné řídit tepelné toky v rámci elektromobilu tak, aby nedocházelo k nadměrnému
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11

HANG, THONG. "AN IMPROVED HARD SPHERE EXPANSION CONFORMAL SOLUTION THEORY TO PREDICT VAPOR LIQUID EQUILIBRIA." Thesis, 1986. http://hdl.handle.net/1911/15977.

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The HSE (Hard Sphere Expansion) theory calculates the thermodynamic properties of a mixture by separating its properties into contributions from molecular repulsion, which are calculated directly from a hard sphere mixture equation of state, and other contributions from various types of intermolecular attraction, which are obtained by corresponding states from known values of similar contributions in a pure reference fluid. Shape factors are used to establish conformality between individual constituents and the reference fluid. This theoretically based approach represents composition dependenc
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12

Yun, Geun Woong. "Control of Vapor Dispersion and Pool Fire of Liquefied Natural Gas (LNG) with Expansion Foam." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8279.

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Liquefied Natural Gas (LNG) is flammable when it forms a 5 – 15 percent volumetric concentration mixture with air at atmospheric conditions. When the LNG vapor comes in contact with an ignition source, it may result in fire and/or explosion. Because of flammable characteristics and dense gas behaviors, expansion foam has been recommended as one of the safety provisions for mitigating accidental LNG releases. However, the effectiveness of foam in achieving this objective has not been sufficiently reported in outdoor field tests. Thus, this research focused on experimental determination of the e
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13

KWON, YONG JUNG. "CONFORMAL SOLUTION METHOD WITH THE HARD CONVEX BODY EXPANSION THEORY FOR PREDICTING VAPOR-LIQUID EQUILIBRIA." Thesis, 1986. http://hdl.handle.net/1911/16079.

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Like the hard sphere expansion (HSE) theory, the hard convex body expansion (HCBE) theory separates any residual thermodynamic property into a contribution from molecular repulsion, which is calculated directly from a hard convex body (HCB) equation of state, and other contributions from molecular attraction, which are obtained by the corresponding states principle (CSP) using pure reference fluids. The HSE theory yields good agreement with the experimental thermodynamic data for light hydrocarbon mixture systems. However, there is a limit to molecular size and shape difference in mixtures whe
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14

GALOPPI, GIOVANNI. "DEVELOPMENT OF A RADIAL PISTON EXPANDER FOR VAPOR COMPRESSION CYCLES." Doctoral thesis, 2017. http://hdl.handle.net/2158/1082547.

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In recent years, heat pumps and refrigeration systems are widely used in both residential and industrial applications. The possibility of recovering the large throttling losses by using an expander could give a substantial contribution to the performance improvement. In this thesis, a reciprocating expander developed from a hydraulic motor was numerically and experimentally analyzed. A numerical model was developed to identify the needed small modifications to be made on the expander without change its architecture. Successively, an extensive experimental activity on the modified expander has
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15

CHEN, YING-CHUAN, and 陳穎釧. "Prediction of vapor-liquid equilibria of non-polar fluids by applying a modified hard convex body expansion method." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/40853516121158990673.

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16

O'Donnell, Kane. "Field ionization detection for atom microscopy." Thesis, 2010. http://hdl.handle.net/1959.13/802939.

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Research Doctorate - Doctor of Philosophy (PhD)<br>Helium has the highest ionization energy of any species and is as a consequence difficult to detect by conventional means. On the other hand, it is the ideal surface probe, having no net charge or spin, a low mass and a short de Broglie wavelength. Therefore, there exists a strong incentive to develop a microscopy technique based on helium atom scattering. The purpose of this thesis is to investigate in detail how an efficient helium detector might be developed using the phenomenon of field ionization, an ionization method that relies on quant
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17

O'Donnell, Kane. "Field ionization detection for neutral atom microscopy." 2010. http://hdl.handle.net/1959.13/802939.

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Research Doctorate - Doctor of Philosophy (PhD)<br>Helium has the highest ionization energy of any species and is as a consequence difficult to detect by conventional means. On the other hand, it is the ideal surface probe, having no net charge or spin, a low mass and a short de Broglie wavelength. Therefore, there exists a strong incentive to develop a microscopy technique based on helium atom scattering. The purpose of this thesis is to investigate in detail how an efficient helium detector might be developed using the phenomenon of field ionization, an ionization method that relies on quant
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