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Dissertations / Theses on the topic 'PIV'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Ruy, Danilo Virges [UNESP]. "Estrutura hamiltoniana da hierarquia PIV." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/92036.

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Made available in DSpace on 2014-06-11T19:25:34Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-02-18Bitstream added on 2014-06-13T19:53:27Z : No. of bitstreams: 1 ruy_dv_me_ift.pdf: 500107 bytes, checksum: fef6f049175c290422f569aa7ad7e26e (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Esta dissertação trata da construção de hierarquias compatíveis com a equação PIV a partir dos modelos: AKNS, dois bósons e dois bósons quadráticos. Também são construidos os problema linear de Jimbo-Miwa dos três modelos e discutimos a hamiltoniana correspondente a equa

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Ruy, Danilo Virges. "Estrutura hamiltoniana da hierarquia PIV /." São Paulo : [s.n.], 2011. http://hdl.handle.net/11449/92036.

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Orientador: Abraham Hirsz Zimerman<br>Banca: Iberê Luiz Caldas<br>Banca: Roberto André Kraenkel<br>Resumo: Esta dissertação trata da construção de hierarquias compatíveis com a equação PIV a partir dos modelos: AKNS, dois bósons e dois bósons quadráticos. Também são construidos os problema linear de Jimbo-Miwa dos três modelos e discutimos a hamiltoniana correspondente a equação PIV a partir do formalismo lagrangiano<br>Abstract: This dissertation contains the construction of compatible hierarchies with the PIV equation from the models: AKNS, two-boson and quadratic two-boson. Also it is build

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3

ALIOUCHOUCHE, NADIA. "Etude d'ecoulements par methode piv." Paris 11, 1997. http://www.theses.fr/1997PA112142.

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Nous avons utilise la velocimetrie par image de particules (piv) pour etudier des ecoulements de fluides dans des situations complexes, soit par leur geometrie comme les milieux poreux, soit par leur mouvement comme les lits fluidises. En effet cet outil de choix par son caractere plein champ instantane permet de traiter le probleme tres important en pratique des ecoulements complexes et instationnaires. La premiere partie de la these decrit la mise au point de l'appareillage et l'analyse des donnees par traitement d'image. Dans une seconde partie, des particules solides entrainees par un liqu

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4

Pan, Xiao Bo. "Advanced technology applied to PIV measurement." Thesis, Heriot-Watt University, 1996. http://hdl.handle.net/10399/737.

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5

Cardesa, Dueñas José Ignacio. "2D PIV study of grid turbulence." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610384.

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6

Balaštík, Milan. "Obliba ovocných piv v České republice." Master's thesis, Česká zemědělská univerzita v Praze, 2017. http://www.nusl.cz/ntk/nusl-262870.

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The main topic of this thesis is the popularity of fruit beers in the Czech Republic. It describes a generic distribution of fruit beers, both abroad and in our country. Shows an overview of large and small manufacturers in this category in the domestic market. It focuses on the current situation flavored beer on domestic and foreign markets, according to the latest data. Based on the survey are analyzed consumer preferences in the domestic market. They are then formulated breweries general recommendations arising from the outcomes of the survey. Subsequently, using basic statistical methods d

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7

Zhang, Jin Bai. "Procédé de traitement anaérobie des boues et de valorisation du biogaz." Thesis, Vandoeuvre-les-Nancy, INPL, 2011. http://www.theses.fr/2011INPL106N/document.

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Ce travail vise à développer une approche originale à micro et à méso-échelle pour étudier divers phénomènes et intensifier les performances du réacteur. A méso-échelle, l'accent est mis sur l'efficacité de la production de biogaz dans un réacteur anaérobie 2D sous différentes conditions hydrodynamiques ainsi qu’à différentes concentrations de substrat. Puis, dans un dispositif microfluidique transparent, une seule granule de différentes tailles a été utilisée sous différentes conditions d'exploitation. Les effets des différentes conditions hydrodynamiques et des concentrations de substrat ass

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Li, H. "CFD and PIV investigations of pipe discontinuities." Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.484975.

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The flow in the intake and exhaust of a typical two- or four-stroke engine is highly unsteady in nature. The unsteady flow can be used to enhance the engines performance, improve its fuel economy and lower its emissions. In order to optimise an engine system it is normal to employ computer simulation. This is only effective if the simulation methods employed are accurate. The aim of the research described in this thesis was to employ experimental techniques to gain a better understanding of the types of unsteady flow found in engine ducts especially at discontinuities such as: sudden expansion

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9

Fetter, Daniel Karl. "PIV measurements within a water analog engine." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0018/MQ54108.pdf.

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10

Franz, R., and U. Hampel. "Strömungsprofilmessungen mittels PIV-Verfahren an einem Stabbündel." Forschungszentrum Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-113907.

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Umströmte Rohr- bzw. Stabbündel sind als Übertrager von Wärmeenergie in einem breiten Spektrum von Anwendungsgebieten zu finden. Beispiele sind Heizkörper, Kühlaggregate, Heizpatronen, industrielle Wärmetauscher und Brennelemente in Kernreaktoren. Für jede dieser Anwendungen besteht die Anforderung, die Wärmeübertragung an den Wärmeübertragerflächen zu optimieren. Dabei besteht eine enge Kopplung zwischen Wärmetransport und Strömungsstruktur. Eine besonders effiziente Form der Wärmeübertragung ist die Verdampfung. Diese wird unter anderem bei Brennelementen in Druckwasserreaktoren genutzt. Hie

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11

Peng, Haiya. "PIV measurements of flow through forming fabrics." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/37737.

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Three-dimensional velocity fields in the single phase approach flow to a multiple layer woven forming fabric were measured using Particle Image Velocimetry (PIV). The measurements were conducted on a scale model of a forming fabric in a water/glycerin flow loop. Each strand on the paper side of the model forming fabric had a filament diameter around 15.4mm, and the loop test section was 310mm squared, permitting the measurement of detailed velocity distributions over multiple strands of the fabric. The flow speed in the loop test section were varied to achieve screen Reynolds numbers (Res), ca

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12

Dietrich, Nicolas. "Étude locale et expérimentale des Phénomènes interfaciaux." Phd thesis, Institut National Polytechnique de Lorraine - INPL, 2008. http://tel.archives-ouvertes.fr/tel-00357211.

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Ce travail est consacré à l'étude expérimentale des écoulements diphasiques et triphasiques d'inclusions (bulles, gouttes, sphères) en milieux tant newtoniens que non newtoniens à l'échelle microscopique et mésoscopique, en utilisant la visualisation par une caméra rapide, la vélocimétrie par images des particules (PIV) ainsi que la micro-vélocimétrie par images des particules.<br /><br />Des bulles et des gouttes ont été étudiées expérimentalement depuis leur formation, en passant par leur déformation jusqu'à leur coalescence. La formation de bulles dans des micro-mélangeurs a été étudiée et

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13

Bossard, Jonathan. "Caractérisation expérimentale du décrochage dynamique dans les hydroliennes à flux transverse par la méthode PIV (Particle Image Velocimetry). Comparaison avec les résultats issus des simulations numériques." Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00848242.

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Cette thèse de doctorat a été réalisée dans le cadre du projet HARVEST, programme de recherche initié en 2001 au LEGI et consacré au développement d'un nouveau concept d'hydrolienne à axe vertical inspiré des turbines Darrieus pour la récupération de l'énergie cinétique des courants marins et fluviaux. Ce travail s'est focalisé sur la mise en place d'un moyen de mesure par Vélocimétrie par Image de Particules deux dimensions - deux composantes (2D-2C) et deux dimensions - trois composantes (2D-3C). L'objectif est d'une part de constituer une base de données expérimentale pour la validation loc

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14

Danhone, Ricardo. "Análise de circulação induzida po MHD em fluido condutor através de velocimetria a laser." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-03032017-150558/.

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O objetivo deste trabalho foi a análise do movimento do fluido dentro de um segmento de vórtice em anel gerado através da ação magnetohidrodinâmica e o monitoramento do seu movimento resultante, de modo a oferecer condições de visualização usando velocimetria a laser com técnica de processamento de imagens de partículas envolvidas na circulação. O objetivo final desta linha de pesquisa é que através de análises de dados como as velocidades envolvidas na circulação obtida, possa modelar corpos em movimento em fluidos, de forma que o arrasto devido ao seu deslocamento possa ser reduzido. O movim

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Cosadia, Imran. "Variabilité cyclique de l'aérodynamique interne d'un moteur diesel : mise en oeuvre de diagnostics optiques pour l'analyse spatiale et temporelle." Toulouse, INPT, 2006. http://www.theses.fr/2006INPT061H.

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La compréhension physique des variations cycliques de l'aérodynamique interne des moteurs Diesel est un enjeu majeur pour la réduction des émissions polluantes. Cette thèse propose une caractérisation expérimentale d'un écoulement de type "swirl", par vélocimétrie laser. Elle démontre que la stabilité cyclique de l'écoulement est affectée par des fluctuations de structures, révélées par une étude des statistiques de la circulation, puis quantifiées par une décomposition orthogonale aux valeurs propres (POD). L'analyse spatiale est finalement complétée par un suivi temporel de l'écoulement comp

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Seim, Bjarte Grytli. "Study of Hydrofoil Wakes Using PIV and CFD." Thesis, Norwegian University of Science and Technology, Department of Energy and Process Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9929.

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<p>In this master thesis the wake of a hydrofoil have been investigated using PIV. The main goal of this work have been to investigate how vortex generators can create mixing and smoothing of the velocity deficit in hydrofoil wakes. This study is motivated by the rotor stator interactions in Francis turbines with the idea that smoother wakes from the stator can reduce the forces on the rotor and hence increase the life span of Francis turbines. A literature survey of foil theory and wake flows have been carried out. This survey motivated the use of a normalization of the velocity in the wake.

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17

Worth, Nicholas. "Tomographic PIV measurement of coherent dissipation scale structures." Thesis, University of Cambridge, 2010. https://www.repository.cam.ac.uk/handle/1810/237242.

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Further understanding the small scale coherent structures which occur in high Reynolds number turbulence would be of enormous benefit. Therefore, the aim of the current project was to make well resolved three-dimensional flow measurements of the mixing flow between counter rotating impellers, using Tomographic Particle Image Velocimetry (TPIV).TPIV software was developed, with a novel approach permitting a significant reduction in processing time, and a series of numerical accuracy studies contributing to the fundamental understanding of this new technique. Basic flow characterisation determin

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18

Gamboa-Marrufo, Mauricio. "Wind engineering applications of particle image velocimetry (PIV)." Thesis, University of Oxford, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.403974.

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19

Singh, Fatehjit. "Micro-PIV measurement of flow through forming fabrics." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/45656.

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This thesis describes an experimental investigation of the flow field upstream of forming fabrics that are typically used in the paper making process. Micro Particle Image Velocimetry was used to measure the velocity distribution upstream of a forming fabric. The velocity upstream of two different types of forming fabrics, namely Monoflex D60TM and IntegraTM, was studied. As expected, the experiments show the existence of a highly variable drainage velocity field upstream of both fabrics. The drainage velocity over the holes can be several times greater than the drainage velocity above the fa

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20

Masullo, Alessandro. "Advanced algorithms for the analysis of PIV images." Thesis, University of Bristol, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.743057.

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21

Williams, Braydon J. "Uncertainty of Stereo PIV Calibration and Self-Calibration." DigitalCommons@USU, 2017. https://digitalcommons.usu.edu/etd/5263.

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Particle image velocimetry (PIV) is a widely used fluid measurement technique. Three dimensional PIV data or stereo PIV is acquired using two cameras. Stereo cameras are calibrated from camera coordinates, pixels, to real world units such as millimeters using calibration models. Stereo calibration is fundamental to the accuracy of a PIV measurement. In this thesis, the accuracy of the stereo calibration is assessed. The mean error of stereo calibration was found to be 0.23%.

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22

Hemmer, Cédric. "Contribution à l'étude du couplage thermo-mécanique entre un émetteur de chauffage et son environnement." Thesis, Reims, 2015. http://www.theses.fr/2015REIMS023.

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Les appareils de chauffage électrique, qui peuvent paraître relativement simples au premier abord car constitués uniquement d’une résistance chauffante électrique encapsulée dans une enveloppe métallique, sont en réalité des échangeurs de chaleur beaucoup plus complexes. Outre la partie régulation, en charge de déterminer à chaque instant la quantité d’énergie à apporter à la pièce pour fournir les températures d’air souhaitées, l’appareil doit assurer une uniformité des températures et des vitesses d’air cohérentes avec le confort thermique désiré et ce, quels que soient son mode de fonctionn

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SORBE, JORGE. "An experimental study in the near field of a turbulent round free jet." Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-17424.

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This work is about the study of the turbulent round jet to low Reynolds number in the outlet of a nozzle due to the countless uses in the industrial field. The objectives of the thesis are the verification of the Particle Image Velocimetry (PIV) data with other methods and authors and the analysis of the near and transition region of the flow. The method has been divided in three parts: processing of the PIV data that has been the normalization and union of the data; validation of the PIV measurement in comparison with other related studies; and the analysis of the near and intermediate field

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Bourget, Baptiste. "Ondes internes, de l'instabilité au mélange. Approche expérimentale." Thesis, Lyon, École normale supérieure, 2014. http://www.theses.fr/2014ENSL0912/document.

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Les ondes internes de gravité jouent un rôle important dans les échanges énergétiques océaniques, en particulier par leur mécanisme d'atténuation. Il est alors crucial de déterminer et de quantifier les différents processus permettant un transfert d'énergie vers les petites échelles et aboutissant ainsi au mélange océanique. Nous avons, pour cela, étudié précisément l'un de ces mécanismes: l'Instabilité Paramétrique Sous-harmonique (PSI). Cette instabilité permet la génération de deux ondes internes, de fréquence et de vecteurs d'ondes différents, à partir d'une onde primaire, par interaction

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Mujal, i. Colilles Anna. "PIV applications in vortex rings and oscillatory boundary layers." Doctoral thesis, Universitat Politècnica de Catalunya, 2013. http://hdl.handle.net/10803/116447.

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Particle Image Velocimetry (PIV) is one of the most used experimental techniques in fluid mechanics to obtain the velocity field of a flow. One of its most celebrated characteristics is that it does not have interference on the phenomenon of study which makes it suitable to describe qualitatively and quantitatively many phenomena either micro or macroscopic. This thesis presents the PIV technique applied to two different fluid mechanic problems: vortex rings impinging permeable boundaries and oscillatory boundary layers in the laminar-to-turbulent regime. The first part of this thesis focuse

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Kunning, Mao. "Strong Authentication Protocol using PIV Card with Mobile Devices." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-128418.

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Nowadays weak single-factor authentication mechanisms like passwords or passphrases are commonly used. Static passwords are easy to use, just remember them in mind. However it has many security weaknesses and even strong passwords are not strong enough. For example, strong secrets are difficult to remember, and people tend to share authentication credentials across systems, which reduce the overall security tremendously. Thus, for security sensitive environment we need strong multi-factors authentication. Smart card based certificate strong authentication solution can be used as a replacement

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Lad, Neetin. "Benchmarking a single-stem PIV endoscope in a spray." Thesis, University of Leicester, 2011. http://hdl.handle.net/2381/10127.

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Flows with a limited optical access for PIV measurement can be probed using endoscopic PIV techniques. Conventional endoscopic PIV utilises two separate probes, one to relay a light sheet and the other to provide imaging optics to capture a two-dimensional image of the flow. This research aims to validate the velocity measurements taken from the novel single-stem endoscopic PIV system. The specific objectives are to determine the accuracy of the single-stem endoscopic PIV result, identify any shortcomings in the technique, and identify improvements for future single-stem endoscopic PIV systems

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Roclawski, Harald. "PIV Measurements of Channel Flow with Multiple Rib Arrangements." UKnowledge, 2001. http://uknowledge.uky.edu/gradschool_theses/303.

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A model of a gas turbine blade cooling channel equipped with turbulators and a backward facing step geometry was examined. Up to four turbulators oriented cross-stream and inclined 45° to the flow direction were mounted in the channel. The blockage ratio b/H of the turbulators and the height h/H of the backward facing step was 0:125 and 0:14 respectively. The number of turbulators as well as their size was varied. In a preliminary investigation, hot-wire and pressure measurements were taken for three different Reynolds numbers (5,000, 12,000, 18,000)in the center plane of the test section. Sub

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Farrugia, N. "Vector-scalar imaging in combustion using PIV and LIF." Thesis, Cranfield University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309583.

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MARTINS, FABIO JESSEN WERNECK DE ALMEIDA. "CHARACTERIZATION OF NEAR-WALL TURBULENT FLOWS BY TOMOGRAPHIC PIV." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2016. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=31573@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>PROGRAMA DE EXCELENCIA ACADEMICA<br>PROGRAMA DE DOUTORADO SANDUÍCHE NO EXTERIOR<br>O estudo fundamental de estruturas turbulentas próximas a paredes é de significativa importância devido ao seu papel dominante em inúmeras aplicações de engenharia. Em escoamentos turbulentos, estruturas de diferentes escalas interagem entre si através de um fenômeno complexo caracterizado por um processo contínuo e auto-sustentável

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Gajdušek, Martin. "Bioflavouring piv pomocí studeného chmelení za použití českých chmelů." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2021. http://www.nusl.cz/ntk/nusl-449727.

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This diploma thesis deals with the influence of dry hopping on selected analytical and sensory properties of beer. The effect of dry hopping was observed using Czech hop varieties Kazbek and Uran, which were added to the wort during the main fermentation phase in doses of 3 and 6 gdm-3. The contact time of hops with wort was 3, 6 and 9 days. The experimental part describes the technology of preparation of the reference beer, in which dry hopping were subsequently performed. A parallel measurement was performed on each sample. In terms of the basic parameters of beer, the effect of dry hopping,

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Pan, Zhao. "Error Propagation Dynamics of PIV-based Pressure Field Calculation." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/6353.

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Particle Image Velocimetry (PIV) based pressure field calculation is becoming increasingly popular in experimental fluid dynamics due to its non-intrusive nature. Errors propagated from PIV results to pressure field calculations are unavoidable, and in most cases, non-negligible. However, the specific dynamics of this error propagation process have not been unveiled. This dissertation examines both why and how errors in the experimental data are propagated to the pressure field by direct analysis of the pressure Poisson equation. Error in the pressure calculations are bounded with the error le

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Luna, Flavia Daylane Tavares de. "Estudo de sedimentador contínuo usando fluidodinâmica computacional." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-22052018-142847/.

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Em virtude da sua facilidade de operação e elevada eficiência, sedimentadores são bastante utilizados pelas indústrias na separação de componentes com diferentes densidades. Porém o desempenho do tanque sedimentador depende do campo de fluxo dentro do equipamento que, por sua vez, é influenciado pelas características dos sólidos em suspensão, da geometria e dimensões do tanque separador. As características hidrodinâmicas em um sedimentador circular vertical foram investigadas no presente trabalho, tanto por abordagens experimentais como numéricas. As experiências foram realizadas por velocimet

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Wei, Fei. "Weighted least-squares finite element methods for PIV data assimilation." Thesis, Montana State University, 2011. http://etd.lib.montana.edu/etd/2011/wei/WeiF0811.pdf.

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The ability to diagnose irregular flow patterns clinically in the left ventricle (LV) is currently very challenging. One potential approach for non-invasively measuring blood flow dynamics in the LV is particle image velocimetry (PIV) using microbubbles. To obtain local flow velocity vectors and velocity maps, PIV software calculates displacements of microbubbles over a given time interval, which is typically determined by the actual frame rate. In addition to the PIV, ultrasound images of the left ventricle can be used to determine the wall position as a function of time, and the inflow and o

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Dominguez, Ontiveros Elvis Efren. "Wall-pressure and PIV analysis for microbubble drag reduction investigation." Texas A&M University, 2004. http://hdl.handle.net/1969.1/2582.

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The effects of microbubbles injection in the boundary layer of a turbulent channel flow are investigated. Electrolysis demonstrated to be an effective method to produce microbubbles with an average diameter of 30 ??m and allowed the placement of microbubbles at desired locations within the boundary layer. Measurement of velocity fluctuations and the instantaneous wall shear stress were carried out in a channel flow facility. The wall shear stress is an important parameter that can help with the characterization of the boundary layer. This parameter can be obtained indirectly by the measure

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Cheminet, Adam. "Development of tomographic PIV for the study of turbulent flows." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLX020/document.

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Cette thèse porte sur le développement de la PIV tomographique (tomo-PIV) pour la mesure d’écoulements turbulents (Elsinga et al 2006). Cette méthode se fonde sur la reconstruction tomographique d’une distribution volumique d’intensité de particules traceuses, à partir de projections enregistrées par des caméras. Les distributions volumiques sont corrélées, fournissant ainsi un champ de déplacement 3D.Les principales avancées de la recherche sur cette technique sont présentées ainsi que les points bloquants. Les efforts ont principalement été portés sur la reconstruction tomographique. La prin

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Comunello, Neodir José. "Estudo de combustão com interação acústica através da técnica PIV." Instituto Tecnológico de Aeronáutica, 2014. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=2951.

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O presente trabalho está inserido no campo de investigação do movimento. Sua finalidade é a compreensão da interação entre o processo de combustão e as ondas acústicas. Experiências anteriores mostraram que sob ondas acústicas e em certas condições, a combustão não pré-misturada pode se comportar como uma combustão pré-misturada nos aspectos de baixa emissão de poluentes e mantendo a característica favorável de não estar sujeita a ignição no compartimento de pré-mistura. A informação sobre o campo de velocidades é fundamental para se entender a interação entre a chama e as ondas acústicas. Ess

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Varon, Eliott. "Contrôle réactif d'écoulements décollés à l'aide de PIV temps réel." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLET008/document.

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Les écoulements décollés sont omniprésents dans la nature comme dans les écoulements industriels (aérodynamique externe des véhicules, des bâtiments, écoulements autour d’aubes de turbines, aérodynamique interne dans des tuyaux...) où ils sont en général sources de nuisances (vibrations, bruit aéroacousitque, forces de traînée ou de portance). Les enjeux associés à la compréhension et à la maîtrise de tels écoulements, caractérisés par une bulle de recirculation, sont donc considérables.Un capteur "visuel" non invasif développé au laboratoire PMMH est d'abord amélioré afin d'accéder en temps r

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Bunjevac, Joseph Antun. "PIV Analysis of Wake Structure of Real Elephant Seal Whiskers." Cleveland State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=csu1501102202600591.

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Gutierrez, Torres Claudia del Carmen. "Modification of turbulent structure in channel flows by microbubble injection close to the wall." Texas A&M University, 2004. http://hdl.handle.net/1969.1/2783.

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An investigation of turbulent structure modification of a boundary layer for a fully developed channel flow by microbubble injection close to the upper wall was carried out using Particle Image Velocimetry (PIV). Two-dimensional velocity components in an x-y plane at Reynolds number of 5128 based on the half height of the channel and bulk velocity were measured. Microbubbles, with an average diameter of 30 ??m were produced by electrolysis and injected in the buffer layer. Different values of the void fraction were attained and used to evaluate the effects of the presence of microbubbles and t

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Zhen, Ling. "Wavelet analysis study of microbubble drag reduction in a boundary channel flow." Texas A&M University, 2004. http://hdl.handle.net/1969.1/3200.

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Particle Image Velocimetry (PIV) and pressure measurement techniques were performed to investigate the drag reduction due to microbubble injection in the boundary layer of a fully developed turbulent channel flow. Two-dimensional full-field velocity components in streamwise-near-wall normal plane of a turbulent channel flow at Reynolds number of 5128 based on the half height of the channel were measured. The influence of the presence of microbubbles in the boundary layer was assessed and compared with single phase channel flow characteristics. A drag reduction of 38.4% was achieved with void f

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Hamdi, Jana. "Reconstruction volumique d’un jet impactant une surface fendue à partir de champs cinématiques obtenus par PIV stéréoscopique." Thesis, La Rochelle, 2017. http://www.theses.fr/2017LAROS027/document.

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Les systèmes de climatisation et de ventilation sont souvent composés de configurations type jets impactant, sur leur partie terminale. Ainsi, les flux d’air soufflés viennent impacter des obstacles munis de fentes, de différentes formes, afin d’améliorer le mélange. Les conditions de confinement et de soufflage provoquent parfois un inconfort au niveau acoustique. Les nuisances acoustiques générées sont dues à un phénomène de boucles de rétroaction se traduisant par l’apparition des sons auto-entretenus. La production du son par un écoulement fluide en champ libre ou en interaction avec une s

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Estrada, Perez Carlos Eduardo. "Analysis, comparison and modification of various Particle Image Velocimetry (PIV) algorithms." Texas A&M University, 2004. http://hdl.handle.net/1969.1/1532.

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A program based on particle tracking velocimetry (PTV) was developed in this work. The program was successfully validated by means of artificial images where parameters such as radius, concentration, and noise were varied in order to test their influence on the results. This program uses the mask cross correlation technique for particle centroid location. The sub-pixel accuracy is achieved using two different methods, the three point Gaussian interpolation method and the center of gravity method. The second method is only used if the first method fails. The object matching algorithm between fr

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Henning, James C. "MEASUREMENT OF AIR FLOW VELOCITIES IN MICROSIZED IONIC WIND PUMPS USING PARTICLE IMAGE VELOCEMITRY." Case Western Reserve University School of Graduate Studies / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=case1365424846.

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Al-Muhammad, Jafar. "Ecoulement dans un canal millimétrique : étude numérique et expérimentale." Thesis, Ecole centrale de Marseille, 2016. http://www.theses.fr/2016ECDM0013/document.

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Dans le contexte actuel de raréfaction de l'eau, une meilleure efficacité de l'utilisation de l'eau est essentielle pour maintenir une croissance économique durable. En France, en période ordinaire, 48% d'eau est utilisé pour l'irrigation. Ce pourcentage augmente jusqu'à 79% en période d'été. Cela souligne la nécessité d'utiliser des méthodes d'irrigation performantes. La micro-irrigation offre la meilleure efficience, cependant, son utilisation n'est pas très répandue. Dans le monde, ce système ne couvre que 3% des terres irriguées et 5% en France, du fait de la sensibilité de ce système au c

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Moutte, Alexandre. "Etude de jets turbulents à masse volumique variable : impact de la variation de masse volumique sur la structure fine et le mélange." Thesis, Ecole centrale de Marseille, 2018. http://www.theses.fr/2018ECDM0003/document.

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Une étude expérimentale du développement de jets turbulents à masse volumique variable est menée. Les comportements axiaux et radiaux des propriétés statistiques moyennes et fluctuantes obtenues sur les champs de vitesse et de concentration sont analysés. Ces résultats apportent une meilleure compréhension des phénomènes de mélange et de l’effet de la variation de densité dans le but d’apporter des données complémentaires pour le développement des calculs numériques et accroître leurs précisions. Les cas étudiés dans cette thèse sont deux jets d’hélium marqués par de la vapeur d’acétone pour d

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Howell, Jaron A. "Distribution of Particle Image Velocimetry (PIV) Errors in a Planar Jet." DigitalCommons@USU, 2018. https://digitalcommons.usu.edu/etd/7004.

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Particle Image Velocimetry (PIV) is an optical fluid measurement technique used to obtain velocity measurements. Two PIV systems were used to capture data simultaneously and measurement error for the MS PIV system is calculated. An investigation of error distribution is performed to determine when uncertainty estimations fail for the CS PIV-UQ method. Investigation of when results from multi pass PIV processing are achieve were performed so that reliable uncertainty estimations are produced with the CS method. An investigation was also performed which determined that error distributions in PIV

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Sigfrids, Timmy. "Hot wire and PIV studies of transonic turbulent wall-bounded flows." Licentiate thesis, KTH, Mechanics, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1577.

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<p>The compressible turbulent boundary layer developing over atwo-dimensional bump which leads to a supersonic pocket with aterminating shock wave has been studied. The measurements havebeen made with hot-wire anemometry and Particle ImageVelocimetry (PIV).</p><p>A method to calibrate hot-wire probes in compressible ow hasbeen developed which take into account not only the ow velocitybut also the inuence of the Mach number, stagnation temperatureand uid density. The calibration unit consists of a small jetow facility, where the temperature can be varied. The hot wiresare calibrated in the pote

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Choi, Hae-Jin. "Kinematics measurements of regular, irregular, and rogue waves by PIV/LDV." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4797.

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A comprehensive experimental study was conducted to produce benchmark wave kinematics data for five different regular waves and the maxima of four different irregular wave trains. Two of the irregular waves generated are in the category of rogue waves. A series of experiments were conducted in a 2-D wave tank at Texas A&M University to measure wave velocities and accelerations using LDV and PIV systems. The wave crests of regular and rogue waves are the focus of this study. With the measured wave velocity field, the wave accelerations were computed using a centered finite difference scheme. Bo

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Vernet, Julie. "Detailed study of steady incylinder flow and turbulence using stereo-PIV." Thesis, KTH, Mekanik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-92165.

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Due to the increase of global warming effects and new legislation in terms of consumption and emissions of engines, it is today of paramount importance to know exactly the flow behavior inside cylinders of engines to be able to improve the combustion process. Until now, at Scania, cylinder heads have been tested in terms of flow coefficient measurements and torque measurements using steady flowrigs. In this project, however, the non-intrusive and optical technique called stereoscopic PIV has been used in ort of this project has been to study and put into place the PIV setup in order to get the

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