Дисертації з теми "Marangoni Flow in Droplets"
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Alhendal, Yousuf A. "Computational two phase Marangoni flow in a microgravity environment." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/computational-two-phase-marangoni-flow-in-a-microgravity-environment(a3ba6f7f-f619-4bae-a355-e7b007d97e13).html.
Повний текст джерелаSchmitt, Maximilian [Verfasser], Holger [Akademischer Betreuer] Stark, and Uwe [Gutachter] Thiele. "Active emulsion droplets driven by Marangoni flow / Maximilian Schmitt ; Gutachter: Uwe Thiele ; Betreuer: Holger Stark." Berlin : Technische Universität Berlin, 2017. http://d-nb.info/1156010268/34.
Повний текст джерелаLi, Menglin [Verfasser]. "Self-propelled droplet driven by Marangoni flow and its applications / Menglin Li." Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2019. http://d-nb.info/1224474856/34.
Повний текст джерелаJehannin, Marie. "About the role of physico-chemical properties and hydrodynamics on the progress of a precipitation reaction : the case of cerium oxalate particles produced during coalescence of drops." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS265/document.
Повний текст джерелаThe size and morphology control of precipitated solid particles is a major economic issue for numerous industries. For instance, it is interesting for the nuclear industry, concerning the recovery of radioactive species from used nuclear fuel. The precipitates features, which are a key parameter from the post-precipitate processing, depend on the process local mixing conditions. So far, the relationship between precipitation features and hydrodynamic conditions have not been investigated. In this study, a new experimental configuration consisting of coalescing drops is set to investigate the link between reactive crystallization and hydrodynamics. Two configurations of aqueous drops are examined. The first one corresponds to high contact angle drops (>90°) in oil, as a model system for flowing drops, the second one correspond to sessile drops in air with low contact angle (<25°). In both cases, one reactive is dissolved in each drop, namely oxalic acid and cerium nitrate. When both drops get into contact, they may coalesce; the dissolved species mix and react to produce insoluble cerium oxalate. The precipitates features and effect on hydrodynamics are investigated depending on the solvent. In the case of sessile drops in air, the surface tension difference between the drops generates a gradient which induces a Marangoni flow from the low surface tension drop over the high surface tension drop. By setting the surface tension difference between the two drops and thus the Marangoni flow, the hydrodynamics conditions during the drop coalescence could be modified. Diols/water mixtures are used as solvent, in order to fix the surface tension difference between the liquids of both drops regardless from the reactant concentration. More precisely, the used diols, 1,2-propanediol and 1,3-propanediol, are isomer with identical density and close viscosity. By keeping the water volume fraction constant and playing with the 1,2-propanediol and 1,3-propanediol volume fractions of the solvents, the mixtures surface tensions differ up to 10 mN/m for identical/constant reactant concentration, density and viscosity.Three precipitation behaviors were identified for the coalescence of water/diols/recatants drops depending on the oxalic excess. The corresponding precipitates patterns are visualized by optical microscopy and the precipitates are characterized by confocal microscopy SEM, XRD and SAXS measurements. In the intermediate oxalic excess regime, formation of periodic patterns can be observed. These patterns consist in alternating cerium oxalate precipitates with distinct morphologies, namely needles and “microflowers”. Such periodic fringes can be explained by a feedback mechanism between convection, reaction and the diffusion
Tsoumpas, Ioannis. "Experimental study of the evaporation of sessile droplets of perfectly-wetting pure liquids." Doctoral thesis, Universite Libre de Bruxelles, 2014. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209196.
Повний текст джерелаIn general, the thesis starts with a general introduction including but not limited to sessile droplets (Chapter 1). In Chapter 2 we provide a general overview of capillarity-related concepts. Then, in Chapter 3 we present the interferometric setup, along with the liquids and the substrate that is used in the experiments, and also explain the reasons why this particular method is chosen. In Chapter 4 we address, among others, the issue of evaporation-induced contact angles under complete wetting conditions. The behavior of the global evaporation rate is also examined here, whereas in Chapter 5 we discuss the influence of thermocapillary stresses on the shape of strongly evaporating droplets. Finally, before concluding in Chapter 7, we address in Chapter 6 the still open question of the influence of non-equilibrium effects, such as evaporation, on the contact-line pinning at a sharp edge, a phenomenon usually described in the framework of equilibrium thermodynamics. The experimental results obtained are also compared with the predictions of existing theoretical models giving rise to interesting conclusions and promising perspectives for future research.
Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished
Burge, Wayne. "Marangoni Instabilities in Two-Layer Fluid Flow." Thesis, University of East Anglia, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.518388.
Повний текст джерелаWeiss, Michael. "Surfactant adsorption and Marangoni flow in liquid jets." Thesis, University of Oxford, 2004. http://ora.ox.ac.uk/objects/uuid:7e313dbf-30b6-4ad7-8607-c75e89b084eb.
Повний текст джерелаKhaw, Mei Kum. "Studies on Magnetically Actuated Droplets for Digital Microfluidic." Thesis, Griffith University, 2017. http://hdl.handle.net/10072/365947.
Повний текст джерелаThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Engineering
Science, Environment, Engineering and Technology
Full Text
Semenov, Sergey. "Computer simulations of evaporation of sessile liquid droplets on solid substrates." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/10277.
Повний текст джерелаChatterjee, Aniruddha. "Physical and computational models of Marangoni and buoyancy flow during dissolution." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43172.
Повний текст джерелаHuber, Michael R. "An investigation of low Marangoni number fluid flow in a cold corner." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from the National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA271317.
Повний текст джерелаCarle, Florian. "Flow motion in sessile droplets : evaporation and nanoparticles assembly." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4726/document.
Повний текст джерелаSessile droplets are widely found in day to day life: it might be a coffee spilt, rain onto a waterproof raincoat or again, water falling onto a cooking plate. However, despite the vast number of studies devoted to droplets for almost half a century, the fundamental phenomenon of the evaporation of sessile droplets is still a field that attracts a high level of interest due to its wide applicability and the development of new visualisation techniques or new types of complex fluids. This experimental study is focused two distinct aspects:- The evaporation of pure fluids has allow to study hydrothermal waves that appear in the droplets of volatile fluids during phase change. The influence of the type of fluid ---different alcohols and alkanes--- and the gravity levels ---Terrestrial, Lunar and Martian--- is investigated to have a better understanding of the flow motion inside droplet. Moreover, the use of different gravity levels allows to experimentally evidence the contribution of the atmospheric convective transport to sessile droplet evaporation. This investigation has allowed to develop an empirical model to take account of natural convection which greatly increases the evaporation rate in the quasi-steady diffusion-controlled evaporation model.- If complex fluids exhibit an evaporation dynamic similar to pure fluid, other mechanisms come into play, such as gelation, particles organisation and cracks formation. Wetting and different functional groups on the particles graphs will be studied in relation to the final pattern of cracks
Petkovic, Bojan. "Deposition of droplets onto solid objects in aerosol flow." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/20891.
Повний текст джерелаGomes, Zoby Maria Regina. "Liquid Droplets and Gas Interactions in Two-phase Flow." Thesis, Imperial College London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526366.
Повний текст джерелаKoleski, Goce. "Flower-like azimuthal instability of a divergent flow at the water/air interface." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0244.
Повний текст джерелаAxisymmetric flows on a water-air interface prove to be azimuthally unstable. In this thesis work, we design two setups to explore this fact : (1) a small subaquatic fountain propelling a jet against the water-air interface where it creates a centrifugal radial flow, (2) a laser – heated microbead in partial wetting at the surface of water that induces a divergent thermocapillary flow. At sufficiently high jet speeds or laser powers appears a symmetry – breaking of the toroidal base flow in the form of counter – rotating vortex pairs surrounding the source. Morphological traits of the torus and the dipole are uncovered through a wealth of laser tomography and dye injection experiments. In the water jet experiment, we show that the torus size is primarily fixed by the distance between the injector and the surface. In both experiments,the tracking of tracer particles evidences a ‘locked’ interface in the toroidal regime, whereas it ‘unlocks’ when a dipole sets in. Such a phenomenon is conditioned by surface elasticity. Cogent evidence is brought by the elastic response to laser shutdown of a surfactant layer adsorbed at the water surface. Unveiling the key role of surface elasticity in the scenario of the instability is the main achievement of this work.On a theoretical level, we focus on thermocapillary convection induced by a fixed point source of heat sitting across the water-air interface. We solve the incompressible Stokes equation within the water – filled half – space and derive an exact solution to the advective nonlinear regime in the far – field axisymmetric limit. We then lay the groundwork on which to build a model of the instability. This thesis work paves the way for understanding how a hot microsphere found on the water surface triggers such an instability, thereby becoming an ‘active particle’ able to achieve self – propulsion at large speeds
Kufås, Eirik. "Mathematical Modeling of Coalescence of Oil Droplets in Water Flow." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12879.
Повний текст джерелаLi, Yaofa. "Experimental studies of Marangoni convection with buoyancy in simple and binary fluids." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53893.
Повний текст джерелаZhang, Zhongkui. "Modeling of Al evaporation and Marangoni flow in Electron Beam Button Melting of Ti-6Al-4V." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/43996.
Повний текст джерелаTadrous, Ebram. "Experimental investigation of the transition of Marangoni convection around a stationary gas bubble towards turbulent flow." Universitätsverlag Chemnitz, 2020. https://monarch.qucosa.de/id/qucosa%3A74993.
Повний текст джерелаIn dieser Arbeit wird die thermokapillare Konvektion um eine Gasblase unter einer horizontal beheizten Wand unter Gravitationsbedingungen experimentell untersucht. Diese thermokapillare konvektive Strömung jenseits des laminaren stationären Zustands in Richtung turbulenter Strömung steht in dieser Arbeit im Fokus. Im Allgemeinen ist die Marangoni-Konvektion unter Schwerelosigkeitsbedingungen kritischer und wichtiger als auf der Erde. Unter geringen Schwerkraftkräften kann diese durch Oberflächenspannung induzierte Strömung sowohl Wärme- als auch Stoffübergangsprozesse maßgeblich bestimmen. Daher sollte die thermokapillare Konvektion bei Materialproduktionsprozessen im Weltraum berücksichtigt werden. Darüber hinaus können Temperaturgradienten gezielt angewendet werden, um in flüssigen Materialien suspendierte Blasen oder Tropfen zu entfernen oder zu bewegen. Außerdem tritt thermokapillare Strömung in vielen anderen Anwendungen auf, beispielsweise bei der Herstellung von einwandigen Kohlenstoffnanoröhren oder der Herstellung von Einkristallen, um nur einige Beispiele zu nennen. Forscher haben die Marangoni-Konvektion immer als ein wichtiges und interessantes Thema für numerische und experimentelle Studien betrachtet. In Bezug auf die Konfiguration der injizierten Blase unter einer horizontal beheizten Wand wird dieses physikalische Problem hauptsächlich durch eine dimensionslose Kennzahl, die das Verhältnis des durch Kapillarkonvektion induzierten konvektiven Wärmeübertragungs zur Wärmeübertragung durch Leitung darstellt und als Marangoni-Zahl (Mg) bezeichnet wird, definiert. In den letzten Jahrzehnten wurden verschiedene Ansätze zur Beschreibung des Strömungs-Verhaltens bei höheren Marangoni-Zahlen verfolgt. Dabei wurde die Thermokapillarströmung grundsätzlich in ein stabiles laminares und ein nicht laminares (oszillierendes) Verhalten, das durch periodische oder nicht periodische Geschwindigkeit- und Temperatur-Fluktuationen gekennzeichnet ist, eingeteilt. Durch frühere Studien wurde das Regime des Übergangs des thermokapillaren Verhaltens von der periodischen Schwingungszone zur nichtperiodischen gut untersucht. Es fehlen jedoch immer noch detaillierte Informationen über das nichtperiodische Verhalten bei sehr hohen Temperaturgradienten. Daher konzentrieren sich unsere experimentellen Untersuchungen in der vorliegenden Studie hauptsächlich auf die Untersuchung verschiedener Faktoren, die die Nichtperiodizität der konvektiven Thermokapillarströmung beeinflussen, und auf eine Klärung, wie sich diese Strömung unter verschiedenen Randbedingungen über der kritischen Marangoni-Zahl (Mg c ) verhält.Die experimentelle Arbeit wurde sowohl mit einer PIV-Technik als auch mit der Shadowgraph- Technik durchgeführt. Darüber hinaus waren Temperaturmessungen auf Sensorbasis an verschiedenen Stellen in der verwendeten Flüssigkeit um die Luftblase geeignet, um die ungestörten Temperaturgradienten bei verschiedenen Randbedingungen zu bestimmen. Die zeitabhängige Messung sowohl von Geschwindigkeiten als auch von Temperaturen an Orten in der Nähe der Blase lieferte Informationen über das Verhalten der Konvektion der thermokapillaren Strömung. Darüber hinaus wurde durch die Shadowgraph-Technik eine qualitative Bewertung der Fluidströmungsperiodizität um die Blase ermöglicht. Die Durchführung von Experimenten in einer Druckkammer unter Überdruck-Bedingungen bildet eine neuartige Methode, um solche Experimente unter höheren Temperaturgradienten durchzuführen und höhere Marangoni-Zahlen zu erreichen. Die thermokapillare Blasenkonvektion wurde in dieser Arbeit in laminaren stetigen Flüssigkeitsströmungen, periodischen und nichtperiodischen oszillierenden Flüssigkeitsströmungen eingeteilt. Die periodischen Fluidströmungsschwingungen wurden in Abhängigkeit von unterschiedlichen Randbedingungen in symmetrische und asymmetrische eingeteilt. Die nichtperiodischen Strömungsoszillationen um die Gasblase wurden auch bei hohen Temperaturgradienten für verschiedene Blasenaspektverhältnisse erreicht. Wir konnten zeigen, dass für jede Blasengröße der nichtperiodische Schwingungszustand der Strömung um die Gasblase vier verschiedene Modi (A-D) besitzen kann. Die letzte (Phase D) ist ein hoch entwickelter turbulenter Zustand, der bei Mg-Zahlen von 75000 für das kleinste Blasenaspektverhältnis von 1,2 bis zur maximal gemessenen Mg-Zahl von 140000 für das Blasenaspektverhältnis von 2,3 beginnt. Der ausgebildete turbulente Zustand der thermokapillaren Strömung konnte mit unserer experimentellen Konfiguration erstmalig erreicht werden. Darüber hinaus konnten die Antriebsgeschwindigkeiten der thermokapillaren Strömung an der Peripherie der Blase bei verschiedenen Randbedingungen gemessen werden. Diese Studie zeigt deutlich, dass es die Höhe der Antriebsgeschwindigkeit ist, welche die Wechselwirkungen zwischen thermokapillaren Strömungswirbeln unterschiedlicher Größe antreibt, die schließlich zu chaotischen Schwingungen der im Folgenden beschriebenen Grenzlinie führen. Diese Studie zeigt auch, dass die Auftriebskonvektion in der beschriebenen Strömungskonfiguration eine untergeordnete Rolle spielt.:1 INTRODUCTION 2 LITERATURE REVIEW 3 EXPERIMENTAL SETUP AND METHODOLOGY 4 RESULTS AND DISCUSSION 5 CONCLUSIONS AND RECOMMENDATIONS
McCallum, Marcus Anthony. "The simulation of wet steam flow in a turbine." Thesis, University of Strathclyde, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366697.
Повний текст джерелаCao, Yang. "STUDY ON BUBBLE BEHAVIORS IN SUBCOOLED FLOW BOILING." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215532.
Повний текст джерелаCowling, Neil Peter. "Thin film flow over a topography and non-isothermal droplets : a numerical study." Thesis, University of Leeds, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.551241.
Повний текст джерелаBeussman, Kevin Michael. "The Dynamics of Viscous Droplets near Micro-Patterned Solid Surfaces in Creeping Flow." Thesis, North Dakota State University, 2014. https://hdl.handle.net/10365/27322.
Повний текст джерелаDrumright-Clarke, Mary Ann. "Numerical simulations that characterize the effects of surfactant on droplets in shear flow." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/26895.
Повний текст джерелаPh. D.
Zhao, Sicheng. "Interactive dynamics of fluid flow and metallic alloys solidification." Thesis, Aix-Marseille 3, 2011. http://www.theses.fr/2011AIX30010.
Повний текст джерелаWe studied the convective phenomena and their dynamical interaction with the formation of the microstructurs during directional solidification of binary metallic alloys.The post-mortem method was used first to study the Columnar-Equiaxed-Transition during the directional solidification of unrefined Al-3.5wt%Ni in cylindric samples under the Accelerated Crucible Rotation Technique. The numerical imulation was carried out and achieved the results in agreement with experiments.The in-situ technique was applied to understand the evolution of equiaxed grains during solidification of Al-4wt%Cu in function of time. The statistical characteristics of equiaxed grains were discussed.The buoyancy-driven and surface-tension-driven instability convection under vertical and horizontal thermal gradients in a liquid-porous double-layered system were respectively investigated through linear instability analysis.The inhomogeneity of the dendritic mush permeability was taken into account in order to understand its influence on the triggering of convection during the directional solidification of Al-3.5wt%Li
Faletra, Melissa Kathleen. "Segregation of Particles of Variable Size and Density in Falling Suspension Droplets." ScholarWorks @ UVM, 2014. http://scholarworks.uvm.edu/graddis/265.
Повний текст джерелаMikkelsen, Alexander. "Experimental Studies of Flow- and Electric Properties of Oil Droplets Including Suspended Clay Particles." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-16798.
Повний текст джерелаWANG, AIHUA. "EFFECTS OF FREE SURFACE HEAT TRANSFER AND SHAPE ON THERMOCAPILLARY FLOW OF HIGH PANDTL NUMBER FLUIDS." Case Western Reserve University School of Graduate Studies / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=case1094682055.
Повний текст джерелаUlrichs, Enno Sebastian. "Experimental investigations into the behavior and influence of water droplets in a compressor cascade flow." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=985090871.
Повний текст джерелаSelvi, İlker Doymaz Fuat. "Modeling of collection of non-spherical particle assemblies by liquid droplets under potential flow conditions/." [s.l.]: [s.n.], 2006. http://library.iyte.edu.tr/tezler/master/kimyamuh/T000553.pdf.
Повний текст джерелаHuo, Yunlong. "Finite element modeling of internal flow and stability of droplets levitated in electric and magnetic fields." Online access for everyone, 2005. http://www.dissertations.wsu.edu/Dissertations/Summer2005/y%5Fhuo%5F083005.pdf.
Повний текст джерелаLim, Bryan Neo Beng. "Computational simulations of fuel/air mixture flow in the intake port of a SI engine." Thesis, University of Sheffield, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310769.
Повний текст джерелаVantzos, Orestis. "Mathematical Modeling of Charged Liquid Droplets: Numerical Simulation and Stability Analysis." Thesis, University of North Texas, 2006. https://digital.library.unt.edu/ark:/67531/metadc5240/.
Повний текст джерелаWan, Man Pun. "Indoor transport of human expiratory droplets in association with airborne infectious disease transmission using a multiphase-flow approach /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?MECH%202006%20WAN.
Повний текст джерелаMalik, Jennifer E. "Using Computational Modeling Techniques to Identify and Target Viable Drug Delivery Protocols to Treat Chronic Otitis Media." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1534780839820268.
Повний текст джерелаMullins, Benjamin James, and n/a. "Study of Capture, Fibre Wetting and Flow Processes in Wet Filtration and Liquid Aerosol Filtration." Griffith University. School of Environmental Engineering, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040919.124658.
Повний текст джерелаMullins, Benjamin James. "Study of Capture, Fibre Wetting and Flow Processes in Wet Filtration and Liquid Aerosol Filtration." Thesis, Griffith University, 2004. http://hdl.handle.net/10072/365591.
Повний текст джерелаThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Environmental Engineering
Faculty of Environmental Sciences
Full Text
Cai, Yangjun. "Simple Alternative Patterning Techniques for Selective Protein Adsorption." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1257386752.
Повний текст джерелаMalý, Milan. "Internal Flow of Spill-Return Pressure-Swirl Atomizers." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-437981.
Повний текст джерелаTadrous, Ebram [Verfasser], Günter [Akademischer Betreuer] Wozniak, Günter [Gutachter] Wozniak, and Janusz A. [Gutachter] Szymczyk. "Experimental investigation of the transition of Marangoni convection around a stationary gas bubble towards turbulent flow / Ebram Tadrous ; Gutachter: Günter Wozniak, Janusz A. Szymczyk ; Betreuer: Günter Wozniak." Chemnitz : Universitätsverlag Chemnitz, 2021. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa2-749938.
Повний текст джерелаJauseau, Nicolas. "Multiphase Flow Effects on Naphthenic Acid Corrosion of Carbon Steel." Ohio University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1354149810.
Повний текст джерелаShen, Huanhuan. "Interferometric out-of-focus imaging and digital holography for the characterization of droplets or bubbles : theory, optical design, characterization of a flow, synchronized experiments." Rouen, 2014. http://www.theses.fr/2014ROUES015.
Повний текст джерелаAn original simulator of Interferometric Laser Imaging for Droplet Sizing (ILIDS), allowing predicting the image patterns obtained by any imaging system, is developed. The formalism of the simulator relies on the generalized Huygens-Fresnel integral. The initial field scattered by the droplet is simplified by two glare points. An original ILIDS system is designed due to the simulator. The advantage of this configuration is that the three dimensional locations and sizes of droplets can be obtained simultaneously. The cylindrical ILIDS configuration includes a supplemental cylindrical lens rotated in a proper angle with respect to the axis of imaging system. The anamorphic configuration allows to change the orientation of the fringes and the form of the out-of-focus image with respect to the axial location of the particle. Three experiments are successively conducted: water droplets in air, bubbles in water at cubic aquarium and bubbles in glycerin at cylindrical channel. The comparisons of the simulations and experiments show good consistence. The precisions of the axial location and diameter obtained by cylindrical ILIDS technique are evaluated experimentally. The axial locations obtained by cylindrical ILIDS configuration are validated by comparing them with calibrated values, while the diameters are validated due a synchronized experiment coupling Digital In-Line Holography technique and cylindrical ILIDS technique
Lee, Yousub. "Simulation of Laser Additive Manufacturing and its Applications." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1440360229.
Повний текст джерелаQin, Tongran. "Buoyancy-thermocapillary convection of volatile fluids in confined and sealed geometries." Diss., Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/54939.
Повний текст джерелаMaquet, Jean. "Contribution à l'étude des mécanismes de surstabilité d'une surface libre chauffée par un laser ou un fil chaud." Rouen, 1987. http://www.theses.fr/1987ROUES047.
Повний текст джерелаHennessy, Matthew Gregory. "Mathematical problems relating to the fabrication of organic photovoltaic devices." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:7753abec-bb6e-4d8a-aa5b-b527c5beb49b.
Повний текст джерелаBelkhelfa, Yazid. "Etude du comportement dynamique et du transfert de matière et de chaleur entre des particules sphériques et un écoulement laminaire ou turbulent." Phd thesis, INSA de Rouen, 2008. http://tel.archives-ouvertes.fr/tel-00560879.
Повний текст джерелаDegonville, Maximilien. "Etude numérique de la dynamique sous écoulement de gouttes et vésicules avec viscosités de surface." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0751/document.
Повний текст джерелаThere are many fluid systems in the biology, food industry, pharmacology or cosmestics fields that are bound by an interface which mechanical properties rule the system stability. Objects like droplets, vesicles or polymersomes change their shape in a simple flow which lead to a wealth of space and time dynamics. These properties are controlled by the nature of the interface material. The aim of this work is the numerical study of the deformation of droplets, vesicles and polymersomes in a Stokes flow, especially when the interfacial viscosities play an important role. A numerical computation code coupling boundary integrals and finite elements was used to describe the interfacial physics of these objects and study their behaviour when immerged in a flow. Multiple resolution strategies where developped to this end in order to optimize the numerical computation in the cas of an interface with viscosities.Using this work, the influence of interfacial viscosities on the dynamics of a droplet in an extensional flow is studied : in particular, their influence on the stretching dynamics of a droplet and its break up conditions was characterized. The study of a vesicle, droplet bounded by a lipid bilayer, strongly deflated and immerged in a shear flow detailed the bifurcation between two shape types existing for this system. These shapes have an influence on the vesicle dynamics under flow, which is studied for an unbounded flow and a near-wall flow. Finally, we show first results about the dynamics of a polymersome in a shear flow. We used them to build a phase diagram for the behaviour of this object depending on the membrane viscosity and the shear rate
Bruyat, Anne. "Influence de l'évaporation de gouttes multicomposant sur la combustion et des effets diphasiques sur l'allumage d'un foyer aéronautique." Thesis, Toulouse, ISAE, 2012. http://www.theses.fr/2012ESAE0041/document.
Повний текст джерелаThe design of new aircraft engines needs in particular to comply with safety standards for the performance of stabilized combustion and ignition or re-ignition under critical conditions. Experimental campaigns are expensive, so numerical tools are needed. To improve the accuracy of the models used to simulate flow, the multicomponent nature of the fuel must be taken into account, whether it is kerosene or alternative fuel. The objective of this thesis is to study the influence of a droplet mist vaporization on a reactive flow. For this, an academic study of the propagation of a 1D laminar flame is performed using a CFD code {CEDRE). A continuous stream of monodisperse droplets is injected, the droplets being mono or bicomponent. The influence of the dynamics of evaporation on combustion is particularly studied. Two reduced multicomponent chemical kinetics are compared. The composition, the diameter and the initial equivalent ratio of droplets have an impact on the structure of the flame, the flame speed and composition of the burnt gases. A local ignition kernel model is applied to study the influence ofvaporization on ignition in the case of monocomponent, polydisperse droplets. Experimental data are available for a monosector combustion chamber (MERCATO) so the non-reactive unsteady flow is simulated with a LES approach. The unsteady, sometimes periodic, nature of the dispersed phase is highlighted in some points of the flow. A ignition model is applied to instantaneous flow fields and criteria are analysed to realise an ignition probability map which validates the approach. Finally, ignition of a combustion chamber is tested. The results point out an overestimation of source terms related to the evaporation of the dispersed phase and combustion
Neiss, Coraline. "Modélisation et simulation de la dispersion turbulente et du dépôt de gouttes dans un canal horizontal." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENI093/document.
Повний текст джерелаDroplets dispersion and deposition in turbulent duct flows are important processes, occurring in numerous environmental and industrial applications. This work is devoted to the study of gas-droplets flows and, more particularly, the objective is to improve the droplets deposition modeling in horizontal flows. Droplets are supposed to be smaller than the Kolmogorov scale, with a density large compared to the density of the gas phase. Under these assumptions, the motion of a droplet is considered to be governed by the drag force, the buoyancy force, and the gravity. Dilute incompressible and isothermal gas-droplets flows are studied, so inter-particle collisions are neglected but two-way coupling is retained, which means that modulation of turbulence by the particles is accounted for. In horizontal flow, droplets reach the wall under the actions of the gravitational settling and the turbulent diffusion. Two approaches will be used in developing this deposition physics with a first study at the 3D local scale and a second one at the 1D scale, realized for an industrial need. For each case, a model is developed for the mean deposition velocity of the droplets, with is implemented in a numerical simulation tool and then validated by comparison to experimental data. The local deposition model is established under the assumptions that the liquid film is extremely thin and perfectly absorbing and is implemented in the Neptune_CFD code. The experience carried out by Namie & Ueda, which consist in small droplets deposition from a turbulent dispersed flow in a horizontal rectangular duct, is simulated. An analysis of the interphase transfer terms in the kinetic energy equations shows the interactions between the dispersed phase and the continuous one and the impact of these phenomena on the turbulence of the gas phase is pointed out. The 1D deposition model is developed for the CATHARE-3 code and experimental data from the REGARD facility of the CEA Grenoble are used for validation