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Dissertations / Theses on the topic 'Hele-Shaw Cell'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Khalid, A. H. "Free boundary problems in a Hele-Shaw cell." Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1463159/.

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The motion of a free boundary separating two immiscible fluids in an unbounded Hele-Shaw cell is considered. In the one-phase problem, a viscous fluid is separated from an inviscid fluid by a simple closed boundary. Preliminaries for a complex variable technique are presented by which the one-phase problem can be solved explicitly via conformal mappings. The Schwarz function of the boundary plays a major role giving rise to the so called Schwarz function equation which governs the evolution of exact solutions. The Schwarz function approach is used to study the stability of a translating ellipt
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2

Lanre, Akinyemi B. "The Interface Dynamics in the Hele-Shaw Cell." Ohio University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1520530015535937.

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3

Gianotti, Daniel. "Fluid Drop Coalescence in a Hele-Shaw Cell." Scholarship @ Claremont, 2003. https://scholarship.claremont.edu/hmc_theses/147.

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A fluid drop in a Hele-Shaw cell moves due to surface tension driven potential flow. Using equations for the pressure and the Green’s function for the Laplace Equation, we can formulate an integral equation that determines the motion of the boundary of the drop. By discretizing the boundary contour and following the motion of boundary nodes, the time evolution of the drop can be determined from initial conditions. Results of a numerical simulation show the movement of a drop relaxing from coalescence and the motion of a drop undergoing electrowetting.
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4

Malaikah, Khalid R. "Laplacian Growth: Interfacial Evolution in a Hele-Shaw Cell." Ohio University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1367417377.

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5

Aniss, Saïd. "Instabilités convectives en cellules de Hele-Shaw." Vandoeuvre-les-Nancy, INPL, 1993. http://www.theses.fr/1993INPL076N.

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Ce mémoire est consacre aux instabilités convectives stationnaires, en cellules de Hele-Shaw, pour des fluides usuels en présence du champ de pesanteur et pour des ferrofluides en présence d'un champ magnétique. Dans le premier chapitre, nous donnons une définition générale des liquides magnétiques ainsi que leurs propriétés thermomagnétiques, ensuite nous présentons les équations générales gouvernant le mouvement de convection magnétique et gravitationnelle. Dans le second chapitre, nous faisons un rappel sur la théorie des systèmes dynamiques qui fournit les outils de base permettant d'abord
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6

Dallaston, Michael C. "Mathematical models of bubble evolution in a Hele-Shaw Cell." Thesis, Queensland University of Technology, 2013. https://eprints.qut.edu.au/63701/1/Michael_Dallaston_Thesis.pdf.

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This thesis concerns the mathematical model of moving fluid interfaces in a Hele-Shaw cell: an experimental device in which fluid flow is studied by sandwiching the fluid between two closely separated plates. Analytic and numerical methods are developed to gain new insights into interfacial stability and bubble evolution, and the influence of different boundary effects is examined. In particular, the properties of the velocity-dependent kinetic undercooling boundary condition are analysed, with regard to the selection of only discrete possible shapes of travelling fingers of fluid, the for
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7

Baig, Fakhir U. "Effects of interfacial reaction on oil displacement in a Hele-Shaw cell." Thesis, University of Ottawa (Canada), 1993. http://hdl.handle.net/10393/7666.

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An experimental study was conducted to examine the behaviour of reactive and non-reactive systems by displacement experiments of light paraffin oil/decane mixtures by water in a range of mobility ratios. Displacement experiments were performed in a Hele-Shaw cell, simulated a quarter of a reversed five-spot pattern. Displacement patterns produced by reactive and non-reactive systems were compared. It showed that the displacement patterns in the case of the reactive system were completely different from the non-reactive system. The recovery in the reactive system was always higher than in the n
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8

ESPINOZA, PEDRO JOSE TOBAR. "EXPERIMENTAL STUDY OF SWEEP EFFICIENCY OF VISCOPLASTIC FLUID IN HELE-SHAW CELL." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2016. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=27684@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>PROGRAMA DE EXCELENCIA ACADEMICA<br>Uma abordagem experimental foi utilizada para o estudo da eficiência de varredura de fluidos viscoplásticos na célula de Hele-Shaw , que representa um meio poroso com porosidade constante. A análise baseia-se em um fluido empurrando outro onde, pela razão de viscosidades acima do punto de referência , manifesta-se a instabilidade de Saffman-Taylor, que desencadeia em uma interface instável com divisões sucessivas conhecidas como viscous finge
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9

FONTANA, João Vitor Nogueira. "Non-newtonian fluids in a Hele-Shaw cell: a pattern formation study." reponame:Repositório Institucional da UFPE, 2014. https://repositorio.ufpe.br/handle/123456789/13861.

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Submitted by Fabio Sobreira Campos da Costa (fabio.sobreira@ufpe.br) on 2015-05-08T14:05:16Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) 1 Dissertação - João Vitor Nogueir.pdf: 7740367 bytes, checksum: e311056ecafb8741fc3538682907dcc1 (MD5)<br>Made available in DSpace on 2015-05-08T14:05:16Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) 1 Dissertação - João Vitor Nogueir.pdf: 7740367 bytes, checksum: e311056ecafb8741fc3538682907dcc1 (MD5) Previous issue date: 2014-01-30<br>A insta
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10

Reichert, Benjamin. "Dynamique d'une goutte 2D dans une cellule de Hele-Shaw." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLET028/document.

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La microfluidique à goutte a connu un essor remarquable ces dix dernières années. Pourtant, la dynamique de ces objets reste largement inexplorée et incomprise. En effet, une question aussi fondamentale que de prédire la vitesse d'une goutte poussée par une phase porteuse à vitesse imposée, est restée jusqu’à ce jour, sans réponse. Comprendre la dynamique d'une goutte suppose de caractériser les dissipations visqueuses (friction) au sein de la goutte et dans le film de lubrification. Ces dissipations visqueuses sont étroitement liées à la forme et aux propriétés physico-chimiques de l'interfac
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11

VARGES, PRISCILLA RIBEIRO. "LIQUID-LIQUID DISPLACEMENT FLOWS IN A HELE-SHAW CELL INCLUDING NON-NEWTONIAN EFFECTS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2010. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=16992@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>Estudou-se neste trabalho o deslocamento de fluidos em meios porosos utilizando células de Hele-Shaw. Especificamente, investigou-se experimentalmente o deslocamento de um fluido não newtoniano por um newtoniano em uma célula retangular de Hele-Shaw. A instabilidade de Saffman-Taylor ou viscous fingering é um fenômeno observado quando um fluido de menor viscosidade desloca um de maior viscosidade, e a célula de Hele-Shaw é uma ferramenta conveniente para a sua observação. Esse fenômeno é muito importante em diversas aplicações, c
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12

AZEVEDO, PATRICIA EMIDIO DE. "LIQUID-LIQUID DISPLACEMENT FLOWS IN A HELE-SHAW CELL INCLUDING NON-NEWTONIAN EFFECTS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2015. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=26868@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>A perfuração de poços de petróleo, principalmente em ambientes offshore, é uma operação que demanda um custo muito elevado, portanto a minimização de problemas e danos ao reservatório produtor é muito importante. O projeto de um fluido de perfuração que garanta a mínima invasão na rocha reservatório é um tópico fundamental, como consequência a indústria petrolífera tem investido em estudos com o intuito de evitar que este problema ocorra. Sendo assim, nesse trabalho estudou-se
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13

Alqatari, Samar(Samar Ali A. ). "Reduced-dimension model for the Rayleigh-Taylor instability in a Hele-Shaw cell." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/122316.

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Thesis: S.M., Massachusetts Institute of Technology, Computation for Design and Optimization Program, 2019<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 93-94).<br>In this thesis we present a reduced-dimension model for the density-driven hydrodynamic Rayleigh-Taylor instability. We motivate the project with experimental findings of a little-understood stabilizing effect of geometry and deviations of measured instability wavelength from theoretical predictions. We present novel methods of data analysis for the experimental data. We then present a reduce
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14

Al, Sarraf Elias. "Instabilités de flammes de prémélange en cellule de Hele-Shaw." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0590/document.

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La combustion pré mélangée a été depuis longtemps un domaine vaste d’étude au niveau appliqué et fondamental. Bien que la plupart des applications industrielles en combustion aient lieu dans des régimes turbulents, le passage par l’étude laminaire est indispensable pour comprendre les mécanismes fondamentaux des flammes turbulentes. Ce travail de thèse porte essentiellement sur l’étude des différentes instabilités agissant sur un front de flamme laminaire de pré mélange pour des mélanges de propane-air et méthane-air, enrichis ou non en azote. L’étude consiste à mesurer les taux de croissance
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15

Ye, Ji. "Global existence for bubbles in a Hele-Shaw cell with arbitrary nonzero surface tension." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1268414323.

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16

Jackson, Michael. "Interfacial instability analysis of viscous flows in a Hele-Shaw channel." Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/212417/1/Michael_Jackson_Thesis.pdf.

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When a less viscous fluid displaces a more viscous fluid inside a quasi-two-dimensional channel, the interface separating the two fluids can become highly unstable and perturbed. By assuming that the more viscous fluid is finite in volume, this thesis uses analytical and computational methods to investigate the effect of two fluid interfaces. The results could have implication in fields such as oil extraction, geology, and advanced manufacturing.
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17

Orji, Uzoma A. "Ferrofluid dynamics in a Hele-Shaw cell simultaneously stressed by DC and rotating magnetic fields." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/41666.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.<br>Includes bibliographical references (p. 81).<br>Earlier experiments have been repeated to evaluate magnetic fluid behavior in DC, AC and rotating magnetic fields. Understanding these behaviors are essential to the ferrohydrodynamic applications of ferrofluids in biomedicine. Careful measurements in Hele-Shaw cells with simultaneous perpendicular DC and in-plane rotating magnetic fields have shown that ferrofluid drop spiral patterns rotate in the same direction as the rotatin
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18

La, Flèche Maxime. "Dynamics of Blast Wave and Cellular H2-Air Flame Interaction in a Hele-Shaw Cell." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/38178.

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The present thesis investigates the interaction of a shock wave with a cellular flame and the ensuing mechanisms on the dynamics of the subsequent flame deformation. The inter- action is known to disrupt the flame surface through the Richtmyer-Meshkov instability, hence potentially enhancing the local combustion rates. This study aims to clarify the evolution of a flame when perturbed head-on by a shock wave. Two novel series of experiments were conducted in a vertically-oriented Hele-Shaw cell, which could successfully isolate a quasi-bidimensional cellular flame structure at ambient conditio
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19

Pumir, Alain. "Tourbillons à trois dimensions et interfaces dans les cellules de hele-shaw." Paris 6, 1987. http://www.theses.fr/1987PA066754.

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20

Trieu, Hung Truong. "Études théorique et expérimentale du transport de fluides miscibles en cellule Hele-Shaw." Thesis, Vandoeuvre-les-Nancy, INPL, 2011. http://www.theses.fr/2011INPL027N/document.

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Dans cette thèse, nous avons étudié expérimentalement, numériquement et théoriquement la sédimentation d’un soluté en cellule de Hele-Shaw, modèle analogue de milieu poreux, avec un écoulement zonal horizontal. Une cellule, alimentée par deux grands réservoirs assurant un écoulement zonal uniforme, a été réalisée au laboratoire. La vitesse a été mesurée par PIV. L’injection d’une solution saline dans cet écoulement permet de visualiser la propagation du panache de pollution, et de mesurer le champ de concentration par LIF. Trois configurations typiques ont été observées : panache sans digitati
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21

ANJOS, Pedro Henrique Amorim. "Efeitos de molhamento nas instabilidades hidrodinâmicas e em forças adesivas em fluidos confinados." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/18074.

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Submitted by Fabio Sobreira Campos da Costa (fabio.sobreira@ufpe.br) on 2016-12-12T14:44:32Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação - Pedro Henrique Amorim Anjos.pdf: 9970150 bytes, checksum: 29bca81f576fbdecd909c0ab24d68ce5 (MD5)<br>Made available in DSpace on 2016-12-12T14:44:32Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação - Pedro Henrique Amorim Anjos.pdf: 9970150 bytes, checksum: 29bca81f576fbdecd909c0ab24d68ce5 (MD5) Previous issue date: 2015-02-05<br
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22

Monnet, Benjamin. "Fluides newtoniens et suspensions : bulle unique et vidange." Electronic Thesis or Diss., Lyon, École normale supérieure, 2024. http://www.theses.fr/2024ENSL0014.

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Les écoulements multiphasiques (gaz/liquide/solide) sont présents dans de nombreux processus naturels et industriels. Malgré les nombreuses études sur ce sujet, sa physique riche et complexe soulève encore de nombreuses questions. Dans cette thèse, nous proposons de quantifier d'une part la remontée d'une bulle unique dans un milieu confiné et d'autre part, la vidange d'un réservoir. Dans les deux cas, nous étudierons et comparerons les fluides newtoniens et les suspensions. Tout d'abord, nous avons regardé la vitesse et la forme d'une bulle remontant à la verticale dans un liquide newtonien.
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23

Maes, RENAUD POL. "Etude expérimentale de la digitation visqueuse de fluides miscibles en cellule de Hele-Shaw." Doctoral thesis, Universite Libre de Bruxelles, 2010. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/216585.

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La digitation visqueuse est une instabilité hydrodynamique apparaissant lorsque, dans un milieu poreux, un fluide moins visqueux déplace un fluide plus visqueux. L'objectif de notre thèse est l'étude expérimentale des propriétés des motifs de digitation lorsque l'échantillon de fluide visqueux est de taille finie et lorsqu'une réaction chimique modifie la viscosité dans un milieu poreux modèle, en l'occurrence une cellule de Hele-Shaw. En particulier, notre étude a permis de quantifier la contribution de dispersion et de la digitation visqueuse, l'étalement dans l'espace d'échantillons de tail
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24

David, Noemi. "Asymptotic analysis for a model of tumor growth: from a cell density model to a Hele-Shaw problem." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/17066/.

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In questa tesi si presenta l'analisi asintotica di un modello di crescita tumorale, seguendo l'articolo The Hele–Shaw Asymptotics for Mechanical Models of Tumor Growth (2014) di Perthame B., Quiròs F. e Vàzquez J.L. Tramite l'analisi asintotica è possibile costruire una correlazione tra i due principali approcci utilizzati nella descrizione del fenomeno: modelli della densità cellulare e problemi a frontiera libera. I primi descrivono l'evoluzione della popolazione cellulare e la sua interazione con fattori esterni (ossigeno, glucosio, sostanze chimiche) attraverso sistemi di equazioni diffe
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25

Schafroth, Dario. "Influence of non monotonic viscosity profiles on the stability of miscible displacement flows in a Hele-Shaw cell." Zürich : ETH, Eidgenössische Technische Hochschule Zürich, Institut of Fluid Dynamics, 2006. http://e-collection.ethbib.ethz.ch/show?type=dipl&nr=232.

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26

Tsai, Tsung-hsun 1961. "Hydrodynamical instability of the mushy layer during directional solidification of ammonium chloride solution in a Hele-Shaw cell." Diss., The University of Arizona, 1996. http://hdl.handle.net/10150/282278.

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Experiments of directional solidification in a Hele-Shaw cell, 240 mm x 245 mm x 1 mm, were carried out to study the effects of convective flows and the evolution of structure in the "mushy layer", consisting of fluid and crystallites. Three different concentrations of ammonium chloride (NH₄Cl) solution, 26%, 27% and 28%, with a constant bottom cooling temperature ranging from 5°C to -20°C were used as an analogue model for metallic alloy systems. The experimental design included techniques using Peltier heat pumps along with PID feedback control for temperature regulation. A shadowgraphic vis
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27

Yildirim, Yakut. "Application Of Vapex (vapour Extraction) Process On Carbonate Reservoirs." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/3/1206366/index.pdf.

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The vapour extraction process, or &amp<br>#8216<br>VAPEX&amp<br>#8217<br>has attracted a great deal of attention in recent years as a new method of heavy oil or bitumen recovery. The VAPEX (vapour extraction) can be visualized as energy efficient recovery process for unlocking the potential of high viscosity resources trapped in bituminous and heavy oil reservoirs. A total of 20 VAPEX experiments performed with Hele-Shaw cell utilizing three different Turkish crude oils. Two different VAPEX solvents (propane and butane) were used with three different injection rates (20, 40 and 80 ml/min). Gar
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28

SILVA, Antônio Márcio Pereira. "Estudos sobre o modelo O(N) na rede quadrada e dinâmica de bolhas na célula de Hele-Shaw." Universidade Federal de Pernambuco, 2013. https://repositorio.ufpe.br/handle/123456789/17187.

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Submitted by Fabio Sobreira Campos da Costa (fabio.sobreira@ufpe.br) on 2016-06-29T13:52:59Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) tese_final.pdf: 5635071 bytes, checksum: b300efb627e9ece412ad5936ab67e8e2 (MD5)<br>Made available in DSpace on 2016-06-29T13:52:59Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) tese_final.pdf: 5635071 bytes, checksum: b300efb627e9ece412ad5936ab67e8e2 (MD5) Previous issue date: 2013-08-26<br>CNPq<br>No presente trabalho duas classes de problemas são ab
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29

Beauvier, Edouard. "Propagation d'un front de réaction-diffusion dans un écoulement cellulaire multi-échelle." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4728/document.

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La propagation d'un front de réaction-diffusion est étudiée expérimentalement dans un écoulement cellulaire multiéchelle. Le front est produit par réaction autocatalytique en solution. L'écoulement est réalisé en géométrie de Hele-Shaw par électroconvection, son caractère multiéchelle étant réalisé par l'action combinée de deux nappes d'aimants d'échelles différentes. La géométrie du front et sa vitesse moyenne de propagation sont déterminées pour une large gamme d'intensité des vortex de chaque échelle. Elles sont confortées par une simulation numérique de l'avancée du domaine brulé dans le d
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30

Kreyenberg, Philipp Johannes [Verfasser], and Kurt [Akademischer Betreuer] Roth. "Flow Field Estimation of Active Solute Transport – Information Transfer from Synthetic Data to Hele-Shaw Cell Experiments Using Convolutional Neural Networks / Philipp Johannes Kreyenberg ; Betreuer: Kurt Roth." Heidelberg : Universitätsbibliothek Heidelberg, 2019. http://d-nb.info/1200021592/34.

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31

Mainhagu, Jon. "Transport de fluides miscibles à propriétés physiques variables en cellule Hele-Shaw.Comparaisons entre simulations numériques et mesures par LIF." Thesis, Vandoeuvre-les-Nancy, INPL, 2009. http://www.theses.fr/2009INPL032N/document.

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L'étude décrite dans cette thèse porte sur l'injection ponctuelle d'une solution saline au sein d'une cellule dite de Hele-Shaw, afin de caractériser le comportement dispersif d'un polluant en milieu poreux. L'approche expérimentale employée est basée sur l'implémentation originale d'un dispositif de Fluorescence Induite par Laser (LIF) dans la cellule. La mise en place d'un protocole de mesure efficace permet de mener une analyse quantitative des résultats expérimentaux. En outre, en appliquant la méthode des moments, il est possible de caractériser avec précision le comportement dispersif de
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32

Ahoulou, Assohoun Wilfried. "Étude expérimentale du transport réactif en milieu poreux : application à la dissolution couplée à des gradients de masse volumique." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0172.

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Prédire les instabilités déclenchées par la réaction chimique d'un fluide percolateur traversant une roche soluble constitue un enjeu scientifique majeur pour de nombreux domaines d’application (formations des systèmes karstiques, évolution des fractures, stimulation acide des puits de pétrole ou encore la séquestration et le stockage du CO2). En effet, la dissolution de la matrice solide conduit souvent à l’apparition et au développement des canaux, appelés wormholes, qui modifient les caractéristiques hydrodynamiques (perméabilité et porosité) du milieu traversé. L’objectif de cette thèse es
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33

Rodriguez, Vincent. "Etude de la formation de jets issus de la dispersion d'un anneau de particules solides par onde de choc." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4750/document.

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La dispersion de particules par une onde de souffle ou de choc induit la formation de structures régulières qui prennent la forme de jets de particules. Jusqu'à présent, les expériences n'ont été réalisées qu'en trois dimensions rendant difficile l'exploitation des données. Dans cette étude, une onde de souffle, générée à l'extrémité d'un tube à choc, débouche au centre d'un anneau de particules solides initialement confiné dans une cellule de Hele-Shaw. Pour la première fois, à partir d'une expérience de laboratoire, la formation de jets de particules est observée dans une configuration quasi
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34

Grahn, Alexander. "Strömungsinstabilitäten bei Stoffübergang und chemischer Reaktion an der ebenen Grenzfläche zwischen zwei nicht mischbaren Flüssigkeiten." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-28755.

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In verfahrenstechnischen Anlagen der Flüssig-Flüssig-Stoffübertragung kommt es an der Phasengrenze zwischen den nicht mischbaren Flüssigphasen häufig zur Ausbildung hydrodynamischer Instabilitäten. Sie sind mit komplexen Geschwindigkeitsfeldern in den Flüssigphasen, insbesondere in den grenzschichtnahen Regionen verbunden und führen zu einem starken Anstieg der pro Zeiteinheit übertragenen Stoffmenge. Die Lösung der Diffusionsgleichung reicht in diesem Fall zur Vorausberechnung des für Auslegungszwecke bedeutsamen Stoffdurchgangskoeffizienten nicht mehr aus. Chemische Reaktionen stellen Quelle
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35

Grahn, Alexander. "Strömungsinstabilitäten bei Stoffübergang und chemischer Reaktion an der ebenen Grenzfläche zwischen zwei nicht mischbaren Flüssigkeiten." Forschungszentrum Rossendorf, 2005. https://hzdr.qucosa.de/id/qucosa%3A21702.

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In verfahrenstechnischen Anlagen der Flüssig-Flüssig-Stoffübertragung kommt es an der Phasengrenze zwischen den nicht mischbaren Flüssigphasen häufig zur Ausbildung hydrodynamischer Instabilitäten. Sie sind mit komplexen Geschwindigkeitsfeldern in den Flüssigphasen, insbesondere in den grenzschichtnahen Regionen verbunden und führen zu einem starken Anstieg der pro Zeiteinheit übertragenen Stoffmenge. Die Lösung der Diffusionsgleichung reicht in diesem Fall zur Vorausberechnung des für Auslegungszwecke bedeutsamen Stoffdurchgangskoeffizienten nicht mehr aus. Chemische Reaktionen stellen Quelle
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36

Zhang, Fengshou. "Pattern formation in fluid injection into dense granular media." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43716.

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Integrated theoretical and experimental analysis is carried out in this work to investigate the fundamental failure mechanisms and flow patterns involved in the process of fluid injection into dense granular media. The experimental work is conducted with aqueous glycerin solutions, utilizing a novel setup based on a Hele-Shaw cell filled with dense dry sand. The two dimensional nature of the setup allows direct visualization and imaging analysis of the real-time fluid and grain kinematics. The experimental results reveal that the fluid flow patterns show a transition from simple radial flow to
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37

Mostefai, Mohamed Sadek. "Déduction rigoureuse de l'équation de Reynolds à partir d'un système modélisant l'écoulement à faible épaisseur d'un fluide micropolaire, et étude de deux problèmes à frontière libre : Hele-Shaw généralisé et Stephan à deux phases pour un fluide non newtonien." Saint-Etienne, 1997. http://www.theses.fr/1997STET4019.

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Dans le chapitre 1, on considère le modèle micropolaire de Navier-Stokes avec conditions de bords de type Dirichlet non homogènes en dimension deux. On donnera un résultat d'existence d'une solution faible en utilisant le théorème du point fixe de Leray-Schauder, puis on prouvera l'unicité de la solution faible du problème sous certaines hypothèses. On établiera une justification mathématique de l’équation de Reynolds généralisé à partir de ce modèle là. On étudiera ensuite la forme de l'équation de Reynolds suivant le choix de la viscosité et des données initiales. Dans le chapitre 2, nous co
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38

Soriano, i. Fradera Jordi. "Roughness experiments of viscous fluid interfaces in disordered Hele-Shaw cells." Doctoral thesis, Universitat de Barcelona, 2003. http://hdl.handle.net/10803/669591.

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Se presenta un trabajo experimental sobre el crecimiento de interficies rugosas en medios desordenados. El experimento consiste en una celda de Hele-Shaw en cuya placa inferior se han distribuido una serie de obstáculos de cobre que hacen la función de desorden congelado. Un aceite de silicona es inyectado por uno de los extremos de la celda desplazando el aire inicialmente presente. El frente es estable por contraste de viscosidad pero se hace rugoso debido a la presencia del desorden. Los experimentos realizados se pueden clasificar en dos grupos principales según el tipo de mecanismo utiliz
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39

Eckert, Kerstin, Laurence Rongy, and Wit Anne De. "A + B → C reaction fronts in Hele-Shaw cells under modulated gravitational acceleration." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-139288.

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The dynamics of A + B → C reaction fronts is studied under modulated gravitational acceleration by means of a combination of parabolic flight experiments and numerical simulations. During modulated gravity the front position undergoes periodic modulation with an accelerated front propagation under hyper-gravity together with a slowing down under low gravity. The underlying reason for this is an amplification and a decay, respectively, of the buoyancy-driven double vortex associated with the front propagation under standard gravitational acceleration, as explained by reaction–diffusion–convecti
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40

Eckert, Kerstin, Laurence Rongy, and Wit Anne De. "A + B → C reaction fronts in Hele-Shaw cells under modulated gravitational acceleration." Royal Society of Chemistry, 2012. https://tud.qucosa.de/id/qucosa%3A27819.

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The dynamics of A + B → C reaction fronts is studied under modulated gravitational acceleration by means of a combination of parabolic flight experiments and numerical simulations. During modulated gravity the front position undergoes periodic modulation with an accelerated front propagation under hyper-gravity together with a slowing down under low gravity. The underlying reason for this is an amplification and a decay, respectively, of the buoyancy-driven double vortex associated with the front propagation under standard gravitational acceleration, as explained by reaction–diffusion–convecti
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41

Jackson, Samuel J. "A numerical study on the viscous fingering instability of immiscible displacement in Hele-Shaw cells." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/40716/.

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In this thesis, the viscous fingering instability of radial immiscible displacement is analysed numerically using novel mesh-reduction and interface tracking techniques. Using a reduced Hele-Shaw model for the depth averaged lateral flow, viscous fingering instabilities are explored in flow regimes typical of subsurface carbon sequestration involving supercritical CO2 - brine displacements, i.e. with high capillary numbers, low mobility ratios and inhomogeneous permeability/temperature fields. A high accuracy boundary element method (BEM) is implemented for the solution of homogeneous, finite
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42

Callens, Natacha. "Développement, étude expérimentale et visualisation par holographie digitale de mini-séparateurs fluidiques (STEP-SPLITT) en vue de la séparation d'objets de taille micrométrique." Doctoral thesis, Universite Libre de Bruxelles, 2005. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210976.

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Cette thèse expérimentale s’inscrit dans le domaine des sciences séparatives et se base sur la technique de SPLITT (SPLIT-flow Thin fractionation). Son objectif consiste en l’étude des mécanismes qui sont à l’origine de la séparation, en continu et sans membrane, d’objets de taille micrométrique dans des mini-séparateurs fluidiques (Step-SPLITT). Les expériences menées, en laboratoire et lors de vols paraboliques, ont révélé le couplage complexe comme l’influence des effets hydrodynamiques et du champ gravitationnel sur la migration transverse des espèces en écoulement. Des visualisations trid
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43

Ching, Jia-Hau, and 卿家豪. "Density-driven convection in Hele-Shaw cell." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/cmwh48.

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碩士<br>國立中央大學<br>物理學系<br>107<br>Inspired by the flow process of carbon capture and storage(CCS) technology in saline structure, we set up an analogy fluid system in homogeneous porous media to mimic the supercritical \ce{CO2} mixing dynamics with brine. Before getting into the details of the experiment, the theoretical background and previous works are presented first, and then the experimental setup of Hele-Shaw cell is shown. By observing the convective flow due to dissolution, the description of mixing dynamics is given. We also examine the coarsening process, onset time of convection, wavel
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44

Kaun, D. C., and 官大勤. "Labyrinthine Instabilities of Miscible Magnetic Fluids in a Hele-Shaw Cell." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/47657490678710678356.

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碩士<br>大葉大學<br>機械工程研究所碩士班<br>94<br>This thesis reports the The first completely experimental study on the labyrinthine instabilities at the miscible interface between dense magnetic fluids and less dense diesel oil. The liquids are confined in a Hele-Shaw cell and the magnetic fluid drop maintains a circular geometry initially. Labyrinthine fingering instabilities are trigger by the dipolar forces under an uniform perpendicular magnetic field. The influence of the magnetic field strength、drop diameter and gap width on the induced labyrinthine fingering instabilities are investigated. Two distin
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45

Huang, Chi-wen, and 黃琦雯. "Numerical Simulations of Radial Flows on a Rotating Hele-Shaw Cell." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/59925264052841313966.

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碩士<br>雲林科技大學<br>機械工程系碩士班<br>96<br>In this work, we have revisited the immiscible radial fingering problem in Hele-Shaw cells, now considering that the fluids are miscible. In addition to injection, the confined system can be subjected to rotation, so that centrifugal and Coriolis forces may affect the evolution of the diffusing interface in a nontrivial manner. This complex pattern formation problem is examined in detail through intensive numerical simulations. Our numerical experiments reveal that, when fingering is initiated between miscible fluids, the lack of surface tension at the moving
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46

Stovall, Idris Sadulla. "Numerical methods for Rayleigh -Benard convection inside a Hele -Shaw cell." 2001. https://scholarworks.umass.edu/dissertations/AAI3027263.

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Fluid dynamics inside a Hele-Shaw cell are investigated computationally. A Hele-Shaw cell is a rectangular chamber, filled with fluid, that consists of two closely placed parallel plates, i.e., it is very thin in one direction as compared with the other two. It effectively turns a three-dimensional situation into a “quasi” two-dimensional situation. Whenever a denser fluid is above a less dense fluid, a potentially unstable situation is created. For large enough density differences, convective motion occurs in the chamber. The fluid dynamics that result due to such an odd density arrangement i
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47

王蜀偉. "Interfacial Instabilities of a Miscible Droplet in a Hele-Shaw Cell." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/96523331737679747669.

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碩士<br>大葉大學<br>機械工程研究所<br>90<br>Numerical simulations of fingering stabilities in a miscible rotating Hele-Shaw flow in both the prewetted and dry situations by means of high accurate numerical schemes are presented. The interfacial instability is dominated by three control parameters, such as rotating speed, viscosity contrast, and diffusion between the species. Unstable mechanism is resulted from the centrifugal force if the heavier annulus, in general more viscous that provides stable viscous damping effect. The effect of stronger diffusion is not significant to the fingering patterns, but l
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48

Wang, Li Lin, and 王儷霖. "Miscible Droplet in a Hele-Shaw Cell and the Effects of Korteweg Stresses." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/26011529999127406453.

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碩士<br>大葉大學<br>機械工程研究所<br>89<br>Time-dependent numerical simulations of the motion of miscible droplets in homogeneous porous medium are presented. Both the influences of conventional flow parameters, such as the mobility ratios, dimensionless flow rates and droplet size (Peclet number) and dynamic Korteweg stresses are analyzed systematically. Vorticity-streamfunction formulation is applied to make the effects of velocity divergence caused by the concentration gradient implicitly in the governing equations. If the droplet is less viscous than the surrounding fluids, various fingering pattern
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49

HSIN-JUI, WU, and 吳欣叡. "Numerical simulation of Labyrinthine instabilities on miscible magnetic fluids in a Hele-Shaw cell." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/57621675108776401700.

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碩士<br>大葉大學<br>機械工程研究所碩士班<br>92<br>The labyrinthine fingering instabilities of miscible magnetic fluids on a Hele-Shaw cell are simulated high order numerically. Labyrinthine Fingering instabilities perturbed by the magnetic dipolar forces of under a uniform perpendicular magnetic field.Besides the influence of magnetic forces make miscible interfaces unstable, the interests in miscible interfaces also include the findings of the non-conventional stresses as like as surface-tensor in immsicible, or so-call Korteweg stresses, and great similarities of fingering patterns with the effects of inter
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50

楊紹甫. "Experimental study of Natural Convection of Magnetic Fluid in a Rectangular Hele-Shaw Cell." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/40420301798360091194.

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碩士<br>大葉大學<br>機械工程研究所<br>90<br>The nature convection of a magnetic fluid in a Hele-Shaw cell with aspect ratio of one was studied experimentally. The convection was induced by heating the cell at bottom. A vertical magnetic field opposite to the direction of gravity was also imposed. Results obtained from heat transfer measurements and shadowgraphs revealed that the vertically imposed magnetic field has destabizing influence. It enhanced the mature convection.
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