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Dissertations / Theses on the topic 'Shear flow'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Lemée, Thomas. "Shear-flow instabilities in closed flow." Thesis, Paris 11, 2013. http://www.theses.fr/2013PA112038.

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Cette étude se concentre sur la compréhension de la physique des instabilités dans différents écoulements de cisaillement, particulièrement la cavité entraînée et la cavité thermocapillaire, où l'écoulement d'un fluide incompressible est assuré soit par le mouvement d’une ou plusieurs parois, soit par des contraintes d’origine thermique.Un code spectral a été validé sur le cas très étudié de la cavité entrainée par une paroi mobile. Il est démontré dans ce cas que l'écoulement transit d'un régime stationnaire à un instationnaire au-delà d'une valeur critique du nombre de Reynolds. Ce travail e

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2

Marcos, Ph D. Massachusetts Institute of Technology. "Bacteria in shear flow." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65278.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 68-74).<br>Bacteria are ubiquitous and play a critical role in many contexts. Their environment is nearly always dynamic due to the prevalence of fluid flow: creeping flow in soil, highly sheared flow in bodily conduits, and turbulent flow in rivers, streams, lakes, and oceans, as well as anthropogenic habitats such as bioreactors, heat exchangers and water supply systems. The presence of flow not only affects how bac

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3

Rychkov, Igor. "Block copolymers under shear flow." 京都大学 (Kyoto University), 2004. http://hdl.handle.net/2433/145457.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(理学)<br>甲第11046号<br>理博第2824号<br>新制||理||1421(附属図書館)<br>22578<br>UT51-2004-J718<br>京都大学大学院理学研究科物理学・宇宙物理学専攻<br>(主査)教授吉川研一, 教授小貫明, 助教授瀬戸秀紀<br>学位規則第4条第1項該当

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4

Yato, Hiroki. "Flow pattern transition in curvilinear shear flows of viscoelastic fluids." 京都大学 (Kyoto University), 2010. http://hdl.handle.net/2433/131910.

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5

Miller, Joel C. "Shear flow instabilities in viscoelastic fluids." Thesis, University of Cambridge, 2006. https://www.repository.cam.ac.uk/handle/1810/245318.

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This dissertation is concerned with the theoretical study of the stability of viscoelastic shear flows. It is divided into two parts: part I studies inertialess coextrusion flows at large Weissenberg number where the instabilities are due to discontinuities in the elastic properties, and part II studies the effect of elasticity on the well-known inertial instabilities of inviscid flows with inflection points. We begin part I with a previously known short-wave instability of Upper Convected Maxwell and Oldroyd–B fluids at zero Reynolds number in Couette flow. We show that if the Weissenberg num

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6

Paraschiv, Ioana. "Shear flow stabilization of Z-pinches." abstract and full text PDF (free order & download UNR users only), 2007. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3264527.

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7

Wilson, Helen Jane. "Shear flow instabilities in viscoelastic fluids." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.625082.

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The dissertation is concerned with the stability of channel flows of viscoelastic fluids. The content is primarily theoretical. The dissertation begins with a review of instabilities observed in experiments and then attempts to elucidate possible mechanisms using linear stability theory. The first section considers a previously known interfacial instability in coextrusion flows, whose mechanism is purely elastic. This instability is investigated in different parameter régimes for an Oldroyd-B fluid. The next section generalises the study to a continuously stratified fluid, and finds that a cl

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8

Ogino, Yoshiko. "Crystallization of Polymers under Shear Flow." 京都大学 (Kyoto University), 2006. http://hdl.handle.net/2433/77789.

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9

Guvenen, Haldun. "Aerodynamics of bodies in shear flow." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184917.

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This dissertation investigates spanwise periodic shear flow past two-dimensional bodies. The flow is assumed to be inviscid and incompressible. Using singular perturbation techniques, the solution is developed for ε = L/ℓ ≪ 1, where L represents body cross-sectional size, and ℓ the period of the oncoming flow U(z). The singular perturbation analysis involves three regions: the inner, wake and outer regions. The leading order solutions are developed in all regions, and in the inner region higher order terms are obtained. In the inner region near the body, the primary flow (U₀, V₀, P₀) correspon

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10

Carter, Katherine Anne. "Shear banding in polymeric fluids under large amplitude oscillatory shear flow." Thesis, Durham University, 2016. http://etheses.dur.ac.uk/11746/.

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In this thesis, I theoretically explore shear banding of entangled linear polymer solutions and melts in large amplitude oscillatory shear strain (LAOStrain) and stress (LAOStress) protocols. This work moves beyond that of Moorcroft and Fielding [2013, 2014] who showed time-dependent shear banding in shear startup and step stress protocols. These protocols are only transiently time-dependent. LAOStrain and LAOStress have a sustained time-dependence. I consider the criteria derived in [Moorcroft and Fielding 2013] to predict the onset of shear banding in the transient material response for shea

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11

Voronkov, Igor. "Shear Alfvén waves and shear flow instabilities in the Earth's magnetosphere." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0003/NQ34851.pdf.

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12

Boulay, Fabienne. "Suspension-flow modeling : curvilinear flows and normal stress differences." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/11689.

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13

Sadrizadeh, Sasan. "Instabilities in Pulsating Pipe Flow of Shear-Thinning and Shear-Thickening Fluids." Thesis, Linköpings universitet, Mekanisk värmeteori och strömningslära, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-82037.

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In this study, we have considered the modal and non-modal stability of fluids with shear-dependent viscosity flowing in a rigid straight pipe. A second order finite-difference code is used for the simulation of pipe flow in the cylindrical coordinate system. The Carreau-Yasuda model where the rheological parameters vary in the range of 0.3 < n < 1.5 and 0.1 < λ < 100 is represents the viscosity of shear- thinning and shear thickening fluids. Variation of the periodic pulsatile forcing is obtained via the ratio Kω/Kο and set between 0.2 and 20. Zero and non-zero streamwise wavenumbe

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14

La, Vecchia Miriam. "Bacterial chemotaxis in non-homogeneous shear flow." Thesis, KTH, Mekanik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-36075.

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15

Babarutsi, Sofia. "Modelling quasi-two-dimensional turbulent shear flow." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=70223.

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A two-length-scale turbulence model is introduced in this thesis for the computation of quasi-two-dimensional turbulent shear flow with two distinct length scales of motion. In the model, the turbulence motions of the two distinct length scales are computed separately. The small-scale turbulence is treated as a background component locally in equilibrium while the large-scale turbulence is simulated using a second-order closure procedure. The development of the turbulent shear flows depends on the rate of energy transfer from the large-scale to the small-scale turbulence. Two mechanisms are id

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16

Feng, Yanhua. "Stably stratified shear flow over complex terrain." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264359.

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17

Terry, Ann Elizabeth. "Shear flow studies of liquid crystalline polymers." Thesis, University of Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390373.

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18

Gipon, Matthew. "Shear flow instabilities in pipes and channels." Thesis, Imperial College London, 2018. http://hdl.handle.net/10044/1/60643.

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Two broad problems are considered in this thesis. The first investigation focuses on the spatial stability of pressure driven flow in a pipe, while the second problem is concerned with temporal stability of Couette flow in a parallel wall channel. A similar approach is taken with both halves of this thesis: an asymptotic analytical model is developed and this is then solved with numerical methods. The prominent problem in the first chapter is Hagen-Poiseuille flow with suction and injection on the pipe wall boundary. The flow is fully developed in the axial direction and the suction acts radia

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19

Günther, Katrin, Kristin Laube, and Michael Mertig. "Shear-flow mediated changes in DNA morphology." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-191757.

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20

Alathur, Srinivasan Prem Anand. "Deep Learning models for turbulent shear flow." Thesis, KTH, Numerisk analys, NA, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-229416.

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Deep neural networks trained with spatio-temporal evolution of a dynamical system may be regarded as an empirical alternative to conventional models using differential equations. In this thesis, such deep learning models are constructed for the problem of turbulent shear flow. However, as a first step, this modeling is restricted to a simplified low-dimensional representation of turbulence physics. The training datasets for the neural networks are obtained from a 9-dimensional model using Fourier modes proposed by Moehlis, Faisst, and Eckhardt [29] for sinusoidal shear flow. These modes were a

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21

Günther, Katrin, Kristin Laube, and Michael Mertig. "Shear-flow mediated changes in DNA morphology." Diffusion fundamentals 11 (2009) 110, S. 1-2, 2009. https://ul.qucosa.de/id/qucosa%3A14084.

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22

Ames, Danielle 1974. "Shear flow visualization at high Reynolds Numbers." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50478.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1998.<br>Includes bibliographical references (leaves 92-94).<br>The mechanisms responsible for various disturbances in the wakes of ships have been investigated for some time. Efforts to define and characterize the contributing factors and resulting turbulent wake manifestations conclude that ship length, speed and geometry play integral and interdependent roles. Previous experimentation in the Ocean Engineering Towing Tank at MIT on small scale model ships supplied data for Reynold's Numbers up to ~ 0(106). The

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23

Topayev, Sultan. "Taylor-Couette flow for shear-thinning fluids." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0301.

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On s’intéresse aux instabilités secondaires dans un écoulement de Taylor-Couette en grand entrefer pour un fluide rhéofluidifiant. Des études théorique, expérimentale et numérique ont été mises en œuvre. D’un point de vue théorique, une analyse faiblement non linéaire a été développée en régime dit TVF (Taylor Vortex Flow) pour rendre compte des premiers effets de la non linéarité de la loi de comportement sur la structure de l’écoulement. Le comportement rhéologique du fluide est décrit par le modèle de Carreau. Des effets significatifs du caractère rhéofluidifiant ont été mis en évidence : L

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24

Abramson, Philip S. "Fluidic control of aerodynamic forces and moments on an axisymmetric body." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31707.

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Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2010.<br>Committee Chair: Ari Glezer; Committee Member: Bojan Vukasinovic; Committee Member: Mark Costello. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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25

Lindgren, Björn. "Flow facility design and experimental studies of wall-bounded turbulent shear-flows." Doctoral thesis, KTH, Mechanics, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3454.

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<p>The presen present thesis spans a range of topics within thearea of turbulent flows, ranging from design of flow facilitiesto evaluation aluation of scaling laws and turbulence modelingdeling aspects through use of experimental data. A newwind-tunnel has been designed, constructed and evaluated at theDept. of Mechanics, KTH. Special attention was directed to thedesign of turning vanes that not only turn the flow but alsoallow for a large expansion without separation in the corners.The investigation of the flow quality confirmed that theconcept of expanding corners is feasible and may besucc

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26

Lindsay, R. I. "Shear in nematic liquid crystal layers." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296747.

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27

Heitmann, Stefan. "Large eddy simulations of oceanic convective shear flow." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968893325.

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28

Vassileva, Nikolina Dimitrova. "Behavior of two-dimensional aggregates in shear flow." Enschede : University of Twente [Host], 2006. http://doc.utwente.nl/58360.

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29

Phillips, Christopher George. "Transport in biological tissue and in shear flow." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.257212.

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30

Hodgkinson, Richard. "The effect of extensional flow on shear viscosity." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/18327/.

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Shear rheology is conventionally studied under pure shearing flows, rather than more realistic mixed flows. Moving parallel surfaces and capillary rheometery are examples of the former, whilst the latter occurs whenever a flow accelerates or decelerates creating an additional component of extension, e.g. on passing through an industrial extrusion die. We postulate and gather supporting evidence that shear rheology is a function of not only shear, but both shear and extension rate, a factor with important consequences for fibre spinning and extrusion operations. The direction, as well as rate,

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31

Alaei, Kakhki Hossein. "Flow of shear-thinning fluids in geological media." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.

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As the primary conduits for water, oil, and geothermal resources, fractures and fracture flow are important in a wide range of applications, including water reservoir development, subsurface contamination, and petroleum and geothermal reservoir exploitation. Fracture flow estimations are subject to significant uncertainty and the role of rheology when the fluid is non-Newtonian makes the task considerably more difficult. In such a complex phenomenon, simple models allow us to qualitatively assess the effect of rheological and geometric characteristics on the flow. This study aims to investigat

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32

Pinilla, Camilo Ernesto. "Numerical simulation of shear instability in shallow shear flows." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115697.

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The instabilities of shallow shear flows are analyzed to study exchanges processes across shear flows in inland and coastal waters, coastal and ocean currents, and winds across the thermal-and-moisture fronts. These shear flows observed in nature are driven by gravity and governed by the shallow water equations (SWE). A highly accurate, and robust, computational scheme has been developed to solve these SWE. Time integration of the SWE was carried out using the fourth-order Runge-Kutta scheme. A third-order upwind bias finite difference approximation known as QUICK (Quadratic Upstream Interpola

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33

Hellum, Aren. "Intermittency and the viscous superlayer in a single stream shear layer." Diss., Connect to online resource - MSU authorized users, 2006.

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34

Weldon, Matthew J. (Matthew Jacob). "Experimental studies of shear stress and flow separation in low Reynolds number flows." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/39892.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.<br>Includes bibliographical references (p. 77-78).<br>Presented here is an experimental investigation of the kinematic theory of separation in unsteady two-dimensional flows, and an evaluation of a novel optical shear stress sensor. Fixed separation in the rotor-oscillator flow is studied for steady, periodic, and quasi-periodic fluid motion. Experimental results are directly compared to numerical simulations, which provide the shear-stress and pressure data required for detecting fixed separation in a

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35

Al-Mulla, Adam. "Droplet coalescence in the shear flow of model emulsions." Morgantown, W. Va. : [West Virginia University Libraries], 1998. http://etd.wvu.edu/templates/showETD.cfm?recnum=384.

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Thesis (M.S.)--West Virginia University, 1998.<br>Title from document title page. Document formatted into pages; contains xxi, 153 p. : ill. Includes abstract. Includes bibliographical references (p. 68-72).

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36

Flannery, Conor James. "Thrombus Formation under High Shear in Arterial Stenotic Flow." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6943.

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Acute thrombotic and thromboembolic occlusion of atherosclerotic vessels are events that precipitate most heart attacks and strokes. In arterial stenotic flow, thrombus formation is shear dependent and may or may not lead to complete occlusion of the vessel. Platelets in whole blood adhere to collagen-coated surfaces and as they accumulate the resistance of the stenosis increases because of the decreasing passageway of the occluded stenosis. As a model of blood clotting in stenoses, porcine blood is heparinized and perfused over tubular glass test sections that are coated with collagen type

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37

Håkansson, Karl. "Orientation of elongated particles in shear and extensional flow." Licentiate thesis, KTH, Strömningsfysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-95282.

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Elongated particles in fluid flows are a big part of the world we are living in. Gaining knowledge on how particles behave in different fluid flows can potentially increase the efficiency of industrial processes and decrease the world's energy consumption as well as improve the properties of future materials. In this thesis, the orientation of elongated particles in two different flows are studied. The first case is a dilute fibre suspension in a turbulent flow and the second case is a semi-dilute fibril dispersion in a laminar flow. The fibres (cellulose acetate) are at least three orders of

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38

Brown, Nicholas J. "The effect of wall waviness on shear flow instabilities." Thesis, Imperial College London, 2007. http://hdl.handle.net/10044/1/1275.

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This thesis is concerned with the effect of wall waviness on shear flow instability, specifically for the incomprehensiblc flow in a channel. We investigate the stability of the flow in a channel with fixed wavy boundaries using two methods. Firstly the disturbance evolution is calculated using the parabolised stability equations (PSE), which apply to the flow stability at finite Reynolds number, and are solved using a finite-difference marching scheme, marching in the downstream direction. Secondly we employ the triple-deck formulation for channel flow which is valid at asymptotically high Re

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39

Wilkins, Georgina Mary Heather. "Characterisation of a lyotropic lamellar phase under shear flow." Thesis, University of Leeds, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426847.

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40

Krishnan, Anantha. "Numerical study of vorticity-combustion interactions in shear flow." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/14188.

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41

Cunha, Lucas Hildebrand Pires da. "Magnetic emulsions in shear flow under external magnetic fields." reponame:Repositório Institucional da UnB, 2018. http://repositorio.unb.br/handle/10482/33876.

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Dissertação (mestrado)—Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Mecânica, 2018.<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq).<br>Este trabalho analisa a resposta de uma gota plana de ferrofluido imersa em um líquido newtoniano não magnético à ação combinada de um campo magnético externo e um escoamento cisalhante simples permanente. Uma metodologia numérica baseada no Método de Projeção e no Método Level-Set é desenvolvida para resolver o campo magnético, as equações completas de Navier-Stokes contemplando forças capilares e magné

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42

Lyman, Noah J. "Incorporating Shear Resistance into Debris Flow Triggering Model Statistics." DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2254.

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Several regions of the Western United States utilize statistical binary classification models to predict and manage debris flow initiation probability after wildfires. As the occurrence of wildfires and large intensity rainfall events increase, so has the frequency in which development occurs in the steep and mountainous terrain where these events arise. This resulting intersection brings with it an increasing need to derive improved results from existing models, or develop new models, to reduce the economic and human impacts that debris flows may bring. Any development or change to these mode

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43

Bremner, Sherry. "A granular flow model of an annular shear cell." Doctoral thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/20304.

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Machinery such as an IsaMillTM used in communition to produce fine particle sizes that allow minerals to be extracted are best modelled using granular flows. A single rheological description that captures all the features of granular flows has not yet been realised, although considerable progress towards a complete theory has been made. Existing models of such horizontally stirred mills are empirical, tend to be extremely dependent on boundary conditions and do not allow for confident extrapolation beyond their window of design. As a first step to understanding the dynamics inside the IsaMill

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44

Su, Siling. "Shear and extensional flow study of polymer/particle dispersions." Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/4656/.

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45

Doty, Sherry D. "Fluid shear stress effects on fibronectin in endothelial cells." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/19073.

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46

Selomulya, Cordelia Chemical Engineering &amp Industrial Chemistry UNSW. "The Effect of Shear on Flocculation and Floc Size/Structure." Awarded by:University of New South Wales. Chemical Engineering and Industrial Chemistry, 2002. http://handle.unsw.edu.au/1959.4/18226.

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The effect of shear on the evolution of floc properties was investigated to analyse the flocculation mechanisms. Little fundamental attention has been given to the shear influence that often creates compact aggregates, while the floc characteristics might differ in other aggregating conditions. It is thus crucial to understand how flocs evolve to steady state, if their properties are to be 'tailored' to suit subsequent solids-liquid separation processes. In this work, flocculation of monodisperse latex particles of various sizes (60, 380, and 810 nm diameter) via electrolyte addition was carri

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47

Carneal, Jason Bradley. "Integration and Validation of Flow Image Quantification (Flow-IQ) System." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/35322.

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The first aim of this work was to integrate, validate, and document, a digital particle image quantification (Flow-IQ) software package developed in conjunction with and supported by Aeroprobe Corporation. The system is tailored towards experimental fluid mechanics applications. The second aim of this work was to test the performance of DPIV algorithms in wall shear flows, and to test the performance of several particle sizing algorithms for use in spray sizing and average diameter calculation. Several particle sizing algorithms which assume a circular particle profile were tested with DPIV

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48

Monokrousos, Antonios. "Optimisation and control of shear flows." Doctoral thesis, KTH, Stabilitet, Transition, Kontroll, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-33771.

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Transition to turbulence and flow control are studied by means of numerical simulations for different simple shear flows. Linear and non-linear optimisation methods using the Lagrange multiplier technique are employed. In the linear framework as objective function the standard disturbance kinetic energy is chosen and the constraints involve the linearised Navier–Stokes equations. We consider both the optimal initial condition leading to the largest disturbance energy growth at finite times and the optimal time-periodic forcing leading to the largest asymptotic response for the case of the flat

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49

Zhang, Xu. "A numerical and experimental study of a dynamic resonant shear stress sensor." Laramie, Wyo. : [University of Wyoming], 2006. http://proquest.umi.com/pqdweb?did=1221706921&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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50

Baker, William John Jr. "The effects of population doubling on the shear stress response of bovin aortic endothelial cells." Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/19600.

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