Rozprawy doktorskie na temat „Transport Phenomena Engineering Thermodynamics”
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Cardona, Claudia. "Uranium Sequestration by pH Manipulation using NH3 Injection in the Vadose Zone of Hanford Site 200 Area". FIU Digital Commons, 2017. http://digitalcommons.fiu.edu/etd/3352.
Pełny tekst źródłaRowane, Aaron J. "High-Temperature, High-Pressure Viscosities and Densities of Toluene". VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4188.
Pełny tekst źródłaSwartz, Melody A. "Interstitial-lymphatic transport phenomena". Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50376.
Pełny tekst źródłaDerivaux, Jean-Francois. "Stochastic thermodynamics of transport phenomena and reactive systems: an extended local equilibrium approach". Doctoral thesis, Universite Libre de Bruxelles, 2020. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/308809.
Pełny tekst źródłaOver the last decades, nanotechnology has experienced great steps forwards, opening new ways to manipulate micro- and nanosystems. These advances motivated the development of a thermodynamic theory for such systems, taking fully into account the unavoidable fluctuations appearing at that scale. This ultimately leads to an ensemble of experimental and theoretical results forming the emergent field of stochastic thermodynamics. In this thesis, we propose an original theoretical approach to stochastic thermodynamics, based on the extension of the local equilibrium hypothesis (LEH) to fluctuating variables in small systems. The approach provides new definitions of stochastic thermodynamic quantities, whose evolution is given by stochastic differential equations (SDEs).We applied this new formalism to a diverse range of systems: heat or mass diffusive transport, coupled transport phenomena (thermodiffusion), and linear or non-linear chemical systems. In each model, we used our theory to define key stochastic thermodynamic quantities. A great emphasis has been put on entropy and the different contributions to its evolution (entropy flux and entropy production) throughout this thesis. Other examples include also the stochastic Helmholtz energy, stochastic excess entropy production and stochastic efficiencies in coupled transport. We investigated how the statistical properties of these quantities are affected by external thermodynamic constraints and by the kinetics of the system. We first studied how the thermodynamic state of the system (equilibrium \textit{vs.} non-equilibrium) strongly impacts the distribution of entropy production. We then extended those findings to other related quantities, such as the Helmholtz free energy and excess entropy production. We also analysed how some external control parameters could lead to bimodality in stochastic efficiencies distributions.In addition, non-linearities affect stochastic thermodynamics quantities in different ways. Using the example of the Schlögl chemical model, we computed the average dissipation of the fluctuations in a non-linear system. Such systems can also undergo a bifurcation, and we studied how the moments and the distribution of entropy production change while crossing the critical point.All these properties were investigated with theoretical analyses and supported by numerical simulations of the SDEs describing the system. It allows us to show that properties of the evolution equations and external constraints could strongly reflect in the statistical properties of stochastic thermodynamic quantities.
Doctorat en Sciences
info:eu-repo/semantics/nonPublished
Hamilton, C. J. "Transport phenomena in hydrogel membranes". Thesis, Aston University, 1988. http://publications.aston.ac.uk/9719/.
Pełny tekst źródłaPowell, Adam Clayton IV. "Transport phenomena in electron beam melting and evaporation". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/39623.
Pełny tekst źródłaLuo, Xukun. "High pressure three-phase fluidization : hydrodynamics and transport phenomena /". The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487948440825092.
Pełny tekst źródłaSadomba, Clara P. (Clara Petronella). "A computational study of transport phenomena in RH-ladles". Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23377.
Pełny tekst źródłaThe flow field results were found to be in qualitative agreement with previously reported 3D numerical studies for similar systems. Due to the lack of any experimental or numerical results related to heat and/or mass transfer in RH-ladles, the heat and mass transfer results obtained in the present study could not be compared and verified.
Zhang, Hao. "Gravity-dependent transport phenomena in zeolite crystal growth". Case Western Reserve University School of Graduate Studies / OhioLINK, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=case1060021149.
Pełny tekst źródłaPongsaksawad, Wanida. "Numerical modeling of interface dynamics and transport phenomena in transport-limited electrolysis processes". Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/36209.
Pełny tekst źródłaThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 111-117).
Electrochemical reactions in materials and processes induce morphological instability on the cathode, which can lead to porous deposits or system failure. The growth of the protrusion is a complex phenomenon which involves chemical, electrical, and momentum driving forces in the system. Thus, it is important to understand the effect of electrochemistry in phase boundary evolution in order to optimize the performance of such processes. This thesis contributes to predicting and controlling such interface instability phenomena by developing a computational model that captures them. Successful application of the model to emerging metal extraction processes demonstrates its usefulness. A phase field model of electrochemical interface is developed for transport-limited electrolysis with rapid charge redistribution. This new Cahn-Hillard phase field formulation includes a model electrostatic free energy term, which captures the behavior of the diffuse interface under the applied electric field, in addition to transport by free energy gradient and convection. The model agrees with published stability criterion for a solid cathode. When the electrodes and electrolyte are low-viscosity fluids, flow stabilizes the interface.
(cont.) A new stability criterion for metal reduction in a liquid-liquid system is derived and agrees well with the model results. Next, the phase field model is extended for a ternary system to model titanium reduction in a supported electrolyte system. The model can simulate phase boundaries migration depending on the composition of the electrolyte and also electronically mediated reactions. Finally, Solid Oxide Membrane Electrolytic Smelting with Rotating Cathode (SOMERC), an emerging technology to electrolytically reduce titanium oxide from molten salt, is investigated. In the SOMERC process, rotational flow is introduced to create shear force that is expected to stabilize the interface. Computational fluid dynamics models of rotational flow are carried out to estimate the relationship between cathode rotational speed, shear strain rate, and boundary layer thicknesses. The phase field model presented in this thesis can be applied to any electrochemical reduction processes that are in the mass-transport controlled regime. Stability criteria and detailed morphology in two and three dimensions can be explored.
by Wanida Pongsaksawad.
Ph.D.
Holland, Emilie Charlotte. "Computational modelling of transport phenomena in cerebral aneurysms". Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:72471f90-9d97-4fbe-b2c3-499430678277.
Pełny tekst źródłaPearson, Natalie Clare. "Mathematical modelling of flow and transport phenomena in tissue engineering". Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:43688cc7-b523-4676-8c41-72db7fc07814.
Pełny tekst źródłaBegum, Latifa. "3-D transport phenomena in vertical direct chill casting processes". Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=121239.
Pełny tekst źródłaMaintenir l'uniformité de la distribution de température d'un métal liquide avant qu'il soit mis dans un moule de traitement thermique Direct Chill (DC) est critique pour réduire la formation de défauts. La température de la phase liquide d'un métal en fusion dépend sur sa configuration d'écoulement, et ce dernier est fortement liée aux particularités du distributeur de métal utilisé, ainsi qu'aux paramètres choisis pour l'alliage en question, tel que la vitesse de moulage, la fusion en surchauffe, la vitesse d'écoulement de l'eau de moule, etc. Si le système de distribution de température a des défauts de conception et ne peut pas réduire suffisamment la turbulence du métal en fusion qui arrive dans le réservoir, il agira comme source continuel de formation d'oxyde et de contamination durant le processus de moulage. Ceci aura des effets négatifs sur la qualité du moulage et augmentera le taux de rebuts. Pour minimiser les impuretés durant le moulage, notre projet de recherche vise à développer plusieurs conceptions de systèmes de distributions de température où le métal en fusion est filtré avant d'arriver dans la moule. Dans ce but, un modèle mathématique 3-D représentant l'écoulement de fluide turbulent couplé, ainsi que le transfert de chaleur avec solidification de région molle, a été développé pour le processus de moulage DC durant la phase stable pour un lingot roulé de taille industrielle. Plus précisément, ce modèle a été utilisé pour comprendre les interactions complexes qui se produisent entre l'écoulement de métal en fusion et l'évolution de température du lingot solidifié Al-1050 sous différentes paramètres de fusion, pour plusieurs vitesses de moulage et de fusion en surchauffe. Ce modèle est basé sur le la méthode des volumes finis. Cet algorithme simple a été utilisé pour couplé la vélocité et les champs de pression pour que les vélocités répondent à l'équation de conservation. Une formulation de phase simple a été adoptée pour résoudre les trois régions, dont liquide, molle et solide, grâce à un ensemble d'équations gouverneurs. Le modèle 'low-Reynolds number k- ε' de Launder et Sharma a été utilisé dans la région en fusion pour justifier l'augmentation de viscosité effective et la conductivité thermique effective, et donc balancer les effets de turbulence qui se présentaient. La méthode populaire 'enthalpy-porosity' a été adopté pour couplé l'équation d'énergie avec l'équation de quantité de mouvement. La loi de Darcy a été utilisée dans les équations de quantité de mouvement pour modeler l'écoulement de fusion dans la région molle. Les termes de convections des équations ont été discrétisées en utilisant la méthode de la différence hybride. Les effets de convection naturelle dans le métal liquide ont été ajoutés grâce à l'approximation Boussinesq. Le filtre, qui a été placé sur le sommet du réservoir, a été modelé grâce à l'équation 'Brinkman-Forchheimer extended Darcy' pour matières poreuses. L'approche proposé par Pedras et de Lemos a été utilisé pour modeler le courant turbulent et le transfert de chaleur dans les matières poreuses. Avec cette approche, l'opérateur de la moyenne des volumes a été appliqué à l'équation des heures de turbulence locales. Les zones de refroidissement primaires et secondaires ont été simulées en changeant le coefficient de transfert de chaleur sur la surface du lingot. Les données de coefficient de transfert de chaleur ont été prises de la littérature sur le moulage DC. Le modèle 3-D CFD a été validé contre les résultats de phases de solidification stable obtenus par d'autres études sur le moulage, pour un lingot roulé 1320 mm x 660 mm AA3104, moulé avec un système de délivrance combo 'standard bag'. La comparaison du front de solidification prévu avec les données mesurées, récupérées avec des thermocouples sacrificiels intégrés, indiquent que le modèle donne des résultats fiables.
Sung, Pil Kyung 1961. "Equilibrium partition ratios, densities, and transport phenomena in nickel-base superalloys". Diss., The University of Arizona, 1998. http://hdl.handle.net/10150/282823.
Pełny tekst źródłaKittilsen, Pål. "Mass Transport and Kinetic Phenomena in Catalytic Polymerization of Olefins". Doctoral thesis, Norwegian University of Science and Technology, Faculty of Natural Sciences and Technology, 2001. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-311.
Pełny tekst źródłaDesch, Rebecca J. "Thermodynamics and Mass Transport of Biomolecule Adsorption onto Chromatographic Media". University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1382372858.
Pełny tekst źródłaKim, Hyoungbae. "Modelling of transport phenomena in a delta-shaped, four-strand tundish". Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=19523.
Pełny tekst źródłaAboutalebi, M. Reza. "Modelling of turbulent transport phenomena and solidification in continuous casting systems". Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41514.
Pełny tekst źródłaFurthermore, a fully coupled turbulent flow and solidification model was developed to describe the turbulent transport processes in the upper part of a steel slab caster as well as to evaluate the process variables affecting the casting. Solidification modelling was carried out using a fixed grid enthalpy method while the mushy zone was modelled based on a Darcy-porosity approach. A modified low-Reynolds number version of the $ kappa$-$ epsilon$ model of turbulence was employed to calculate eddy viscosity within the liquid and mushy regions. A control volume based on finite difference method was used to solve the transport equations, wherein a SIMPLER algorithm was adopted to resolve the velocity-pressure coupling in the momentum equations. In order to verify the turbulent flow model, a water modelling study was performed for fluid flow in the mould region of a slab caster. Reasonable agreement was obtained between the mathematical model's predictions, and water modelling experiments.
Macrosegregation of carbon in a steel billet caster was also modelled based on a continuum formulation, in which the conservation equations are derived in terms of mixture dependent variables. The effect of turbulence on the transport of solute in the liquid and mushy regions was taken into account using the $ kappa$-$ epsilon$ model adopted in this work.
Various parametric studies have been preformed on different casting systems, and their effects on temperature distributions and velocity fields within the strand, solidification profiles, and trajectories of inclusions were predicted. Typical predicted results of the models have been compared against the experimental measurements on operating casters reported in the literature and relatively good agreement was obtained.
Polat, Suna. "Transport phenomena under jets impinging on a moving surface with throughflow". Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75870.
Pełny tekst źródłaImpingement surface motion, variously claimed to increase or decrease convective transfer rate, decreases Nusselt number. At industrially used conditions this decrease for slot jets is by as much as 25%.
Convective heat transfer for both single and multiple slot jets at H/w $ leq$ 8 is enhanced by throughflow according to a factor, $ Delta overline{ rm St}$/Mu$ sb{ rm s}$ = 0.17, is independent of Re$ sb{ rm j}$, Mv$ sb{ rm s}$ and extent of heat transfer surface.
In numerical prediction of impingement heat transfer with the high-Re version of the k-$ epsilon$ turbulence model, a modified Chieng-Launder nearwall model improves considerably the agreement between experiment and prediction. This model gives reasonable results for multiple and single slot jets except close to symmetry centrelines, where all such models fail, but does not eliminate the inability of numerical models to predict the effect of nozzle exit turbulence. The effect of throughflow on heat transfer under single and multiple jets is predicted for the first time, accurate to 10% for throughflow velocity up to 0.1m/s.
Williams, Wesley Charles 1976. "Experimental and theoretical investigation of transport phenomena in nanoparticle colloids (nanofluids)". Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/41224.
Pełny tekst źródłaThesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2007.
Includes bibliographical references (p. 245-255).
This study investigates the thermal transport behavior of nanoparticle colloids or nanofluids. The major efforts are: to determine methods to characterize a nanoparticle colloid's mass loading, chemical constituents, particle size, and pH; to determine temperature and loading dependent viscosity and thermal conductivity; to determine convective heat transfer coefficient and viscous pressure losses in an isothermal and heated horizontal tube; and finally to determine the feasibility for potential use as enhanced coolants in energy transport systems, with focus on nuclear application. The efforts result in proving that the two selected nanofluids, alumina in water and zirconia in water, have behavior that can be predicted by existing single phase convective heat transfer coefficient and viscous pressure loss correlations from the literature. The main consideration is that these models must use the measured mixture thermophysical properties. With the acquired knowledge of the experiments, investigation into the potential use or optimization of a nanofluid as an enhanced coolant is further explored. The ultimate goal of contributing to the understanding of the mechanisms of nanoparticle colloid behavior, as well as, to broaden the experimental database of these new heat transfer media is fulfilled.
by Wesley Charles Williams.
Ph.D.
Yu, Peter Tong-Kan. "Simulation of transport phenomena during phase change in continuous casting of steel". Thesis, University of Ottawa (Canada), 1985. http://hdl.handle.net/10393/4675.
Pełny tekst źródłaKratz, James. "Transport phenomena in vacuum bag only prepreg processing of honeycomb sandwich panels". Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=121325.
Pełny tekst źródłaLes panneaux sandwich en nid d'abeille offrent une solution extrêmement légère pour les structures aérospatiales. Avec l'augmentation de la demande pour les structures en matériaux composites, les solutions de fabrication de ces structures hors de l'autoclave sont recherchées afin de réduire les coûts. La méthode de fabrication avec sac sous vide requiert une pompe à vide pour enlever tous les gaz piégés après le drapage des matériaux préimprégnés et créer le différentiel de pression entre l'intérieur et l'extérieur du sac à vide afin de consolider les couches de composite. Cette technique peut être très efficace pour les laminés monolithiques, mais les structures en nid d'abeille présentent deux difficultés supplémentaires lorsque des nids d'abeilles non métalliques sont utilisés. D'abord, le nid d'abeille contient 98% du volume d'air piégé pendant le drapage, et deuxièmement, les nids d'abeilles non métalliques absorbent l'humidité pendant leur manipulation. L'air emprisonné dans le nid d'abeilles et l'humidité va augmenter la pression pendant la mise en forme, et peuvent créer des défauts. Cette thèse est divisée en trois thèmes pour étudier et pour optimiser le processus de fabrication des panneaux de composite sandwich avec nid d'abeilles. Tout d'abord, une condition imperméable a été appliquée sur le côté de l'outil, ce qui permet une caractérisation simple des matériaux utilisés pour la mise en forme combinés avec les matériaux préimprégnés de côté de sac à vide. La perméabilité à l'air pour les matériaux préimprégnés a été mesurée durant l'évacuation de l'air avant la cuisson, révélant un degré significatif de l'anisotropie de perméabilité à l'air. Pendant la cuisson à température élevée, la perméabilité à l'air a évolué avec le cycle de cuisson. En outre, le coefficient de diffusion de l'humidité du nid d'abeille non métallique a été caractérisé par une fonction de la concentration d'humidité et de la température. Deuxièmement, un modèle a été développé pour prédire la pression dans le nid d'abeille pendant le processus de fabrication. Des cartes de processus ont été créées afin d'identifier les combinaisons de conditions de traitement pouvant augmenter la pression dans le nid d'abeille au-dessus de la pression de consolidation. Finalement, des panneaux ont été fabriqués avec un laminé sur le côté de l'outil ainsi que sur le côté du sac à vide. Des capteurs de pression ont été incorporés pour mesurer la pression dans le nid d'abeilles pendant le processus de fabrication. La caractérisation des matériaux et la modélisation des processus développées à partir d'expériences simples à petite échelle ont permis de reproduire avec succès le comportement complexe de la pression dans le nid d'abeilles des pièces de grandes dimensions.
Kim, Do Hyun 1956. "Dynamic analysis of transport phenomena in directional solidificationn [sic] of binary alloys". Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/14280.
Pełny tekst źródłaMohan, Raj P. "Transport Phenomena In Laser Surface Alloying: A Numerical Investigation". Thesis, Indian Institute of Science, 2000. https://etd.iisc.ac.in/handle/2005/235.
Pełny tekst źródłaMohan, Raj P. "Transport Phenomena In Laser Surface Alloying: A Numerical Investigation". Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/235.
Pełny tekst źródłaFeng, Jingxing. "Transport Phenomena in Polymeric Blends and Multilayer Films". Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1548202751756984.
Pełny tekst źródłaChou, Dean. "Computational modelling of brain transport phenomena : application of multicompartmental poroelasticity". Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:8ad5cf12-e20c-4944-b27f-b3fd2951faca.
Pełny tekst źródłaYang, Guoqiang. "Bubble formation dynamics and transport phenomena in high pressure bubble columns and slurry bubble columns /". The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486474078051133.
Pełny tekst źródłaChattopadhyay, Kinnor. "Modelliing of transport phenomena for improved steel quality in a delta shaped four strand tundish". Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104793.
Pełny tekst źródłaDans la présente étude, la modélisation physique et numérique fut utilisée pour analyser l'effet sur la qualité du métal liquide de différents phénomènes de transports ayant lieu dans un panier répartiteur durant les opérations de coulée d'acier. Un modèle physique pleine échelle d'un panier répartiteur de forme triangulaire d'une capacité de douze tonnes comprenant quatre jets pour la coulée de billettes ainsi qu'un modèle mathématique utilisant le logiciel ANSYS FLUENT 12 fut utilisé. Le panier utilisant l'eau comme fluide plutôt que l'acier est une réplique de celui utilisé à l'aciérie RTIT/QIT de Sorel Tracy, Canada. Il est bien connu que les patrons d'écoulement qui se développent dans le panier affectent grandement la qualité du métal à la sortie et, en conséquence, l'insertion de modificateurs d'écoulements est pratique courante. Dans la présente étude, dix huit arrangements différents de modificateurs d'écoulements (panneaux d'impacts et digues) furent considérés et furent numériquement modélisés pour prédire l'efficacité à limiter l'entrainement d'inclusion lors de la coulée. Durant le transfert de l'acier de la poche de coulée vers le panier répartiteur, du gaz inerte est injecté dans le jet immédiatement en dessous de la valve coulissante pour prévenir l'aspiration d'air ambiant. L'effet de l'injection du gaz sur le patron d'écoulement et sur les mouvements du laitier de surface a été estimé grâce à un modèle mathématique en volume (3D) et les résultats furent validés expérimentalement en utilisant le modèle physique à l'eau contenant un laitier de microbilles de verre creuses flottantes. L'effet de l'alignement du jet provenant de la poche de coulée qui alimente le panier répartiteur fut aussi étudié par modélisation mathématique en trois dimensions et subséquemment, par des tests physiques avec l'eau. Il fut prouvé que les conséquences d'un léger désalignement vertical du jet est catastrophique et des solutions correctrices sont proposées.Durant les opérations réelles de coulées de l'acier avec panier répartiteur, les conditions ne sont pas isothermes. Il y a des pertes calorifiques provenant de la surface et des côtés du panier. Durant les opérations de changement de poche de coulée, l'acier provenant de la nouvelle poche peut aussi être plus chaud que le restant du panier provenant de la poche précédente. Les patrons d'écoulement change donc sous ces effets non isothermes et affectent aussi la qualité de l'acier sortant. Une étude poussée fut menée pour illustrer l'effet des gradients thermiques sur les patrons d'écoulements et sur la distribution de température dans le panier triangulaire.
Poehler, Scott A. "Transport Phenomena of CVD Few-Layer MoS2 As-grown on an Al2O3 Substrate". The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1440181154.
Pełny tekst źródłaYang, Rong Wei, i Rong Wei Yang. "Contributions to micromechanical modelling of transport and freezing phenomena within unsaturated porous media". Phd thesis, Université Paris-Est, 2013. http://pastel.archives-ouvertes.fr/pastel-00988021.
Pełny tekst źródłaWilkinson, Mark A. (Mark Alan). "Computational modeling of the gas-phase transport phenomena and experimental investigation of surface temperatures during flame-jet thermal spallation drilling". Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/14031.
Pełny tekst źródłaRominger, Jeffrey T. (Jeffrey Tsaros). "Hydrodynamic and transport phenomena at the interface between flow and aquatic vegetation : from the forest to the blade scale". Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/88392.
Pełny tekst źródła116
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 227-235).
From the canopy scale to the blade scale, interactions between fluid motion and kelp produce a wide array of hydrodynamic and scalar transport phenomena. At the kilometer scale of the kelp forest, coastal currents transport nutrients, microorganisms and spores. But, kelp forests exert a drag force on currents, causing the flow to decelerate and divert as it encounters the canopy, affecting the fate of species transported by the current. We identify a dimensionless flow-blockage parameter, based on canopy width and density, that controls both the length of the flow deceleration region and the total flow in the canopy. We further find that shear layers at the canopy edges can interact across the canopy, providing additional exchange between the canopy and the surrounding water. At the sub-meter scale, kelp blades are the photosynthetic engines of kelp forests, but are also responsible for the majority of the fluid drag force on the plants and for acquiring nutrients directly from the surrounding water. These blades are highly flexible structures which move in response to the local fluid forcing. Recent studies documenting changes in blade flexural rigidity in response to changes in flow demonstrate a need for understanding the role blade flexural rigidity plays in setting both drag forces, and nutrient flux at the blade surface. We create a model physical system in which we investigate the role of blade rigidity in setting blade forces and rates of scalar exchange in a vortex street. Using a combination of experimental and theoretical investigations, we find that, broadly, forces are higher for more flexible blades, countering the adage that "going with the flow" is beneficial. Below a critical value of the dimensionless blade rigidity, inertial forces from the rapidly deforming blade become significant, increasing the likelihood of blade failure. Nutrient transport is also affected by blade rigidity. As blades deform, they alter the relative fluid motion at the blade surface, affecting nutrient fluxes. We develop a novel experimental method that simulates nutrient uptake to a blade using the transport of a tracer into polyethylene. Through these experiments and modeling, we demonstrate that increased blade flexibility leads to increased scalar transport. Ultimately, blade flexural rigidity affects both mass and momentum flux.
by Jeffrey Tsaros Rominger.
Ph. D. in Environmental Fluid Mechanics
Unhale, Sanket Anil. "Cryobiology of Cell and Tissue Cryopreservation: Experimental and Theoretical Analysis". Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/202974.
Pełny tekst źródłaSharma, Karan, i Xuejun Wen. "ENGINEERING SURFACES TO SUPPORT NEURAL STEM CELLS (HNSC’S) AND HEPATOCYTES ADHESION AND GROWTH". VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4492.
Pełny tekst źródłaYang, Xiaofan. "Multi-scale simulation of filtered flow and species transport with nano-structured material". Diss., Manhattan, Kan. : Kansas State University, 2010. http://hdl.handle.net/2097/4271.
Pełny tekst źródłaBratt, Martin. "Effekter av utsläpp i flodmynningar". Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-298191.
Pełny tekst źródłaHamnefjärden is a sea area outside of Oskarshamn nuclear powerplant which has an increased temperature compared to what was natural before the powerplant was started. Ever since the cooling water from the powerplant has been affecting the ecology with constant plumes of inflow with heated water. This discharge has thus been investigated by compiling literature about the physical and biological effects on Hamnefjärden. Surveys, in which Hamnefjärden has been compared to a reference area, shows that the local ecology has been affected by the heated water somewhat. Large differences in temperature in the estuary of the coolingwater indicates large physical effects but the biological effects seem smaller.
Xynou, Marianna. "Modelling of heat and moisture transport in a corrugated board stack". Thesis, KTH, Skolan för kemivetenskap (CHE), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-158867.
Pełny tekst źródłaKe, Xinyou. "Fundamental Studies on Transport Phenomena in Redox Flow Batteries with Flow Field Structures and Slurry or Semi-Solid Electrodes: Modeling and Experimental Approaches". Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1543883710323558.
Pełny tekst źródłaDalgic, Meric. "Solutions Of The Equations Of Change By The Averaging Technique". Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609525/index.pdf.
Pełny tekst źródłaXiong, Ming. "Investigation of Transport Phenomena in the Presence of Interfaces: Forced Convection in Composite Porous/Fluid Domains, Solidification with a Mushy Region, and Meniscus Formation in Dip Coating Processing". NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20011024-185941.
Pełny tekst źródłaABSTRACTXIONG, MING. Investigation of Transport Phenomena in the Presence of Interfaces: Forced Convection in Composite Porous/Fluid Domains, Solidification with a Mushy Region, and Meniscus Formation in Dip Coating Processing (Under the direction of Andrey V. Kuznetsov)Transport phenomena play an important role in many practical applications. Every time a new technology is developed, analysis of transport processes is crucial for its success. Numerical and analytical investigations of transport processes in forced convection in composite porous/fluid domains, solidification of binary alloys, and meniscus formation in dip coating process are performed. These processes include mass, momentum, and energy transport across interfaces. For forced convection in composite porous/fluid domains, the validity of single-domain approach is investigated via comparisons between the numerical and exact solutions. An analytical solution for fluid flow described by the Brinkman-Forchheimer-Darcy equation is obtained by utilizing the boundary layer approximation. Solidification of binary alloys is studied by utilizing a porous medium approach for modeling transport processes in the mushy zone. A three-phase model is developed to predict microporosity formation during this process. Solute redistribution during this process is modeled by using the Scheil and lever rules to describe solute transport at the local scale. The investigations show that initial hydrogen concentration is an important factor affecting microporosity formation. Also, some effective ways of controlling microporosity formation are suggested based on these investigations. Another process studied in this dissertation is the dip coating with liquid carbon dioxide used as a solvent. This is a new deposition technique developed in recent years. A model accounting for evaporation during this process is obtained based on the classical free meniscus theory. Numerical results agree well with experimental data. These results show that the dry film thickness increases with the increase of evaporation rate and initial solute concentration.
Rajagopalan, Venkat N. "GENERATION OF MULTICOMPONENT POLYMER BLEND MICROPARTICLES USING DROPLET EVAPORATION TECHNIQUE AND MODELING EVAPORATION OF BINARY DROPLET CONTAINING NON-VOLATILE SOLUTE". UKnowledge, 2014. http://uknowledge.uky.edu/cme_etds/39.
Pełny tekst źródłaTrembly, Jason P. "INVESTIGATION INTO THE EFFECTS OF TRACE COAL SYN GAS SPECIES ON THE PERFORMANCE OF SOLID OXIDE FUEL CELL ANODES". Ohio University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1178651707.
Pełny tekst źródłaLemonnier, Sarah. "Rôle des phénomènes de transport dans la mise au point de stratégies thérapeutiques de réparation osseuse". Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST1031/document.
Pełny tekst źródłaThis study aims to set up methods and tools to improve our understanding of the role played by transport phenomena (transport of cells, fluid and chemical species) in the development of new therapeutic protocols for bone reconstruction, using a double approach: experimental studies and numerical simulations. Hence, in the second chapter of this document, we have been able to link the intrinsic permeability of a porous medium – a key parameter regarding fluid transport through porous media – to the geometric structure of its pores. We have also highlighted the influence of electrochemical interactions on the flow of an ionic solution (such as physiologic fluids) through cortical bone, due to its porous structure and its chemical composition (presence of electrically charged fibers). These tools have then enabled us to analyze, at first glance, the experimental results of permeability tests conducted on ovin femoral periosteum, to identify the chemical-physical phenomena responsible for the specific behavior of this membrane (chapter 5). We also focused on the development of large bone implants coupling a mineral substitute and mesenchymal stem cells to enhance a volumic reconstruction of critical-sized bone defects. We have therefore designed, in chapter 3, a custom experimental set up that allows one to perform a reproducible cell seeding test on a porous scaffold and quantify the number of seeded cells as well as their viability rate. The experimental results provided by these tests have then initiated the numerical model exposed in chapter 4, that aims to highlight criteria to meet regarding the design of new bone substitutes that would enhance a homogeneous volumic tissue growth during the first stages of the extit [in vitro} development of coupled implants
Wilson, Jacob E. "CHARACTERIZATION OF ROTARY BELL ATOMIZERS THROUGH IMAGE ANALYSIS TECHNIQUES". UKnowledge, 2018. https://uknowledge.uky.edu/me_etds/115.
Pełny tekst źródłaSaracoglu, Mehmet. "FROTH FLOTATION PERFORMANCE ENHANCEMENT BY FEED CAVITATION AND MAGNETIC PLASTIC PARTICLE ADDITION". UKnowledge, 2013. http://uknowledge.uky.edu/mng_etds/9.
Pełny tekst źródłaJhothiraman, Jivaan Kishore. "Comprehensive Methods for Contamination Control in UHP Fluids". Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/605112.
Pełny tekst źródłaMoghadam, Ali. "Capillary Forces in Partially Saturated Thin Fibrous Media". VCU Scholars Compass, 2019. https://scholarscompass.vcu.edu/etd/6110.
Pełny tekst źródłaZhou, Shanshan. "PORE-CONFINED CARRIERS AND BIOMOLECULES IN MESOPOROUS SILICA FOR BIOMIMETIC SEPARATION AND TARGETING". UKnowledge, 2017. http://uknowledge.uky.edu/cme_etds/78.
Pełny tekst źródłaMoraes, Amilton Cravo. "Um modelo para dispersão de poluentes na camada limite planetária com coeficientes de difusão dependentes da distância da fonte". Universidade Federal do Pampa, 2013. http://dspace.unipampa.edu.br:8080/xmlui/handle/riu/758.
Pełny tekst źródłaApproved for entry into archive by Cátia Araújo (catia.araujo@unipampa.edu.br) on 2017-01-25T11:33:16Z (GMT) No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Um modelo para dispersão de poluentes na camada limite planetária com coeficientes de difusão dependentes da distância da fonte.pdf: 1813716 bytes, checksum: 2b7788e4583766741e3b5c4e7ae8da30 (MD5)
Made available in DSpace on 2017-01-25T11:33:16Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Um modelo para dispersão de poluentes na camada limite planetária com coeficientes de difusão dependentes da distância da fonte.pdf: 1813716 bytes, checksum: 2b7788e4583766741e3b5c4e7ae8da30 (MD5) Previous issue date: 2013-07-15
Este trabalho apresenta a solução da equação da difusão-advecção bidimensional estacionária para simular a dispersão de poluentes na Camada Limite Planetária. A solução é obtida através do método ADMM (Analytical Dispersion Multilayer Model) e da técnica de inversão numérica utilizando o algoritmo de Fixed Talbot. A validação da solução é comprovada, mediante os parâmetros estatísticos, através do confrontamento das concentrações calculadas a partir do modelo com as obtidas experimentalmente pelo experimento de Prairie Grass. Para a determinação das concentrações utiliza-se o perfil do vento segundo o modelo de similaridade de Monin-Obukhov e os parâmetros de turbulência com dependência da distância longitudinal da fonte e da altura vertical, considerando a componente vertical do espectro Euleriano e de acordo com o modelo sugerido por Hɸjstrup que divide os espectros em alta e baixa frequência. Para efeito comparativo utiliza-se um coeficiente de difusão para grandes tempos de difusão. Os melhores resultados foram alcançados com a utilização dos coeficientes de difusão considerando a distância longitudinal da fonte e a altura vertical.
This work presents the solution of two-dimensional advection-diffusion equation stationary to simulate the dispersion of pollutants in the Planetary Boundary Layer. The solution is obtained through the ADMM method (Analytical Multilayer Dispersion Model) and the numerical inversion technique using the algorithm Fixed Talbot. Validation of the solution is proven, statistical parameters, through the confrontation of the concentrations calculated from the model with those obtained experimentally by the Experiment of Prairie Grass. For the determination of the concentration profile of the wind the form of Monin-Obukhov similarity and turbulence parameters with longitudinal distance dependence of source and of vertical height, considering the vertical component of the Eulerian spectrum and according to the model proposed by Hɸjstrup that divides the high and low frequency spectra. To use the comparative effect diffusion coefficient for large diffusion times according. The best results were achieved with the use of diffusion coefficients considering the longitudinal distance from the source and the vertical height.