Tesis sobre el tema "Droplet modeling"
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Roberts, Warren B. "Black liquor droplet combustion and modeling /". Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1339.pdf.
Texto completoRoberts, Warren Benjamin. "Black Liquor Droplet Combustion and Modeling". BYU ScholarsArchive, 2006. https://scholarsarchive.byu.edu/etd/745.
Texto completoDalmaz, Nesip. "Modeling And Numerical Analysis Of Single Droplet Drying". Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606487/index.pdf.
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ZBELGE Co-Supervisor: Asst. Prof. Dr. Yusuf ULUDAg August 2005, 120 pages A new single droplet drying model is developed that can be used as a part of computational modeling of a typical spray drier. It is aimed to describe the drying behavior of a single droplet both in constant and falling rate periods using receding evaporation front approach coupled with the utilization of heat and mass transfer equations. A special attention is addressed to develop two different numerical solution methods, namely the Variable Grid Network (VGN) algorithm for constant rate period and the Variable Time Step (VTS) algorithm for falling rate period, with the requirement of moving boundary analysis. For the assessment of the validity of the model, experimental weight and temperature histories of colloidal silica (SiO2), skimmed milk and sodium sulfate decahydrate (Na2SO4&
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10H2O) droplets are compared with the model predictions. Further, proper choices of the numerical parameters are sought in order to have successful iteration loops. The model successfully estimated the weight and temperature histories of colloidal silica, dried at air temperatures of 101oC and 178oC, and skimmed milk, dried at air temperatures of 50oC and 90oC, droplets. However, the model failed to predict both the weight and the temperature histories of Na2SO4&
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10H2O droplets dried at air temperatures of 90oC and 110oC. Using the vapor pressure expression of pure water, which neglects the non-idealities introduced by solid-liquid interactions, in model calculations is addressed to be the main reason of the model resulting poor estimations. However, the developed model gives the flexibility to use a proper vapor pressure expression without much effort for estimation of the drying history of droplets having highly soluble solids with strong solid-liquid interactions. Initial droplet diameters, which were calculated based on the estimations of the critical droplet weights, were predicted in the range of 1.5-2.0 mm, which are in good agreement with the experimental measurements. It is concluded that the study has resulted a new reliable drying model that can be used to predict the drying histories of different materials.
Crounse, Brian C. (Brian Clark) 1972. "Modeling buoyant droplet plumes in a stratified environment". Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/31089.
Texto completoIncludes bibliographical references (p. 138-146).
This work describes the formulation and application of a novel two-phase integral plume model. This model describes the characteristics of a vertical plume driven by the continuous release of dissolving buoyant droplets from a fixed point in a stratified, stagnant environment. Model development is motivated by a specific application, the injection of CO 2 into the deep ocean by means of a buoyant droplet plume. This application is one method of sequestering anthropogenic C02 emissions from the atmosphere. The goal of such measures is to reduce the environmental risks associated with atmospheric emissions. Of course, sequestration of C02 in the ocean introduces other environmental concerns, as dissolved CO 2 tends to lower seawater pH. It is also necessary to ensure that the CO2 is delivered to a depth where it will not be transported to the surface over short time scales. To assess the feasibility and begin to estimate the potential for environmental impacts, a multinational group of researchers plans to conduct a pilot-scale field experiment in 2001. The aim of this work is to build a model of a buoyant droplet plume that will aid both design and interpretation of the field experiment, as well as any production-scale C02 releases. Such a model is also applicable to other two-phase plume flows. To that end, an integral model is formulated which accounts for the dynamics of the primary processes associated with a droplet plume: buoyant forces acting upon the droplets and plume water, dissolution of the droplets, turbulent entrainment of ambient water into the plume, and buoyant detrainment, or "peeling." The resulting model, at its core, is expressed as a set of nonlinear, coupled differential equations. Typical integral plume models are one-dimensional, initial-value problems which require a single integration to solve the governing equations. The particular nature of the class of plumes under investigation (droplet plumes where droplet buoyancy decreases with height due to dissolution, and dissolved C02 increases fluid density), however, is characterized by regions of upward flow, driven by the buoyant droplets, and downward flow, driven by stratification and other density effects. As these flows are coupled, solution of the governing equations for flow in each direction is iterative, increasing the complexity of the solution scheme. One implicit model assumption is that plume fluid in the vicinity of the droplets advects in the same direction as the droplets. As some coarse grid models predict that the fluid actually flows in the opposite direction, some scoping experiments were carried out to verify the nature of the velocity profile in a countercurrent droplet plume. The model is analyzed for sensitivity to both design variables, such as the flow rate of droplets at the source, and parameters which are uncertain, such as turbulent entrainment coefficients and droplet dissolution rates. In the case of C02 droplets, the dissolution rate is quite uncertain due to the formation of hydrates on the droplet surface, whose effect on mass transfer is poorly understood. Fortunately, it is clear that reduced mass transfer rates can be offset by reducing the size of the droplets. Also, while plume characteristics such as plume height are sensitive to parameter uncertainty, the dilution of C02 is strongly controlled by quantifiable factors such as the C02 mass flux and the ambient stratification. This is attributable to the density effect of dissolved C02; high concentrations of dissolved C02 creates negative buoyancy which induces mixing. This mixing aids dilution. The model is also compared to datasets describing different plume regimes in order to assess its validity. Though, when tuned to a given situation, the model agrees well with the data, there is no set of parameters which is universally applicable. Although the reasons why some parameters, such as the entrainment coefficients, change from case to case are partially understood, parameter uncertainty limits the accuracy of the model. In the case of a C02 droplet plume, the rise height predictions are estimated to be accurate to within ±30 percent.
by Brian Crounse.
S.M.
Acquaviva, Paul J. (Paul Joseph). "Process modeling of deposit solidification in droplet based manufacturing". Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/37779.
Texto completoMeacham, John Marcus. "A Micromachined Ultrasonic Droplet Generator: Design, Fabrication, Visualization, and Modeling". Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-07072006-103414/.
Texto completoMark Papania, MD, Committee Member ; Mark Allen, Committee Member ; Yves Berthelot, Committee Member ; Ari Glezer, Committee Member ; F. Levent Degertekin, Committee Chair ; Andrei G. Fedorov, Committee Chair.
Creasy, Miles Austin. "Bilayer Network Modeling". Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/28758.
Texto completoPh. D.
Healy, William M. "Modeling the impact of a liquid droplet on a solid surface". Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/16737.
Texto completoBaalbaki, Daoud. "Simulation and modeling of turbulent non isothermal vapor-droplet dispersed flow". Perpignan, 2011. http://www.theses.fr/2011PERP1085.
Texto completoThis thesis deals with the simulation and the modeling of a turbulent vapor-droplets two-phase flow at the local scale in the core of a PWR (Pressured Water Reactor) nuclear reactor during LOCA (Loss Of Coolant Accident). We consider a Euler / Euler two-phase flow model. This work specifically treats the modeling of the terms of transfer of momentum between the phases and the terms of turbulence. Thus, first we studied the limitations of some models used in the computer code NEPTUNE-CFD for this type of flows. Solutions were then proposed and implemented to improve the modeling of the hydrodynamics of the droplets and especially that of their turbulent dispersion. This thesis is part of a collaboration between IRSN and the laboratory PROMES in Perpignan
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.
Texto completoDe, Souza Lima Roger Williams. "Drying droplets as a template for multi-component solid particles : experimental study and modeling at the droplet scale Drying droplet as a template for solid formation: a review In situ Raman composition profiling in drying droplets". Thesis, Ecole nationale des Mines d'Albi-Carmaux, 2020. http://www.theses.fr/2020EMAC0003.
Texto completoLiquid droplets are one of the major means of generation of solid particles with controlled. These templates are encountered with a variety of industrial processes, among them, spray drying. These tailored structures would meet the demand for particles with controlled properties, like improved kinetics, sustained release or controlled reactivity. The major scientific obstacle is the detailed description of the components distribution inside the droplet during drying, besides prediction of the final particle morphology. An experimental/modeling approach is undertaken in this thesis to understand how the drying conditions and the liquid formulation impact the final structure of the powders. The drying systems studied were sucrose-dextran and lactose-whey protein isolate aqueous solutions. The experimental work was firstly carried out at the lab-scale spray-dryer giving a reference picture of the possible particle morphologies for the drying systems. An experimental set-up was designed and developed to suspend a liquid droplet by a filament, from which the droplet mass variation over time could be accurately measured, giving fundamental insight into the drying process and allowing the analysis of the modification of the solid structures. A novelty explored at the droplet scale with an acoustic levitator was to apply an in situ Raman spectroscopy to assess the evolution of the spatial distribution of two components in drying droplets. Finally, a 2-D droplet drying model using Computational Fluid Dynamics was developed for allowing the assessment of the spatial distribution of the droplet components under a convective drying, until the formation of a crust. A sensitivity analysis was performed in order to show the influence of the experimental conditions on the drying kinetics and the component spatial distribution
Jarauta, Arabi Àlex. "Modeling of droplet dynamics in a proton exchange fuel cell electrode channel". Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/393859.
Texto completoLas pilas de combustible son una alternativa prometedora a los dispositivos de conversión de energía convencionales. Las pilas alimentadas con hidrogeno son respetuosas con el medio ambiente y su eficiencia es hasta 3 veces mayor que la de los dispositivos de combustión de alta temperatura. Sin embargo, su precio todavía es elevado y su durabilidad es limitada. Uno de los factores clave en el rendimiento de las pilas de combustible es la denominada gestión del agua. El agua producida dentro de la pila es evacuada a través de los canales de gas, pero en condiciones de alta densidad de corriente, el agua puede bloquear el canal, limitando la densidad de corriente generada en la pila de combustible y reduciendo así su eficiencia. Nuevos métodos de análisis numérico con un coste computacional factible y una mayor precisión podrán ayudar a caracterizar el transporte de gotas en microcanales de gas. En este trabajo nos centramos en la formación de la gota, su deformación y posterior desprendimiento en los canales de gas de las pilas de combustible, ya que esto define el modo de transporte de la fase líquida más común en el problema analizado. Sin embargo, los métodos presentados podrán ser aplicados a otros problemas relacionados con un sistema gas-líquido, donde el líquido se encuentra como pequeñas gotas o películas. En la presente tesis, se ha desarrollado un modelo semi-analítico de una gota de agua que emerge de un poro de la superficie de la capa de difusión en un canal de una pila de combustible tipo PEFC (Polymer Electrolyte fuel cell). La geómetra de la gota estática y deformada se ha caracterizado y se ha supuesto que las principales variables geométricas (radio, altura, perímetro) sólo dependen de los ángulos de contacto. Las fuerzas que actúan sobre la gota son la fuerza de arrastre del aire y la fuerza de tensión superficial, que actúa como fuerza de adherencia. El estudio analítico resuelve el problema de una gota que crece en un canal de gas para ver los efectos de: i) la velocidad del aire y del caudal de líquido en la deformación de las gotas y su oscilación; y, ii) la altura de la gota en la frecuencia de oscilación. Los valores predichos tanto para la fuerza de arrastre como para la tensión superficial son más altos que los resultados encontrados en la literatura. A mayor velocidad del aire, mayor es la deformación de la gota y sus oscilaciones tienen menor frecuencia pero mayor amplitud. Se han identificado efectos similares cuando se incrementa el caudal de líquido, dando lugar a un desprendimiento más rápido de la gota. Los valores de oscilación de frecuencia predichos son significativamente menores que los valores de la literatura, pero estos resultados han sido obtenidos en condiciones distintas de inyección de agua. Como alternativa al modelo semi-analítico, se propone una formulación continua Lagrangiana para la simulación de la dinámica de gotas. El modelo se ha desarrollado en dos y tres dimensiones. Utilizando el enfoque Lagrangiano, la superficie del líquido se puede identificar con precisión. La fuerza de tensión superficial se calcula utilizando la curvatura definida por el borde de la malla Lagrangiana. Se hace especial hincapié en el tratamiento del término de tensión superficial en la versión linealizada de las ecuaciones de gobierno. La matriz tangente correspondiente permite suavizar las restricciones de paso de tiempo asociadas a la escala de la onda capilar. Se ha incluido una condición de ángulo de contacto dinámico con el fin de incluir los efectos de las superficies rugosas en la evolución de la línea de contacto. Los resultados obtenidos en los ejemplos numéricos de una gota estática en una superficie horizontal y en un plano inclinado se han comparado con resultados experimentales. Los resultados muestran una excelente concordancia con los datos experimentales. También se han comparado los resultados numéricos con el modelo semi-analítico desarrollado previamente por los autores con el _n de discutir las limitaciones del enfoque semi-analítico. Con el _n de incluir los efectos del aire sobre la gota, se presenta una formulación incrustada (embedded de su terminología en inglés) para la simulación de problemas de varios fluidos inmiscibles. El modelo anterior sólo considera el dominio de líquido, y los efectos del flujo de aire no se incluyen. El método está diseñado especialmente para la simulación de sistemas gas-líquido donde el líquido representa una pequeña fracción del dominio. El gas y el líquido se modelan mediante las formulaciones Euleriana y Lagrangiana, respectivamente. El dominio Lagrangiano (líquido) se mueve por encima de la malla Euleriana fija. La ubicación de la interfaz material se define exactamente por la posición del borde de la malla del dominio Lagrangiano. Los problemas de cada fluido se resuelven de una manera particionada y se acoplan mediante un algoritmo de Dirichlet-Neumann. La representación de la discontinuidad de la presión a través de la interfaz no requiere técnicas adicionales, ya que es una característica intrínseca del método. La formulación propuesta se valida con varios ejemplos numéricos y también se ha incluido un análisis de convergencia. Finalmente, la formulación embedded se utiliza para modelar el problema objetivo, que es la dinámica de una gota en un canal de una pila PEFC. Los ejemplos numéricos incluyen un análisis del tiempo de desprendimiento, donde la línea de contacto de la gota se fija y el desprendimiento se produce cuando se alcanza un valor de umbral de la histéresis del ángulo de contacto. Los resultados concuerdan satisfactoriamente con los datos experimentales disponibles, y los resultados utilizando el modelo semi-analítico muestran de nuevo las limitaciones de este modelo. Finalmente el ejemplo anterior se extiende incluyendo la inyección de agua en el canal de gas con el fin de comparar los resultados con estudios previos encontrados en la literatura.
Lesinski, Jake M. "A Numerical Simulation Optimizing Droplet Motion Driven by Electrowetting". DigitalCommons@CalPoly, 2019. https://digitalcommons.calpoly.edu/theses/2095.
Texto completoGe, Yang. "3D numerical study on droplet-solid collisions in the Leidenfrost regime". Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1124291953.
Texto completoTitle from first page of PDF file. Document formatted into pages; contains xxi, 225 p.; also includes graphics (some col.). Includes bibliographical references (p. 218-225). Available online via OhioLINK's ETD Center
Hwang, William. "Droplet interface bilayers for the study of membrane proteins". Thesis, University of Oxford, 2008. http://ora.ox.ac.uk/objects/uuid:0ba680ba-75f1-4cd9-9600-3e251b948a3d.
Texto completoVenkateshan, Delli Ganesh. "Modeling Fluid Motion over Fibrous Surfaces". VCU Scholars Compass, 2018. https://scholarscompass.vcu.edu/etd/5353.
Texto completoLoney, Drew Allan. "Coupled electrical and acoustic modeling of viscous fluid ejectors". Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/54247.
Texto completoDonvito, Lidia. "A Microfluidic Communication Network For Programmable Passive Droplet-Based Devices: Design, Modeling and Analysis". Doctoral thesis, Università di Catania, 2015. http://hdl.handle.net/10761/3855.
Texto completoDONVITO, LIDIA. "A microfluidic communication network for programmable passive droplet-based devices: design, modeling and analysis". Doctoral thesis, Università degli studi di Catania, 2015. http://hdl.handle.net/20.500.11769/491016.
Texto completoMicrofluidic devices represent a revolution in handling small volumes of fluids down to less than pico-liters. Droplets in these devices are used as microreactors to encapsulate samples and reagents. They are manipulated to perform laboratory functions on a single chip of only a few square centimeters in size. The aim of this thesis is the extension of the current capabilities of microfluidic passive droplet-based devices. These devices do not rely on in-chip electronics and macro-scale control supplies to actively manipulate droplets. They exploit, instead, hydrodynamic effects without requiring complex and costly production processes. Microfluidic passive droplet-based devices are mainly used for chemical and biological experiments and analyses, but lack of capabilities to perform complex and programmable laboratory workflows (i.e. they are single-purpose). These limitations can be overcome by introducing a flexible and modular microfluidic networking technology to provide to such systems a communication network for the exchange of both information and chemical/biological samples carried by droplets. The resulting microfluidic communication network will combine the specific functionalities of each connected microfluidic device, in a programmable and versatile microfluidic platform for diverse assay protocols on a single chip.
Malatkar, Jayanth. "Droplet trajectory and breakup modeling with comparisons to previous investigators' experimental results for slinger atomizers". Toledo, Ohio : University of Toledo, 2010. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=toledo1271266573.
Texto completoTypescript. "Submitted to the Graduate Faculty as partial fulfillment of the requirements for the Master of Science Degree in Mechanical Engineering." "A thesis entitled"--at head of title. Title from title page of PDF document. Bibliography: p. 90-94.
Panicker, Nithin S. "Numerical Modeling of Flow and Deformations Induced in a Droplet Subjected to Alternating Electric Field". University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1342729917.
Texto completoSuffield, Sarah Rose. "Modeling the flow of a liquid droplet diffusing into various porous media for inkjet printing applications". Online access for everyone, 2008. http://www.dissertations.wsu.edu/Thesis/Spring2008/s_suffield_041808.pdf.
Texto completoWunsch, Dirk. "Theoretical and numerical study of collision and coalescence - Statistical modeling approaches in gas-droplet turbulent flows". Thesis, Toulouse, INPT, 2009. http://www.theses.fr/2009INPT031H/document.
Texto completoCoalescence in a droplet cloud is studied in this work by means of direct numerical simulation of the turbulent gas flow, which is coupled with a Lagrangian tracking of the disperse phase. In a first step, a collision detection algorithm is developed and validated, which can account for a polydisperse phase. This algorithm is then implemented into an existing code for direct numerical simulations coupled with a Lagrangian tracking scheme. Second, simulations are performed for the configuration of homogeneous isotropic turbulence of the fluid phase and a disperse phase in local equilibrium with the fluid. The influence of both droplet inertia and turbulence intensity on the coalescence rate of droplets is discussed in a pure permanent coalescence regime. First results are given, if other droplet collision outcomes than permanent coalescence (i.e. stretching and reflexive separation) are considered. These results show a strong dependence on the droplet inertia via the relative velocity of the colliding droplets at the moment of collision. The performed simulations serve also as reference data base for the development and validation of statistical modeling approaches, which can be used for simulations of industrial problems. In particular, the simulation results are compared to predictions from a Lagrangian Monte-Carlo type approach and the Eulerian 'Direct Quadrature Method of Moments' (DQMOM) approach. Different closures are validated for the coalescence terms in these approaches, which are based either on the assumption of molecular-chaos, or based on a formulation, which allows to account for the correlation of droplet velocities before collision by the fluid turbulence. It is shown that the latter predicts much better the coalescence rates in comparison with results obtained by the performed deterministic simulations
Mokhtabad, Amrei Mana. "Modeling Fluid Interactions with Granular and Fibrous Surfaces". VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4618.
Texto completoPartridge, Daniel. "Inverse Modeling of Cloud – Aerosol Interactions". Doctoral thesis, Stockholms universitet, Institutionen för tillämpad miljövetenskap (ITM), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-60454.
Texto completoAt the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Submitted. Paper 4: Manuscript.
Fountoukis, Christos. "Modeling Aerosol - Water Interactions in Subsaturated and Supersaturated Environments". Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16242.
Texto completoKu, Shaari Ku Zilati. "Coating uniformity on a pharmaceutical tablet an experimental study and finite volume modeling of droplet impact behavior /". Morgantown, W. Va. : [West Virginia University Libraries], 2007. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5528.
Texto completoTitle from document title page. Document formatted into pages; contains xv, 141 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 132-135).
Almohammed, Naser [Verfasser]. "Modeling and Simulation of Particle Agglomeration, Droplet Coalescence and Particle-Wall Adhesion in Turbulent Multiphase Flows / Naser Almohammed". Hamburg : Helmut-Schmidt-Universität, Bibliothek, 2018. http://d-nb.info/1153126729/34.
Texto completoSongoro, Harald [Verfasser], Thomas [Akademischer Betreuer] Weiland y Gersem Herbert [Akademischer Betreuer] De. "Electrohydrodynamic Modeling of Droplet Vibrations under the Influence of Electric Fields / Harald Songoro. Betreuer: Thomas Weiland ; Herbert De Gersem". Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2015. http://d-nb.info/1111112827/34.
Texto completoRuchi, Sangeetika. "Computational Modeling of Laser Therapy of Port-Wine Stains- Based on Reduced Scattering Method". University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1428070493.
Texto completoLavi, Ido. "Physical modeling of cell motility and morphodynamics". Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS237.
Texto completoThis thesis introduces a minimal hydrodynamic model of polarization, migration, and deformation of a biological cell confined between two parallel surfaces. Our model describes the cell cytoplasm as a viscous droplet that is driven by an active cytoskeleton force, itself controlled by a diffusive cytoplasmic solute. A linear stability analysis of this two-dimensional system reveals that solute activity first destabilizes a global polarization-translation mode, prompting cell motility through spontaneous-symmetry-breaking. At higher activity, the system crosses a series of Hopf bifurcations leading to coupled oscillations of droplet shape and solute concentration profiles. At the nonlinear level, we find traveling-wave solutions associated with unique polarized shapes that resemble experimental observations. In addition, we developed a numerical simulation of our moving-boundary problem based on the finite element method. The numerical study demonstrated the stability of our traveling-wave solutions, the existence of sustained oscillatory attractors, and the emergence of a finite-time pinch-off singularity. By incorporating mechanical interactions with the external environment, we explored cell scattering from stationary walls and obstacles, migration through imposed micro-geometries, and cell-cell collisions. These exercises capture a range of nontrivial patterns resulting from the intrinsic memory and deformability of the cell. Altogether, our work offers a mathematical paradigm of active deformable systems in which Stokes hydrodynamics are coupled to diffusive force-transducers
Mandumpala, devassy Bejoy. "Atomization modeling of liquid jets using an Eulerian-Eulerian model and a surface density approach". Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4701/document.
Texto completoIn internal combustion engines, the liquid fuel injection is an essential step for the air/fuel mixture preparation and the combustion process. Indeed, the structure of the liquid jet coming out from the injector plays a key role in the proper mixing of the fuel with the gas in the combustion chamber. The present work focuses on the liquid jet atomization phenomena under Diesel engine conditions. Under these conditions, liquid jet morphology includes a separate liquid phase (i.e. a liquid core) and a dispersed liquid phase (i.e. a spray). This manuscript describes the development stages of a new atomization model, for a high speed liquid jet, based on an eulerian two-phase approach. The atomization phenomenon is modeled by defining different surface density equations, for the liquid core and the spray droplets. This new model has been coupled with a turbulent two-phase system of equations of Baer-Nunziato type. The process of ligament breakup and its subsequent breakup into droplets are handled with respect to available experiments and high fidelity numerical simulations. In the dense region of the liquid jet, the atomization is modeled as a dispersion process due to the turbulent stretching of the interface, from the side of liquid in addition to the gas side. Different academic test cases have been performed in order to verify the numerical implementation of the model in the IFP-C3D software. Finally, the model is validated with the recently published DNS results under typical conditions of direct injection Diesel engines
Capps, Shannon. "Advanced sensitivity analysis techniques for atmospheric chemistry models: development and application". Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/51755.
Texto completoJones, Dominic. "Spray Modelling without Droplet Size Segregation". Thesis, University of Manchester, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521565.
Texto completoAbdelghaffar, Walid Abdel Aziz Ibrahim. "Modelling of fuel droplet heating in diesel engines". Thesis, University of Brighton, 2005. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.418570.
Texto completoIoannou, Nikolaos. "Lattice Boltzmann modelling of droplet dynamics in confinement". Thesis, University of Strathclyde, 2016. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=27556.
Texto completoOqielat, Moa'ath Nasser. "Modelling water droplet movement on a leaf surface". Thesis, Queensland University of Technology, 2009. https://eprints.qut.edu.au/30232/1/Moa%27ath_Oqielat_Thesis.pdf.
Texto completoOqielat, Moa'ath Nasser. "Modelling water droplet movement on a leaf surface". Queensland University of Technology, 2009. http://eprints.qut.edu.au/30232/.
Texto completoBryant, Benjamin. "Modeling Moving Droplets: A Precursor Film Approach". Scholarship @ Claremont, 2003. https://scholarship.claremont.edu/hmc_theses/142.
Texto completoManica, Rogério. "Modelling hydrodynamic interactions between deformable droplets /". Connect to thesis, 2007. http://eprints.unimelb.edu.au/archive/00003700.
Texto completoLiu, Haihu. "Modelling and simulation of droplet dynamics in microfluidic devices". Thesis, University of Strathclyde, 2010. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=14370.
Texto completoElwardani, Ahmed Elsaid Youssef Mohamed. "Modelling of multi-component fuel droplet heating and evaporation". Thesis, University of Brighton, 2012. https://research.brighton.ac.uk/en/studentTheses/ace0fc77-1fa9-4c7e-a33e-e18ecb0b9f84.
Texto completoMayo, Lisa Cheree. "Mathematical modelling of the impaction and spreading of spray droplets on leaves". Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/91389/1/Lisa%20Cheree_Mayo_Thesis.pdf.
Texto completoElmedhem, Bashir A. "Modelling of liquid fuel combustion in furnaces". Thesis, University of Glasgow, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325303.
Texto completoGai, Guodong. "Modeling of water sprays effects on premixed hydrogen-air explosion, turbulence and shock waves Modeling pressure loads during a premixed hydrogen combustion in the presence of water spray Numerical study on laminar flame velocity of hydrogen-air combustion under water spray effects Modeling of particle cloud dispersion in compressible gas flows with shock waves A new formulation of a spray dispersion model for particle/droplet-laden flows subjected to shock waves Particles-induced turbulence: a critical review of physical concepts, numerical modelings and experimental investigation A new methodology for modeling turbulence induced 1 by a particle-laden flow using a mechanistic model". Thesis, Normandie, 2020. http://www.theses.fr/2020NORMIR14.
Texto completoThis PhD dissertation is dedicated to develop simple models to investigate the effect of water spray system on the premixed hydrogen-air combustion in the nuclear power plants. Specific simple models are developed to describe the water droplet evaporation in the flame, particle cloud dispersion after the shock wave passage, and turbulence length scale evolution with the presence of a water spray. A methodology is proposed to evaluate the spray evaporation effects on the propagation of the turbulent hydrogen flame inside a closed volume and a simple model is developed for the quantification of the laminar velocity deceleration with the droplets evaporation inside the flame. An analytical model is proposed for the prediction of particle cloud dispersion after the shock passage in the one-way formalism and another analytical model is dedicated to describe the spray-shock interaction mechanism and predict the appearance of a particle number density peak using the two-way formalism. A review of the important criteria and physical modelings related to the particle-induced turbulence modulation is given and a mechanistic model is used for the estimation of the turbulent integral length scales induced by the injection of particle clouds. These developed numerical models can be coupled to implement in the large-scale numerical simulations of the spray system effects on the accidental hydrogen explosions in the nuclear power plants
Poozesh, Sadegh. "INKJET PRINTING: FACING CHALLENGES AND ITS NEW APPLICATIONS IN COATING INDUSTRY". UKnowledge, 2015. http://uknowledge.uky.edu/me_etds/72.
Texto completoBradshaw, Joel. "Mathematical modelling of droplets climbing an oscillating plane". Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/33768/.
Texto completoWhitfield, Carl A. "Modelling spontaneous motion and deformation of active droplets". Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/11704/.
Texto completoBierbrauer, Frank. "Mathematical modelling of water-droplet impact on hot galvanised steel surfaces". School of Mathematics and Applied Statistics - Faculty of Informatics, 2004. http://ro.uow.edu.au/theses/400.
Texto completoEaster, Stuart. "Modelling of liquid droplet dynamics in a high DC magnetic field". Thesis, University of Greenwich, 2012. http://gala.gre.ac.uk/9149/.
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