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Dissertations / Theses on the topic 'Residence time distribution'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 June 2025

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1

Murphy, Terry 1955. "Residence time distribution of solid particles in a CSTR." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79251.

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When mixing in a tank is insufficient solid particles are known to form a concentration gradient along the height. The one-dimensional sedimentation dispersion model provides a relationship between mixing parameters and the solids concentration gradient. An investigation of the relationship between the solid mixing properties and the solids residence time distribution, as derived from the sedimentation dispersion model has been conducted. Experimental results show that the solids residence time distribution was a function of particle size and differed from that for the liquid phase. An

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2

Nadeau, Patrice. "Measurement of residence time distribution by laser absorption spectroscopy." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22666.

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The residence time distribution was measured at ambient temperature and pressure in a tubular reactor with radial injection at very short space times (0.04-0.7 s). A technique using infrared laser absorption spectroscopy was developed and used to provide the required rapid response for concentration measurements. The equipment comprised an infrared He-Ne laser emitting at a wavelength of 3.39$ mu m$ and a lead selenide detector. Methane, which absorbs strongly at the laser wavelength, was used as the tracer. The absorption of the laser light was related to the tracer concentration by Beer-Lamb

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3

Hopley, Alexandra. "Liquid Residence Time Distribution in Micro-reactors with Complex Geometries." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37111.

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Micro-reactors, enabling continuous processes at small scales, have been of growing interest due to their advantage over batch. These advantages include better scaling, as well as improved mass and heat transfer, though many new challenges arise due to the small scales involved such as non-negligible entrance effects and significant pressure drops. The flow in coils, rectangular channel serpentine plates, mix-and-reside plates, and complex liquid-liquid mixing plates was investigated and characterized using residence time distribution (RTD) tests. A pulse test was used to determine the RTD

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4

TANYEL, ZEYNEP. "Residence Time Distribution of Multiple Particles in Four Configurations of Holding Tubes." NCSU, 2004. http://www.lib.ncsu.edu/theses/available/etd-08102004-124311/.

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Residence time distributions of multiple particles (as affected by process and system parameters) were investigated during non-Newtonian tube flow. Process parameters included flow rate, particle type, carrier fluid viscosity, and particle concentration. The system parameter of interest was the holding tube configuration. Polystyrene and acrylic particles were used as model food particles. Digital imaging analysis was used to obtain residence time data of particles. A novel type of holding tube (chaotic holding tube) was constructed. Comparisons among the straight, single helical, double helic

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5

Higgins, Philip Richard. "The characterisation of the hydrodynamic vortex separator using residence time distribution analysis." Thesis, Liverpool John Moores University, 2000. http://researchonline.ljmu.ac.uk/5534/.

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The hydrodynamic vortex separator (HDVS) is currently employed at wastewater treatment works and in the sewerage system as a combined sewer overflow (CSO) for the separation of solids from an incoming waste stream. This project presents the first stage in developing and aiding the existing design methodology for the optimisation of kinetic processes within the HDVS. The kinetic process design methodology combines hydraulic and kinetic principles by using the true mixing regime characteristics of a system and batch reactor data to determine a kinetic processes efficiency. This project used resi

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6

Kennedy, Dennis Lee. "Redesign of Industrial Column Flotation Circuits Based on a Simple Residence Time Distribution Model." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/35510.

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The potential for improved selectivity has made column flotation cells a popular choice for upgrading fine coal. Unfortunately, recent production data from full-scale column plants indicate that many industrial installations have failed to meet original expectations in terms of clean coal recovery. Theoretical studies performed using a simple dispersion model showed that this inherent shortcoming could be largely minimized by reconfiguring the columns to operate in series as a cell-to-cell circuit. Follow-up field data showed that this low-cost modification increased flotation recovery as pred

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7

Choi, Mee H. "Residence time distribution as a measure for stochastic resonance in a bistable system." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/29349.

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8

Chen, Dong. "An on-line measurement of residence time distribution in a twin-screw extruder /." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61235.

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The importance of the residence time distribution (RTD) in polymer extrusion has been recognized for along time, however, it is very difficult to measure. In this project, an optical on-line RTD measurement technique based on extrudate transmittance changes was investigated. A He-Ne laser beam was the light source, and carbon black was the tracer and detection was performed by a photomultiplier.<br>The RTD of a ZSK-30 twin-screw extruder was measured with and without an in-line rheometer installed. Various operating conditions were used to examine their effects on the RTD curve. It was found t

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9

Tiev, Visoth. "Vegetation and discharge effects on the hydraulic residence time distribution within a natural pond." Thesis, University of Warwick, 2011. http://wrap.warwick.ac.uk/49201/.

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Results are presented from sets of field and laboratory experiments conducted to measure and quantify the Hydraulic Residence Time Distribution in treatment ponds containing vegetation. The field measurements were taken in the Lyby field pond (Sweden) with complementary experiments on a distorted, laboratory scale model pond designed and built in the University of Warwick’s engineering laboratory. Rhodamine WT Dye tracer experiments were used in both the Lyby field pond and the distorted physical scale model to investigate vegetation and discharge affects on HRTD characteristics and the techni

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10

Salengke, C. "Residence time distribution of model food particles in the curved section of holding tube." The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1301602949.

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11

Payne, Robert R. U. Tatarchuk Bruce J. "Electrochemical characterization and modelling of fuel cells via AC impedance and residence time distribution." Auburn, Ala., 2008. http://hdl.handle.net/10415/1420.

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12

Al-hengari, Salah. "Process intensification : a study of micromixing and residence time distribution characteristics in the spinning disc reactor." Thesis, University of Newcastle Upon Tyne, 2012. http://hdl.handle.net/10443/1771.

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Micromixing phenomena (i.e. mixing at molecular level) play a very important role in the chemical industry when the time scale of the chemical reaction involved have the same magnitude or smaller than the time scale of mixing process. The study of micromixing is very critical to the understanding of important processes such as polymerization, precipitation, crystallization and competing fast chemical reactions. It has long been recognised that the intense mixing characteristics of thin films in the spinning disc reactor (SDR), play an important role in improving the selectivity, yield, and qua

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13

Wales, Nadine Jenifer. "The effect of prewetting on the residence time distribution and hydrodynamic parameters in trickle bed reactors." Pretoria : [s.n.], 2007. http://upetd.up.ac.za/thesis/available/etd-09042008-123057/.

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14

Parker, Brian Mark. "The Simulation and Analysis of Particle Flow Through an Aggregate Stockpile." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/35932.

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For many aggregate mining facilities, the stockpile is the preferred method of storing rock. In many aggregate mines, as well as other mines using stockpiling techniques, understanding the timing and flow of particles through a stockpile is important for correctly timing samples, making proper process adjustments and overall stockpile safety. Because much of the research of today lacks important information regarding actual interior particle movement within a stockpile, a series of Real Time Distribution (RTD) analyses and stockpile flow models have been prepared and analyzed for this study i

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15

Yim, Samson Sau Shun. "The effect of flow stability on residence time distribution of Newtonian and non-Newtonian liquids in couette flow." Thesis, University College London (University of London), 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264191.

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16

Cox, Shane Joseph Chemical Sciences &amp Engineering Faculty of Engineering UNSW. "Design and analysis of a photocatalytic bubble column reactor." Awarded by:University of New South Wales, 2007. http://handle.unsw.edu.au/1959.4/37818.

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The current work has developed a CFD model to characterise a pseudo-annular photocatalytic bubble column reactor. The model development was divided into three stages. Firstly, hydrodynamic assessment of the multiphase fluid flow in the vessel, which incorporated residence time distribution analysis both numerically and experimentally for validation purposes. Secondly, the radiation distribution of the UV source was completed. The final stage incorporated the kinetics for the degradation the model pollutant, sodium oxalate. The hydrodynamics were modelled using an Eulerian-Eulerian approach to

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17

Agizza, Maria Angela [Verfasser], Andreas Akademischer Betreuer] Dreizler, Tiziano [Akademischer Betreuer] [Faravelli, and Giancarlo [Akademischer Betreuer] Sorrentino. "Residence Time Distribution modeling of combustors through Chemical Reactor Network / Maria Angela Agizza ; Andreas Dreizler, Tiziano Faravelli, Giancarlo Sorrentino." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2020. http://d-nb.info/1211088650/34.

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Agizza, Maria Angela [Verfasser], Andreas [Akademischer Betreuer] Dreizler, Tiziano [Akademischer Betreuer] Faravelli, and Giancarlo [Akademischer Betreuer] Sorrentino. "Residence Time Distribution modeling of combustors through Chemical Reactor Network / Maria Angela Agizza ; Andreas Dreizler, Tiziano Faravelli, Giancarlo Sorrentino." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2020. http://d-nb.info/1211088650/34.

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19

Fangueiro, Gomes Leonel. "Etude du couplage hydrodynamique/adsorption : application au lit mobile simulé." Thesis, Ecully, Ecole centrale de Lyon, 2015. http://www.theses.fr/2015ECDL0031.

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Modèle monodimensionnel de type Piston-Dispersion. Le terme de dispersion axiale englobe alors toutes les imperfections de l'écoulement : injection des fluides non homogène dans l’espace et étalée dans le temps, effet de parois, et enfin volumes morts derrière les obstacles noyés dans le tamis (poutres, conduites...) dans le cas des Lits Mobiles Simulés. Cette représentation, quoique très simpliste, s'avère généralement suffisante tant que l’étalement des fronts de concentration est d'abord induit par les limitations au transfert externe, interne (macro/microporeux) et par la thermodynamique d

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20

Singh, D. P. "Flow and mixing studies in a co-rotating intermeshing twin screw extruder." Thesis, Brunel University, 1988. http://bura.brunel.ac.uk/handle/2438/5548.

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The basic understanding of mixing in the process of polymer melt extrusion by twin screw extruder is limited by their geometrical complexity and the interactions of the process parameters. Mixing and flow in a 100mm diameter, trapezoidal channeled, intermeshing co-rotating twin-screw extruder have been characterised by determination of residence time distribution (RTD) and of the paths taken by tracers added to the melt. The axial mixing and the effects of varius parameters on it were established by studying RTD using tracer techniques. As the tail of the distribution is of paramount importanc

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21

Lizima, Louis. "Hydraulic Evaluation of a Community Managed Wastewater Stabilization Pond System in Bolivia." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4360.

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This work explores the hydraulic performance of a wastewater lagoon system located in San Antonio, Bolivia. The system consists of one facultative pond and two maturation ponds in series and is managed through a locally elected water committee. A tracer study was performed on the primary facultative pond and an analysis of the solids accumulation on the bottom of the facultative lagoon was also performed. The results were used to generate residence time distribution curves and provide an estimate of mean residence time in the system. The data was used to examine hydraulic efficiency as it rela

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22

Alhamdan, Abdullah M. "Particle Residence Time Distribution and Bulk Heat Transfer Coefficients of Two-Phase Flow in Scraped Surface Heat Exchanger and Holding Tubes /." The Ohio State University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487929230742153.

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23

D'Orazio, Antonio. "Computational Fluid Dynamics Modelling of Incompressible Flow and Mixing in Continuous Microreactors." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42033.

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Continuous milli-scale and micro-scale structures such as FlowPlate® microreactors have emerged as a promising element of process intensification due to their inherently effective rates of mass and heat transfer. These microfluidic devices have proven to be a preferred solution in place of energy-intensive batch processes for certain pathways of fine chemical and pharmaceutical synthesis, most notably fast reactions taking place on the scale of milliseconds to seconds. Computational fluid dynamics (CFD) has become an increasingly valuable tool in the field of microreactor design and optimizati

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24

Langarkhorshid, Alimuhammad Rezaeipour. "A study of heat transfer, pressure drop and residence time distribution for two-phase, two component flow in a plate and frame heat exchanger." Thesis, University of East London, 1985. http://roar.uel.ac.uk/1228/.

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This thesis presents a literature review and the results of the present investigation for the upward flow of mixtures of air and water, water or air only in the channel of two Alfa-Laval plate heat exchangers. The flow patterns and their areas in the channel were identified photographically and visually. For both single-phase and two-phase flow, the embossed section of the channel was occupied by the slow and fast zones of flow. The ratio of the areas of these zones varied from nearly one to negligibly small as the flow rate of the phase(s) was increased gradually. These data were correlated e

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25

Monchatre, Benjamin. "Contribution à l'étude expérimentale d'un outil de mélange de type co-malaxeur : application aux polymères." Thesis, Saint-Etienne, 2015. http://www.theses.fr/2015STET4013/document.

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L’objectif de ce travail de thèse est la compréhension du mode de fonctionnement des co-malaxeurs, outils de mélange dont la connaissance est lacunaire par rapport à d’autres types de mélangeur comme l’extrudeuse mono-vis ou bi-vis. Ce manuscrit porte sur plusieurs études expérimentales relatives au co-malaxeur. L'influence de la vitesse de vis et du débit a été explorée par des mesures de distribution des temps de séjours (DTS), de température matière, de pression, de taux de remplissage, ainsi que de dispersion de fibres de verre. L'influence de la viscosité du polymère à l'état fondu sur la

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26

Sarang, Sanjay S. "OHMIC heating for thermal processing of low-acid foods containing solid particulates." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1197669208.

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27

Zhang, Xian-Ming. "Simulation par CFD et mesure en ligne de la distribution des temps de séjour et la qualité de mélange dans une extrudeuse bi-vis." Thesis, Vandoeuvre-les-Nancy, INPL, 2008. http://www.theses.fr/2008INPL066N/document.

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Aujourd’hui le développement de nouveaux matériaux polymères ayant de bonnes propriétés repose de plus en plus sur des procédés de mélange ou de compoundage de polymères au lieu de recourir à la synthèse de nouvelles molécules. L’action du mélange peut fortement influer sur la morphologie des matériaux polymères multi-constituants. Les extrudeuses bi-vis (TSE) sont souvent utilisées comme mélangeurs/réacteurs pour des procédés de mélange, de compoundage et d’extrusion réactive. Cependant, l’étude sur la qualité du mélange dans les TSE demeure un grand défi en raison de la complexité géométriqu

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28

Gai, Jing-Gang. "Etudes théoriques et expérimentales de la processabilité du polyéthylène à ultra-haute masse molaire." Thesis, Vandoeuvre-les-Nancy, INPL, 2009. http://www.theses.fr/2009INPL039N/document.

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Aujourd’hui le développement de nouveaux matériaux polymères ayant de bonnes propriétés repose de plus en plus sur des procédés de mélange ou de compoundage de polymères au lieu de recourir à la synthèse de nouvelles molécules. L’action du mélange peut fortement influer sur la morphologie des matériaux polymères multi-constituants. Les extrudeuses bi-vis (TSE) sont souvent utilisées comme mélangeurs/réacteurs pour des procédés de mélange, de compoundage et d’extrusion réactive. Cependant, l’étude sur la qualité du mélange dans les TSE demeure un grand défi en raison de la complexité géométriqu

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29

LINAK, WILLIAM PATRICK. "THE EFFECT OF COAL TYPE, RESIDENCE TIME AND COMBUSTION CONFIGURATION ON THE SUBMICRON AEROSOL COMPOSITION AND SIZE DISTRIBUTION FROM PULVERIZED COAL COMBUSTION (STAGED, FLYASH, SPECIES ENRICHMENT)." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/188070.

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Pulverized samples of Utah bituminous, Beulah (North Dakota) low Na lignite, Beulah high Na lignite and Texas (San Miguel) lignite coals were burned at a rate of 2.5 kg/hr in a laboratory furnace under various (overall fuel lean) combustion conditions. Particle size distributions (PSD) and size segregated particle filter samples were taken at various positions within the convection section. Temperature and gas concentrations were measured throughout. The evolution of the submicron PSD within the convection section for the four coals was similar, although the location of the initial particle mo

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30

Dedewanou, Myriam. "Vulnérabilité spécifique des forages vis-à-vis des phytosanitaires : moélisation et application au Val d'Orléans." Thesis, Orléans, 2014. http://www.theses.fr/2014ORLE2020/document.

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Les évaluations de vulnérabilité spécifiques pour les ressources d'eau souterraine sont des méthodes SIG qui établissent des indices qualitatifs spatiaux qui déterminent la sensibilité à l'infiltration de polluants superficiels. D'autre part, les fonctions de transfert, comme la Distribution de Temps de Séjour (DTS), sont utilisées pour prévoir le changement temporel de qualité de l'eau au forage, mais ils ne permettent pas de relier les concentrations aux pratiques observées sur le bassin versant. Basé sur une approche analytique, un modèle pour le transport souterrain des produits phytosanit

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31

Wang, Zhiguo. "Experimental studies and CFD simulations of conical spouted bed hydrodynamics." Thesis, University of British Columbia, 2006. http://hdl.handle.net/2429/61.

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Conical spouted beds have been commonly used for drying suspensions, solutions and pasty materials. They can also be utilized in many other processes, such as catalytic partial oxidation of methane to synthesis gas, coating of tablets, coal gasification and liquefaction, pyrolysis of sawdust or mixtures of wood residues. The main objectives of this work include both the experimental research and mathematical modelling of the conical spouted bed hydrodynamics. For experimental research, pressure transducers and static pressure probes were applied to investigate the evolution of the internal s

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32

Fortes, Nilo Henrique Meira. "Estudo da distribuição do tempo de residência em um processo de pasteurização assistido por micro-ondas." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-01112018-115416/.

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O processo de pasteurização tem como objetivo garantir a segurança e qualidade nutricional do alimento e aumentar sua vida de prateleira. O conhecimento da distribuição do tempo de residência (DTR) do alimento em cada etapa do processo contínuo é importante para uma avaliação adequada do processo e das alterações que causa no alimento. Este trabalho tem como objetivo estudar a DTR em um processo de pasteurização contínuo assistido por micro-ondas aplicado a alimentos líquidos e propor modelos de escoamento para representá-la. Para isso, foram realizados experimentos de estímulo-resposta com al

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33

Gutierrez, Carola Gean Carla Cavero. "Distribuição do tempo de residência em processo de pasteurização com trocador de calor a placas." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-30052008-155723/.

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É apresentado um estudo de distribuição do tempo de residência nas etapas de um processo de pasteurização contínuo por trocador de calor a placas (aquecimento, resfriamento, regeneração e retenção). Para o estudo experimental, foi adotada a técnica condutimétrica usando cloreto de sódio em solução aquosa como traçador. Foram verificadas as influências da vazão, da configuração do trocador de calor a placas (número de passes para o arranjo em série) e do tipo de tubo de retenção (tubo em \"S\" e tubo helicoidal). Modelos de distribuição foram usados para representar o comportamento experimental

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34

Pegoraro, Paula Rossato. "Distribuição do tempo de residência e letalidade no processamento térmico contínuo de líquidos com escoamento laminar não ideal em trocadores bitubulares." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-10052012-122241/.

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Os trocadores de calor tubulares são muito utilizados para o processamento térmico de alimentos líquidos viscosos por possuírem um maior diâmetro hidráulico em comparação aos trocadores de calor a placas. O cálculo da letalidade neste tipo de trocador está diretamente relacionado ao perfil de velocidade e à distribuição do tempo de residência (DTR). Para escoamento laminar de fluidos viscosos, Newtonianos e não-Newtonianos, geralmente adota-se um perfil de velocidade laminar e de lei de potência, respectivamente. No entanto, algumas características do equipamento como irregularidades na tubula

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35

Colin, Baptiste. "Modélisation de la torréfaction de plaquettes de bois en four tournant et validation expérimentale à l’échelle d’un pilote continu de laboratoire." Thesis, Ecole nationale des Mines d'Albi-Carmaux, 2014. http://www.theses.fr/2014EMAC0015/document.

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La torréfaction est un traitement thermique à basse température (250 à 300 °C) en atmosphère inerte qui permet de modifier les propriétés de la biomasse. La biomasse torréfiée est alors plus dense énergétiquement, plus hydrophobe et plus fragile. Dans cette étude, un modèle numérique de torréfaction en four tournant à une dimension a été développé. Le transport des plaquettes de bois, les transferts thermiques, le séchage ainsi que les cinétiques de torréfaction ont été modélisés séparément. Après confrontation aux résultats expérimentaux, ces différents sous-modèles ont été assemblés dans un

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36

Do, Nascimento Arrais Murilo Ricardo. "Vers une meilleure distribution des fluides dans les réacteurs polyphasiques." Electronic Thesis or Diss., Université de Toulouse (2023-....), 2024. http://www.theses.fr/2024TLSEP066.

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La maldistribution des phases dans les réacteurs millistructurés de type monolithe est un inconvénient majeur pour les réactions gaz-liquide, qui freine le déploiement de cette technologie à l'échelle industrielle. En effet, ce problème est d'autant plus gênant pour les réacteurs monolithes, qui sont plus efficaces que les réacteurs classiques pour les réactions catalytiques si la distribution des fluides est uniforme.Afin de résoudre ce problème, un distributeur gaz-liquide original avec une géométrie basée sur une jonction en T, et conçu au LGC pour un monolithe à 84 canaux, a été construit

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Yucel, Cakal Gaye O. "Dynamic Behavior Of Continuous Flow Stirred Slurry Reactors In Boric Acid Production." Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12605047/index.pdf.

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One of the most important boron minerals, colemanite is reacted with sulfuric acid to produce boric acid. During this reaction, gypsum (calcium sulfate dihydrate) is formed as a byproduct. In this study, the boric acid production was handled both in a batch and four continuously stirred slurry reactors (4-CFSSR&rsquo<br>s) in series system. In this reaction system there are at least three phases, one liquid and two solid phases (colemanite and gypsum). In a batch reactor all the phases have the same operating time (residence time), whereas in a continuous reactor all the phases may have diff

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38

Caldas, Pereira Silveira Arlan. "Caractérisation expérimentale et comportement de constituants protéiques et minéraux laitiers en concentration sous vide." Thesis, Rennes, Agrocampus Ouest, 2015. http://www.theses.fr/2015NSARB269/document.

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Les évaporateurs à flot tombant (EFT) sont largement utilisés dans les industries chimiques, de la réfrigération, du raffinage du pétrole, et alimentaires. Dans l'industrie laitière, les EFT sont appliqués pour la concentration de solutions avant l'étape de séchage. Malgré l'importance économique du procédé d'évaporation sous vide dans la fabrication de produits laitiers déshydratés, la connaissance du procédé est essentiellement empirique. Des recherches visant à améliorer l'efficacité du procédé sont donc nécessaires. L'objectif de ce projet de doctorat est de caractériser expérimentalement

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Dülle, Matthias [Verfasser], and Claudia S. [Akademischer Betreuer] Leopold. "Investigations on the powder behaviour and the residence time distribution within a production scale rotary press with special focus on its geometric and parametric setups / Matthias Dülle ; Betreuer: Claudia S. Leopold." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2019. http://d-nb.info/1193650763/34.

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40

Skalak, Katherine Joanne. "Fine-grained channel margin deposits in a typical gravel bed river spatial and temporal controls on the distribution, quantity, and residence time and implications for centennial-scale sediment and mercury cycling /." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 437 p, 2009. http://proquest.umi.com/pqdweb?did=1885693201&sid=5&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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Varinot, Christelle. "Contrôle de la distribution granulométrique en broyage fin continu." Vandoeuvre-les-Nancy, INPL, 1996. http://www.theses.fr/1996INPL109N.

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Compte tenu des exigences de plus en plus draconiennes sur la qualité des poudres utilisées dans l'industrie pharmaceutique, les cosmétiques, les céramiques etc qui doivent être de plus en plus fines avec des diamètres moyens précis, le contrôle de la distribution granulométrique dans les opérations de réduction de taille est devenu une préoccupation majeure. Dans ce travail de thèse qui porte sur l'étude du broyage du carbone dans un broyeur à billes agité humide, nous nous sommes donc attachés à définir les conditions de fonctionnement permettant d'obtenir des produits de granulométrie déter

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Treguer, Véronique. "Recherche des conditions optimales de mise en contact de particules solides et de gouttelettes dans un réacteur à jets : application au craquage catalytique." Vandoeuvre-les-Nancy, INPL, 1995. http://docnum.univ-lorraine.fr/public/INPL_T_1995_TREGUER_V.pdf.

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Les réacteurs à impact de jets, contenant ou non des phases dispersées, constituent une classe mal connue de réacteurs. Dans le cas du procédé de craquage catalytique trois phases sont mises en jeu : du gaz, des particules de catalyseur et des gouttelettes de charge pétrolière. La zone de mise en contact initiale des jets de réactifs semble particulièrement déterminante pour le rendement global de la réaction. L’objet de ce travail est donc l'étude expérimentale du comportement global des phases continues ou dispersées au cours de leur mise en contact qui s'effectue en des temps de l'ordre de

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Gatehouse, Hazel A. W. "Ecology of the naturalisation and geographic distribution of the non-indigenous seed plant species of New Zealand." Diss., Lincoln University, 2008. http://hdl.handle.net/10182/1009.

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The naturalisation and subsequent spread of non-indigenous plant species (NIPS) is a major problem for most regions of the world. Managing plant invasions requires greater understanding of factors that determine initial naturalisation and distribution of wild NIPS. By the year 2000, 2252 NIPS were recorded as wild (1773 fully naturalised and 479 casual) in New Zealand. From published literature and electronic herbaria records, I recorded year of discovery of wild populations, and regional distribution of these wild NIPS. I also recorded species related attributes hypothesised to affect natural

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Ortwein, Andreas. "Modellierung der Hochdruck-Partialoxidation von Heiz- und Schweröl." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2012. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-88104.

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Für die Modellierung der Hochdruck-Partialoxidation von Heiz- und Schweröl werden zunächst Untersuchungen des Einsatzstoffes durchgeführt, um deren Verdampfungs- und Pyrolyseverhalten zu bestimmen. Dazu wird das Verfahren der Hochdruck-Thermogravimetrie verwendet. Mit Hilfe der numerischen Strömungsmechanik unter Anwendung von detaillierten Reaktionsmechanismen und eines umfangreichen Partikelmodells werden die Zustände im Reaktor modelliert. Die Validierung mit Verweilzeitmessungen wird demonstriert und damit verbundene Probleme aufgezeigt. Anhand von Untersuchungen am Vergasungsrückstand kan

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45

Matsumoto, Danielle. "Modelagem e simulação de reator solar usando fluidodinâmica computacional." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-06072014-220539/.

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Este estudo apresenta a modelagem fluidodinâmica de um reator solar utilizado para Processos Oxidativos Avançados (POA). Desenvolveu-se um modelo que considera a fluidodinâmica, o campo de radiação e cinética da reação de actinometria química (ferrioxalato), em regime transiente. Essa modelagem foi feita utilizando-se o código de fluidodinâmica computacional PHOENICS. Para análise dos resultados de simulações com o modelo, consideraram-se os dados experimentais de actinometria química para um trecho do reator, constituído de dois tubos (hairpin), e de distribuição de tempos de residência (DTR)

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Charlou, Christophe. "Caractérisation et modélisation de l’écoulement de boues résiduaires dans un sécheur à palettes." Thesis, Ecole nationale des Mines d'Albi-Carmaux, 2014. http://www.theses.fr/2014EMAC0004/document.

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Le séchage est une opération incontournable pour la valorisation énergétique des boues résiduaires. La flexibilité pour ajuster la teneur en matière sèche finale de la boue est un critère important pour le choix d'une technologie. Cet objectif est difficile à atteindre pour les sécheurs à palettes. La modélisation du processus est alors essentielle. Malheureusement, le comportement rhéologique des boues est complexe et la mécanique des fluides numérique est hors de portée. La notion de Distribution des Temps de Séjour est employée ici pour caractériser l'écoulement. Un protocole fiable et repr

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Peres, José Carlos Gonçalves. "Análise de um reator fotoquímico anular usando a fluidodinâmica computacional." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-15052013-184542/.

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Os processos oxidativos avançados são promissores para a degradação de compostos orgânicos resistentes aos tratamentos convencionais, como o fenol. A fluidodinâmica computacional (CFD) tornou-se uma poderosa ferramenta para analisar processos fotoquímicos por resolver os balanços acoplados de quantidade de movimento, de massa e de radiação. O objetivo deste trabalho é investigar o processo UV/H2O2 num reator fotoquímico anular usando CFD e um modelo cinético mais realista. O modelo em CFD foi criado de forma progressiva. Inicialmente, foram determinados os campos de velocidade para três vaz

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Harris, A. T. "Residence time distributions in circulating fluidised beds." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.603761.

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The major focus of the work is on the measurement and simulation of the particle residence time distribution in the square cross section riser of a laboratory scale, cold model, circulating fluidised bed. To this end, a novel measurement technique was developed using phosphorescent tracer particles and a light based tracer injection and detection system. Experimental results confirm that the RTD is sensitive to changes in superficial gas velocity, external solids flux and the geometry of the riser exit. Simulations made using a novel stochastic particle RTD model are in good agreement with the

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Nakama, Caroline Satye Martins. "Modelagem estocástica da dispersão axial: aplicação em um reator tubular de polimerização." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-30062016-082711/.

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Reatores tubulares de polimerização podem apresentar um perfil de velocidade bastante distorcido. Partindo desta observação, um modelo estocástico baseado no modelo de dispersão axial foi proposto para a representação matemática da fluidodinâmica de um reator tubular para produção de poliestireno. A equação diferencial foi obtida inserindo a aleatoriedade no parâmetro de dispersão, resultando na adição de um termo estocástico ao modelo capaz de simular as oscilações observadas experimentalmente. A equação diferencial estocástica foi discretizada e resolvida pelo método Euler-Maruyama de forma

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Urmès, Caroline. "Expérimentation et modélisation dynamiques de réacteurs catalytiques : vers une meilleure description du processus catalytique." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1226/document.

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L'étude cinétique d'une réaction catalytique permet une meilleure compréhension du mécanisme réactionnel et du fonctionnement du catalyseur. Elle est nécessaire pour le dimensionnement des réacteurs et des procédés. Les modèles micro-cinétiques sont constitués d'une séquence d'étapes élémentaires sans hypothèses sur les étapes cinétiquement déterminantes. Ces modèles sont applicables sur des plages de conditions opératoires plus larges que celles des modèles plus classiques de type Langmuir-Hinshelwood (LH) ou d'Hougen-Watson. Lorsqu'ils sont implémentés dans un modèle de réacteur, ils permett

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