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Dissertations / Theses on the topic 'Stirred vessel'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

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1

Parker, Katrina Rayanne. "Effect of breakage on crystal shape distribution in a stirred vessel." Master's thesis, Mississippi State : Mississippi State University, 2005. http://library.msstate.edu/etd/show.asp?etd=etd-04082005-101246.

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2

Yeoh, Seen Lim. "Large eddy simulation of turbulent flow and mixing in a stirred vessel." Thesis, King's College London (University of London), 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410224.

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3

Bonhomme, Adrien. "Numerical study of laminar and turbulent flames propagating in a fan-stirred vessel." Phd thesis, Toulouse, INPT, 2014. http://oatao.univ-toulouse.fr/12019/1/Bonhomme_adrien.pdf.

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Fossil energy is widely used since the 1900s to satisfy the global increasing energy demand. However, combustion is a process releasing pollutants such as CO2 and NOx. One of the major challenges of the 21th century is to reduce these emissions and car manufacturers are involved in this race. To increase fuel efficiency of piston engines, some technical solutions are developed such as ‘downsizing’. It consists in reducing the engine size while maintaining its performances using a turbocharger to increase the trapped mass in the combustion chamber. Unfortunately, downsizing can lead to abnormal

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4

Khan, Firoz R. "Investigation of turbulent flows and instabilities in a stirred vessel using particle image velocimetry." Thesis, Loughborough University, 2005. https://dspace.lboro.ac.uk/2134/14171.

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Extensive use of stirred vessels in the process industries for various operations has attracted researchers to study the mixing mechanisms and its effects on the processes. Among the various flow-measuring methods, Particle Image Velocimetry (PlV) technique has become more popular in comparison to LDA and HW A methods because of its ability to provide instantaneous velocity fields. The present study uses this technique to investigate the flowfields and turbulent properties in a 290mm vessel stirred by Rushton Disc turbine (RDT) and Pitched blade turbine (PBT) impellers. Angle-resolved instanta

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5

Bucciarelli, Elia. "Liquid-liquid dispersion in mechanically agitated vessel." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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L’argomento trattato è lo studio di due liquidi immiscibili all’interno di un recipiente agitato. Una nuova tecnica di misura delle dimensioni delle particelle viene presentata, la tecnica sperimentata è non invasiva in quanto tutti gli strumenti di misura sono stati posizionati esternamente al vessel. Il recipiente conteneva una dispersione di olio siliconico in acqua, i test sono stati condotti in assenza di coalescenza. Il sistema è agitato in un primo test da una girante Rushton e in un secondo da una girante con denti; esso consiste in un recipiente cilindrico dal diametro T=300mm in v

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6

Sanfilippo, Giorgia. "Turbulence in not fully filled vessel." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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In many chemical and biotechnological processes, mixing represents one of the fundamental unit operations, object of interest in chemical, pharmaceutical and food industries. Mixing efficiency is strongly influenced by the design and operating conditions chosen. The flow field study is important to understand which mechanism takes place in the fluid inside the stirred tank, in particular to characterize the property of the fluid and, to do that, a widely investigation techniques are used. This experimental work was carried out during the “Erasmus + for traineeship” project carried out at the

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7

Ducci, Andrea. "Direct measurement of the viscous dissipation rate of turbulent kinetic energy in a stirred vessel with two-point LDA." Thesis, King's College London (University of London), 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.487276.

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8

Rapisarda, Andrea. "Hydrodynamic characterization of two/three phase flow regimes in stirred tank." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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Questo progetto di ricerca riguarda i processi di miscelazione in sistemi multifase meccanicamente agitati(regime turbolento). I sistemi studiati sono: gas-liquido, solido-liquido e gas-solido-liquido. Lo scopo è quello di analizzare il movimento delle particelle solide all'interno di un recipiente agitato, calcolandone la velocità(n) alle quali si è ottenuto lo stato di estrazione delle particelle(nJD), della completa dispersione(nCD) e del loading(nloading), attraverso l'uso di due diversi valori di diametro delle particelle. Le misure sono state effettuate utilizzando due giranti su un alb

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9

Carrillo, De Hert Sergio. "Drop size distribution analysis of mechanically agitated liquid-liquid dispersions." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/drop-size-distribution-analysis-of-mechanically-agitated-liquidliquid-dispersions(02a0af25-3d1c-47e0-8a4e-8b2cc98cdaea).html.

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Many daily life products consist of mixtures of oil and water. When an immiscible material is dispersed an interface in-between the two phases is created which gives rise to rheological phenomena which can be exploited for product formulation; this is the case in products such as hand-creams and food products. Furthermore emulsions are used to transport hydrophobic materials, for example, many pharmaceuticals are injected as emulsions into the bloodstream. The performance of such products depends on their microstructure, which is determined by its formulation and how its constituents are mixed

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10

Wittmer, Stephan. "Caractérisation du mélange dans une cuve agitée par trajectographie." Vandoeuvre-les-Nancy, INPL, 1996. http://www.theses.fr/1996INPL037N.

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Dans cette thèse, nous essayons de développer de nouveaux outils pour la caractérisation des processus de mélange et ceci dans une approche lagrangienne. L’objectif est de trouver de l'information utile contenue dans la longue trajectoire d'une particule représentant un élément de fluide d'un écoulement turbulent. Les écoulements étudiés sont ceux induits par des turbines Rushton et à Pales inclinées dans une cuve agitée de 20 litres. Un dispositif expérimental utilisant des systèmes vidéo et d'analyse d'images a été développé pour suivre une petite particule, neutre de densité, dans trois dim

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11

Zolfagharian, Akramolmoolouk. "Solid suspension in rotary-stirred and in liquid-jet stirred vessels." Thesis, University College London (University of London), 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318665.

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12

Togatorop, Abraham. "Computational fluid mixing in stirred vessels." Thesis, University of Manchester, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295101.

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13

Street, David Alan. "Computational modelling of the stirred reaction vessels." Thesis, University of Leeds, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305422.

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14

Nikiforaki, Loukia. "Velocity and particle suspension characteristics in stirred vessels." Thesis, King's College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398026.

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15

Spragg, Andrew John Patrick. "The calculation of flow and mixing in stirred vessels." Thesis, University of Exeter, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261075.

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16

El, Hassan Zaki Mohamed Osman. "Modelling of liquid-liquid dispersions in batch stirred vessels." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46290.

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17

Hockey, Randal Myles. "Turbulent Newtonian and non-Newtonian flows in a stirred reactor." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46341.

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18

Seyed, Mahmoudi Seyed Mohammad. "Velocity and mixing characteristics of stirred vessels with two impellers." Thesis, King's College London (University of London), 1993. https://kclpure.kcl.ac.uk/portal/en/theses/velocity-and-mixing-characteristics-of-stirred-vessels-with-two-impellers(b0de9b2e-70e2-4133-9d3e-3955562edfb0).html.

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19

Baldi, Sandro. "Energy dissipation measurements in stirred vessels with particle image velocimetry." Thesis, King's College London (University of London), 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409634.

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20

Liu, Li. "Computational fluid dynamics modelling of complex fluid flow in stirred vessels." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/4753/.

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Fluid mixing in stirred vessels is widely encountered in a number of industries. In this work, different experimental techniques and the CFD modelling approach are used to measure the mixing of a wide range of fluids in stirred vessels. As the detailed validation is essential for CFD modelling, CFD predictions are compared in detail with different experimental measurements. The capability of CFD modelling of the 3D spatial distribution of velocity and solid concentration within opaque concentrated solid-liquid suspensions with the mean solid concentration up to 40 wt% is assessed by comparing

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21

Politis, Spyridon. "Prediction of two-phase solid-liquid turbulent flow in stirred vessels." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/8708.

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22

Hall, James Joseph. "Study of viscous and viscoelastic flows with reference to laminar stirred vessels." Thesis, King's College London (University of London), 2005. https://kclpure.kcl.ac.uk/portal/en/theses/study-of-viscous-and-viscoelastic-flows-with-reference-to-laminar-stirred-vessels(78790164-7ff7-4dae-bf42-c54fefafb018).html.

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23

Basbug, Salur. "Flow field and mixing in stirred vessels with regular and fractal impellers." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/58102.

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The goal of this thesis is to explore the potential benefits of fractal objects in dynamic mixing applications. To this end, the performance of an impeller with fractal blades was evaluated and compared to the one with regular, rectangular-shaped blades. Direct Numerical Simulations (DNS) were performed to compute the flow and passive scalar fields inside an unbaffled stirred vessel in the transitional flow regime. It was observed that at Re=1600 the mean power consumption decreases by ca. 8% when the regular blades are replaced by fractal ones. The physical explanation for this reduction was

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24

Forrest, Andrew E. "Gas-liquid mixing in stirred vessels imaged using electrical resistance tomography (ERT)." Thesis, University of Manchester, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488332.

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A considerable effort has been invested over the past forty or so years in attempting to thoroughly understand the basic mechanisms which govern the dispersion of gas inside mechanically stirred mixing vessels. Previous research has concentrated on visual flow studies of gas-liquid flow structures and on measurement of overall properties such as agitator power consumption and gas hold-up. Any local measurements have usually been obtained intrusively and are point-wise giving limited information about the internal flow regime. The evolution of tomographic techniques for non-medical applications

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25

Lee, Ka-Lok Carroll. "An experimental investigation of the trailing vortex structure and mixing characteristics of stirred vessels." Thesis, King's College London (University of London), 1995. https://kclpure.kcl.ac.uk/portal/en/theses/an-experimental-investigation-of-the-trailing-vortex-structure-and-mixing-characteristics-of-stirred-vessels(25fb422b-5873-4358-92c6-8a50f12806be).html.

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26

De, Renzis Diletta. "Fluid dynamic analysis in three-phase stirred tanks." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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The aim of this study is to measure the three characteristic agitator speeds (loading speed, complete dispersion speed and just drawdown speed) in a mechanically agitated vessel containing three phases (gas, solid and liquid phases). The gas phase is air, the liquid phase is a water solution with 15% (by weight) concentration of glucose and the solid phase is made by particles of polyethylene that present two different mean values of diameter (dp = 3,025mm and dp = 4,025mm). The first system considered was a vessel agitated by only one impeller (Smith turbine) and the second system was one

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27

Houcine, Imed. "Étude du mélange dans une cuve agitée de taille pilote par conductimétrie et visualisation par nappe laser couplée à un traitement d'images : application à la précipitation de l'oxalate de calcium." Vandoeuvre-les-Nancy, INPL, 1995. http://www.theses.fr/1995INPL040N.

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Le but de ce travail est de contrôler le mélange des réactifs dans des cuves de précipitation mécaniquement agitées, qui sont les précipiteurs classiques employés dans l'industrie. Outre la compréhension des interactions entre mélange et précipitation, on cherche à déterminer les géométries de précipiteurs et d'agitateurs ainsi que les conditions de fonctionnement qui conduisent à des cristaux à morphologie et granulométrie contrôlées. En sus de la méthode conductimétrique classique pour la mesure des temps de mélange ou des fluctuations de concentration, une nouvelle technique non intrusive b

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28

Assirelli, Melissa. "Micromixing studies in turbulent stirred baffled and unbaffled vessels agitated by a Rushton turbine : an experimental study." Thesis, University of Birmingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.626864.

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The parallel-competing iodide-iodate reaction scheme has been used to study micromixing phenomena in baffled and unbaffled vessel of 0.29 m diameter (T) agitated by a Rushton turbine (D=1/3T) under turbulent conditions in a semi-batch mode. Firstly it was confirmed that by using successive injections, this reaction scheme is very efficient for such a study. Using this technique for the rest of the programme of work the first experiments were undertaken in the “standard baffled geometry”. Four agitator speeds giving mean specific energy dissipation rates, T ε , from ~0.2 W/kg to ~1.2 W/kg were

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29

Garpenquist, Simon, and Carl Erik Sebastian Lindfors. "Practical investigation of mixing phenomena by physical modelling : Scaling criteria applied for bottom gas-stirred water modelling of metallurgical vessels." Thesis, KTH, Materialvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-298410.

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Gas stirring is currently the most commonly used method of homogenizing liquid steel in commercial processes. However, due to the harsh environment during the process, physical models built out of e.g. plexiglass have been used to easier understand the complex phenomenon occurring in the process. The models are also used to optimize stirring conditions and estimate mixing times. Instead of liquid steel, water has been used for modelling, to increase safety and reduce costs. The water models are usually scaled down to sizes that are easier to handle. Scaling correctly requires fulfilling common

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30

Pons, Agnès. "Analyse de la production de xanthane par xanthomonas campestris nrrl b-1459 en cuve agitee et en colonne a bulles a l'aide d'un modele structure." Clermont-Ferrand 2, 1987. http://www.theses.fr/1987CLF2D201.

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Etude comparative des performances des 2 types de bioreacteurs. Analyse du transfert de l'oxygene dans les reacteurs au cours de la fermentation et etude de son influence sur le rendement et la productivite en xanthane

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31

Spogis, Nicolas. "Metodologia para determinação de curvas de potencia e fluxos caracteristicos para impelidores axiais, radiais e tangenciais utilizando a fluidodinamica computacional." [s.n.], 2002. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266231.

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Orientador: Jose Roberto Nunhez<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica<br>Made available in DSpace on 2018-08-10T17:37:46Z (GMT). No. of bitstreams: 1 Spogis_Nicolas_M.pdf: 4452795 bytes, checksum: 7a20afda92e9e3627bb4f46cbb630b88 (MD5) Previous issue date: 2002<br>Resumo: Tanques de mistura são muito usados na indústria química, petroquímica, farmacêutica e alimentícia, onde a eficiência das operações de mistura freqüentemente tem um grande impacto no custo de produção e na qualidade do produto. O objetivo deste trabalho é determinar c

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32

Chang, chung liang, and 張中梁. "Study of characteristics of flocs breakage in a stirred vessel." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/08994441742238107263.

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碩士<br>中原大學<br>化學工程研究所<br>81<br>In order to study the characteristics of floc breakage in a stirred vessel, kaolin flocs formed with various coagulation and flocculation conditions are brokenup in a standard mixing tank. Variations of floc size, floc apparent shape, cst value and the residual turbidity of supernatant etc. under different shearing action are measurement. Results indicate that floc size measure- ment is more feasible than CST for floc's breakage determination. Since the streng

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33

ChunYuChiu and 邱浚祐. "Ozone Mass Transfer with Combined Effects ofSelf-decomposition of Ozone and Ozonationof Pollutants in a Stirred Vessel." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/21188137402847339461.

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博士<br>國立臺灣大學<br>環境工程學研究所<br>88<br>The mass transfer aspect in isothermal ozonation systems is studied. A theoretical analysis is performed employing the film model to described the mass transfer of ozone absorption, decomposition, and reaction with pollutants in aqueous solution with the decomposition and reaction rate expressions of general reaction orders (not necessarily integers). The effects of ozone self-decomposition and reaction with pollutants on the mass transfer of ozone absorption are investigated. An enhancement factor Er , defined as the ratio of mass absorbed per unit area in ti

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34

HSU-JUNG-HSIANG and 許戎翔. "Adsorption of n-Propyl Acetate and n-Butyl Acetate Binary-Component Aqueous Solution on Stirred Activated Carbon Vessel." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/23769672296522988131.

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碩士<br>長庚大學<br>化工與材料工程研究所<br>95<br>The objective of this research is to obtain the adsorption equilibrium data of the liquid binary-component solution of n-propyl acetate and n-butyl acetate at room temperature on the granular activated carbon in an Stirred adsorption vessel.The goal is to examine the adsorption isotherm of the binary-component system with the single-component adsorption isotherm. The concentration of the n-propyl acetate covers the range from 2.34 to 135.75 mmole/l. The concentration of n-butyl acetate covers the range from 0.41 to 20.60 mmole/l. To obtain the parameters with

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35

Chang, Wang Min, and 王敏昌. "Synthesis of Allyl Phenyl Ether by Tri-Liquid and Liquid-Liquid-Solid Phase Transfer Catalysis with Continuous Flow Stirred Vessel Reactors." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/98025539407520349827.

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碩士<br>國立成功大學<br>化學工程學系<br>89<br>In this study, the feasibilities of using tri-liquid-phase and liquid-liquid-solid phase transfer catalysis techniques for synthesizing allyl phenyl ether by etherification of allyl bromide (the organic reactant) and sodium phenolate (the aqueous reactant) were evaluted and compared. Tetrabutylammonium bromide, a soluble catalyst, was used in the tri-liquid-phase catalysis while the supported tributylamine, which was immobilized on the chloromethylated styrene-DVB copolymer, was employed as the triphase catalyst. Both catalytic reactions were carried out in a co

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36

Xu, Rui-Qi, and 許瑞祺. "Gas dispersion mechanism in stirred vessels with disc turbine impellers." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/61398634389477138319.

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37

Liao, Ching Wei, and 廖敬偉. "Simulation of Minimum Agitation Speed for Complete Dispersion in Liquid-Liquid Stirred Vessels." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/09272738453540919485.

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碩士<br>長庚大學<br>化工與材料工程學系<br>100<br>In this research, our goal is to discuss the liquid-liquid dispersion conditions in stirred vessels. Using Computational Fluid Dynamics simulate stirring vessels 3D flow fields. We chose the software FLUENT 6.2 with setting realizable model and Eulerian model for this liquid-liquid dispersion simulation. In our study, we used three kinds of turbine (Rushton, Scaba and A310), three stirred vessels with different diameter of vessel (T = 0.25 m, 0.3 m and 0.35 m) and two kinds of fluid (ethyl-acetate and kerosene) for dispersed phase to study the liquid-liquid

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