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Dissertations / Theses on the topic 'Bubble column reactor'

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Published: 4 June 2021

Last updated: 26 July 2025

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1

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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2

Goraki, Fard Mojtaba. "CFD Modeling of Multiphase Turbulent Flows in a Bubble Column Reactor." Doctoral thesis, Universitat Rovira i Virgili, 2020. http://hdl.handle.net/10803/670965.

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Aquest treball presenta l'estudi numèric de fluxos turbulents bifàssics en un reactor de columna de bombolles en 3D utilitzant diferents models a diferents escales. En primer lloc se centra en la hidrodinàmica, las transicions del règim de flux i la transferència de massa utilitzant el model de barreja Euler-Euler k-ε per amplis rangs de velocitats superficials de gas. S'ha posat èmfasi en avaluar el rendiment d'aquest model i l'anàlisi de les transicions del règim de flux i el comportament del flux transitori dins del reactor de columna de bombolles. Es presenta la quantificació de les forces

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3

Cloete, Jannean Christelle. "Oxygen transfer in a model hydrocarbon bioprocess in a bubble column reactor." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96981.

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Thesis (MEng)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT: The expansion of the global fuels industry has caused an increase in the quantity of hydrocarbons produced as a by-product of refinery gas-to-liquid processes. Conversion of hydrocarbons to higher value products is possible using bioprocesses, which are sustainable and environmentally benign. Due to the deficiency of oxygen in the alkane molecule, the supply of sufficient oxygen through aeration is a major obstacle for the optimization of hydrocarbon bioprocesses. While the oxygen solubility is increased in the presence o

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4

Studley, Allison F. "Numerical Modeling of Air-Water Flows in Bubble Columns and Airlift Reactors." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/36380.

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Bubble columns and airlift reactors were modeled numerically to better understand the hydrodynamics and analyze the mixing characteristics for each configuration. An Eulerian-Eulerian approach was used to model air as the dispersed phase within a continuous phase of water using the commercial software FLUENT. The Schiller-Naumann drag model was employed along with virtual mass and the standard k-e turbulence model. The equations were discretized using the QUICK scheme and solved with the SIMPLE coupling algorithm. The flow regimes of a bubble column were investigated by varying the column diam

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5

Lefebvre, Jonathan [Verfasser]. "Three-phase CO2 methanation Methanation reaction kinetics and transient behavior of a slurry bubble column reactor / Jonathan Lefebvre." München : Verlag Dr. Hut, 2019. http://d-nb.info/1181515408/34.

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6

Lefebvre, Jonathan [Verfasser]. "Three-phase CO$_2}$ methanation: methanation reaction kinetics and transient behavior of a slurry bubble column reactor / Jonathan Lefebvre." Karlsruhe : KIT-Bibliothek, 2019. http://d-nb.info/1187343382/34.

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7

Adetunji, Olubode Caleb. "Hybridization of electrical resistance tomography to population balance model for accurate bubble column reactor hydrodynamic parameter predictions." Doctoral thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/22979.

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A novel approach of obtaining bubble size and spatial distribution is developed by hybridising techniques of Electrical Resistance Tomography and the Gas Disengagement Technique using a Population Balance as a framework. As a result, detailed hydrodynamic predictions suitable for Bubble Column Reactor [BER] optimisation results with minimal computing effort. Electrical Resistance Tomography [ERT] is a technique for creating 3D images of objects occurring in space. The images are obtained through current stimulations through a body surface electrodes and measurements of resulting voltage signal

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8

Qazaq, Amjad Saleh Hussein Chemical Sciences &amp Engineering Faculty of Engineering UNSW. "Application of photocatalysis to the treatment of complex industrial aqueous effluent in a pilot-scale bubble column reactor." Awarded by:University of New South Wales. Chemical Sciences & Engineering, 2009. http://handle.unsw.edu.au/1959.4/44774.

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In this study, the photocatalytic mineralization of the industrial dump-site leachate was evaluated using an internally-irradiated 18-Litre pilot-scale aerated annular bubble column photoreactor. The study includes evaluating the effect of catalyst loading, leachate initial concentration, initial solution pH, light intensity and oxygen partial pressure. The reaction runs were performed over a 48-hours period at room temperature and atmospheric pressure. Titanium catalyst loading was optimized to be 3 gL-1 where the reaction rate constant 20x10-6 mol L-1 min-1.Beyond this dosage, the effect of

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9

Sarah, Oddy. "Effect of Phase-Contacting Patters and Operating Conditions on Gas Hydrate Formation." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31414.

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Research into hydrate production technologies has increased in the past years. While many technologies have been presented, there is no consensus on which reactor design is best for each potential application. A direct experimental comparison of hydrate production technologies has been carried out in between a variety of reactor configurations at similar driving force conditions. Three main reactor types were used: a stirred tank, a fixed bed and a bubble column and compared different phase contacting patterns for the stirred tank and bubble column. In the initial phase of hydrate formatio

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10

Xiao-Xiong, Lu. "A study of the characteristics of a novel cocurrent downflow bubble column contactor for use as a three-phase reactor." Thesis, University of Birmingham, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.589427.

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A cocurrent downflow contactor (CDC) has been constructed in and potential as a reactions. Prior to studying the CDC as a reactor its performance order reactor to investigate its for use with behaviour gas-liquid-solid was investigated with respect to its hydrodynamic behaviour with liquids of varying viscosity and surface tension. Liquid systems employed were water based, containing various concentrations of sodium alginate, glycerol, and I-propanol. Parameters such as minimum inlet liquid velocity, column liquid velocity, pressure drop, bubble size, gas holdup, and gas liquid interfacial are

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11

Pinheiro, Iara Rebouças. "Estudo da produção do antibiótico antitumoral retamicina em biorreatores com células imobilizadas de Streptomyces olindensis ICB20." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-09012008-173427/.

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O objetivo deste trabalho foi estudar a produção do antitumoral retamicina por células imobilizadas de Streptomyces olindensis ICB20 em biorreatores. A imobilização das células foi conseguida após uma etapa inicial de cultivo em erlenmeyers (reativação e pré-imobilização) e posterior envolvimento em gel, utilizando-se alginato de cálcio 3%; as esferas produzidas tinham diâmetro médio de 3,0 ± 0,2 mm. Foram utilizados neste trabalho os biorreatores tipo cesta (2,4 L de volume útil) e coluna de bolhas (1,6 L de volume útil), efetuando-se cultivos em batelada simples, bateladas repetidas e contín

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12

SEYEDNEJADIAN, SIAVASH. "Renewable Power to Fuels: Dynamic Modeling of Slurry Bubble Column Reactor in Lab-scale for Fischer-Tropsch Synthesis under variable loads of synthesis gas." Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2713310.

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In recent years, Renewable Power to Fuels technology is becoming a vitally important pathway from the value-added products point of view. This electricity-to-fuel transformation is regarded as an efficient way not only to preserve renewable energy (i.e. wind and solar) and to offset the fluctuating nature of these sources but also to generate synthesis fuels with respect to the demand for, the capacity limitation and the existing infrastructure of the targeted products. In this sense, many E.U. countries are transforming CO2 into clean and the carbon-free products to achieve the targets of gre

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13

Chavada, Nilesh. "Optimization of vertical photobioreactors." University of Dayton / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1355193893.

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14

Cheng, Lei. "CO2 Separation from Coal-Fired Power Plants by Regenerable Mg(OH)2 Solutions." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1378216250.

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15

Shi, Weibin. "Dynamic modelling and simulation of turbulent bubbly flow in bubble column reactors." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/53960/.

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Considerable progress in understand and predicting turbulent bubbly flow in bubble column reactors has been advanced over the last two decades or so using a combination of model development, computational techniques and well-designed experiments. However, there remain many modelling uncertainties mainly associated with inadequate physical prescriptions rather than numerical schemes. The present project addresses some of these questions, in particular in relation to the interactions between the deformable rising bubbles and the turbulent eddies, with the later which from liquid shear flow or in

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16

Urseanu, Maria Ioana. "Scaling up bubble column reactors." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2000. http://dare.uva.nl/document/83970.

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17

KHAN, KHURRAM IMRAN. "Fluid dynamic modelling of bubble column reactors." Doctoral thesis, Politecnico di Torino, 2014. http://hdl.handle.net/11583/2528494.

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Numerical simulations of rectangular shape bubble column reactors (BCR) are validated starting from preliminary simulations aimed at identifying proper simulation parameters for a given system and resulting up to the numerical simulation with mass transfer and chemical reactions. The transient, three dimensional simulations are carried out using FLUENT software and the results obtained for a system with low gas flow rate (48 L/h) indicated that we need enough fine mesh grid and appropriate closure of interfacial forces to predict reliably plume oscillation period, liquid axial velocity and gas

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18

Béliard, Pierre-Emmanuel. "Mesure et caractérisation du transfert de chaleur dans les colonnes à bulles type slurry." Phd thesis, Université Claude Bernard - Lyon I, 2011. http://tel.archives-ouvertes.fr/tel-00846650.

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Ce travail concerne la mesure et la caractérisation du transfert thermique à la paroi externe d'un faisceau de tube de refroidissement inséré dans des colonnes à bulles type " slurry ". La valeur du coefficient de transfert de chaleur est estimée à partir des équations de la chaleur. Une colonne de 0,15 m de diamètre et de 4 m de haut, équipée de deux tubes en U (3 cm de diamètre externe), a été utilisée pour mettre au point la métrologie nécessaire. L'eau a servi de fluide de refroidissement. Le mélange diphasique air-huile Syltherm XLT®, puis le mélange triphasique air-huile Syltherm XLT®-mi

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19

Sarrafi, Amir. "Studies of holdup, mixing, and heat transfer in bubble column reactors." Thesis, University of Surrey, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299033.

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20

Manjo, Persis Yefon. "A fundamental approach to predicting mass transfer coefficients in bubble column reactors." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/9120.

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Includes bibliographical references.<br>A bubble column reactor is a vertical cylindrical vessel used for gas-liquid reactions. Bubble Columns have several applications in industry due to certain obvious advantages such as high gas-liquid interfacial area, high heat and mass transfer rates, low maintenance requirements and operating costs. On the other hand, attempts at modelling and simulation are complicated by lack of understanding of hydrodynamics and mass transfer characteristics. This complicates design scale-up and industrial usage. Many studies and models have attempted to evolve under

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21

Cartland-Glover, Gregory M. "Use of computational fluid dynamics in the design of bubble column reactors." Thesis, Aston University, 2002. http://publications.aston.ac.uk/9648/.

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Investigations into the modelling techniques that depict the transport of discrete phases (gas bubbles or solid particles) and model biochemical reactions in a bubble column reactor are discussed here. The mixture model was used to calculate gas-liquid, solid-liquid and gasliquid-solid interactions. Multiphase flow is a difficult phenomenon to capture, particularly in bubble columns where the major driving force is caused by the injection of gas bubbles. The gas bubbles cause a large density difference to occur that results in transient multi-dimensional fluid motion. Standard design procedure

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22

Hásová, Eva. "Využiti ozonu při čistění odpadních vod." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2008. http://www.nusl.cz/ntk/nusl-216450.

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Diploma thesis will be dealt with the utilization of ozone wastewater treatment. Experimental part will be focused on study of ozone utilization in two different reactors (bubble column, jet loop reactor). Reactors will be compared by overall mass transfer coefficient and saturation concentration. Ozonization will be applied because of biological resistent and toxic compound 2-mercaptobenzothiazole disposal. Changes of biological decomposition will be measured and assessed by respirometric measurements.

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23

Sudhakaran, Harikrishna. "Application of electrical resistance tomography in evaluating the influence of nozzle design on the gas hold-up in boiling bubble column reactors." Master's thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/11988.

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Includes abstract.<br>Includes bibliographical references.<br>Bubble column reactors are extensively used in the petro-chemicals industry due to the combined advantages of high rates of heat and mass transfer coupled with low operating and maintenance costs. The complex hydrodynamics brought about by the multiphase nature of such systems offer significant challenges in modelling, analysis and operation, thus making experimental measurement of system response of special importance. One such measurement technique is Electrical Resistance Tomography (ERT). In this study, the development of an exp

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24

Kundu, Arunabha. "Tree phase reactors : A, Hydrodynamics and partial wetting of trickle beds : B, absorption enhancement in gas-liquid-liquid bublle column." Toulouse, INPT, 2004. http://www.theses.fr/2004INPT003G.

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Two investigations on three phase reactors are reported : liquid flow maldistribution and partial wetting of the catalyst in trickle bed reactors, and effects of adding small amounts of organic phase on gas to aqueous phase mass transfer in a bubble column. Radial distribution of the liquid flow is investigated in a 0. 152 m in diameter fixed bed of 5 successive catalysts of various shape and size, and various trickling liquids (water, water+additives, kerosene). A model has been derived based on force balance on each fluid phase and compared to experimental results including previous works. T

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25

Wylock, Christophe. "Contribution à l'étude des transferts de matière gaz-liquide en présence de réactions chimiques." Doctoral thesis, Universite Libre de Bruxelles, 2009. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210257.

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Le bicarbonate de soude raffiné, produit industriellement par la société Solvay, est fabriqué dans des colonnes à bulles de grande taille, appelées les colonnes BIR.<p>Dans ces colonnes, une phase gazeuse contenant un mélange d’air et dioxyde de carbone (CO2) est dispersée sous forme de bulles dans une solution aqueuse de carbonate et de bicarbonate de sodium (respectivement Na2CO3 et NaHCO3). Cette dispersion donne lieu à un transfert de CO2 des bulles vers la phase liquide. Au sein des colonnes, la phase gazeuse se répartit dans deux populations de bulles :des petites bulles (diamètre de que

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26

Mamabolo, Botang. "Modelling of a slurry bubble column reactor for fischer-tropsch synthesis." Thesis, 2018. https://hdl.handle.net/10539/26003.

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A dissertation submitted to the Faculty of Engineering and the Built Environment, University of the Witwatersrand, in fulfillment of the requirements for the degree of Master of Science in Engineering. Johannesburg, 2018<br>The slurry bubble column reactor (SBCR) is of particular interest in Fischer-Tropsch (FT) reactor modelling because of its importance to gas-to-liquids processes and the technical challenges it poses. Being one of the most important and complex Fischer-Tropsch Synthesis (FTS) systems in use today, there is a need to improve the current knowledge and understanding of the SB

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27

Chen, Yi-Hung, and 陳奕宏. "A Study on Dynamic Ozonation in a Recirculating Bubble Column Reactor." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/46155335585319478546.

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28

Huang, Wun-Hui, and 黃文輝. "Study on Mass Transfer with Combined Ozone Self-Decomposition and Ozonation Reaction in a Bubble Column Reactor." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/22645084531992686412.

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博士<br>國立臺灣大學<br>環境工程學研究所<br>89<br>This study investigate the mass transfer aspect in ozonation system of BCR, considering the effect of ozonation to enhancement factor. Moreover, the relationship between pollutants removal efficiency and bubble column operating parameters are analyzed bye means of regression method. The result of the study provide an effective simulation in ozonation system of BCR A theoretical analysis is performed employing the film model to describe the mass transfer of ozone (including absorption, decomposition, and reaction with pollutants in aqueous solution).

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29

GUO, MING-ZHAO, and 郭明朝. "Oxidation of benzaldehlda with homogeneous and heterogenized homogeneous cobalt catalysts in a tubular bubble column reactor." Thesis, 1987. http://ndltd.ncl.edu.tw/handle/63878626261889160781.

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30

Zhang, Zhanying. "Optimisation and scale-up of a biotechnological process for production of L(+)-Lactic Acid form waste potato starch by Rhizopus arrhizus." 2008. http://hdl.handle.net/2440/58697.

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L(+)-Lactic acid is a commonly occurring organic acid, which is valuable due to its wide use in food and food-related industries, and its potential for the production of biodegradable and biocompatible polylactate polymers. The aim of this study was to optimize and scale-up a biotechnological process of L(+)-lactic acid production by suspended cells of R. arrhizus DAR 36017 with waste potato starch as the substrate. Commonly used inorganic and organic nitrogen sources, including ammonium sulphate, ammonium nitrate, urea, yeast extract and peptone, were assessed in conjunction with various rati

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31

Pillay, Viran. "Hydronamic study of gas-liquid co-current bubble column reactors at low superficial gas velocities." Thesis, 2005. http://hdl.handle.net/10413/2724.

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Sasol's Research and Development Division has identified several proprietary gas-liquid reactions where very low superficial gas velocities « 0.8 cmls) are required to obtain desired conversions in a bubble column reactor. A review of existing literature has shown that research in bubble column reactors is typically conducted in the superficial gas velocity range of 1 - 40 cmls. Traditionally bubble column reactors are designed via the application of empirical correlations which are only valid under specific conditions. There is a danger of under or over design if incorrect nonadjustable param

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