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Dissertations / Theses on the topic 'Structured packing'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Erasmus, Andre Brink. "Mass transfer in structured packing." Thesis, Stellenbosch : University of Stellenbosch, 2004. http://hdl.handle.net/10019.1/16045.

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Thesis (PhD)--University of Stellenbosch, 2004.<br>ENGLISH ABSTRACT: Structured packing is a popular column internal for both distillation and absorption unit operations. This is due to the excellent mass transfer characteristics and low pressure drop that it offers compared to random packing or trays. The main disadvantage is the lack in reliable models to describe the mass transfer characteristics of this type of packing. The recent development of the non-equilibrium model or rate based modelling approach has also emphasized the need for accurate hydraulic and efficiency models for she

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2

Higginbotham, Paul. "Structured packing in air distillation." Thesis, Aston University, 1993. http://publications.aston.ac.uk/9585/.

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An economic analysis has been performed to establish when it is advantageous to use structured packing in air separation plant. A model of a low pressure cycle was developed to calculate the power saved when packing is used, and cost models were developed for the columns and cold box. The rate of return was calculated on the extra investment required for a packed plant based on the annual power saving. Structured packing was found to be economic only in larger plants, where economies of scale mean that the increased capital cost becomes less significant compared with the power saved. It was al

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3

Kawesha, David Mukuma. "A mass transfer model for structured packing." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52647.

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Thesis (MScEng) -- Stellenbosch University , 2002.<br>ENGLISH ABSTRACT: The distillation process is the most widely used separating process in the chemical process industry. The optimal design of the distillation units can lead to reduced capital costs and improved energy utilisation. This is particularly the case for structured packed distillation column where design methods tend to over-predict the column efficiency. This work seeks to contribute to the development of a reliable mass transfer model for structured packing. A gas phase mass transfer correlation was developed based on th

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4

Ataki, Adel. "Wetting of structured packing elements CFD and Experiment /." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=981239463.

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5

Van, der Westhuizen Francois Erasmus. "Vapour phase mass transfer coefficients in structured packing." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/1966.

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6

Cooke, Jason. "Modelling of reactive absorption in gas-liquid flows on structured packing." Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/397079/.

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Carbon capture & storage (CCS) is at the technological forefront in the challenge of reducing carbon emissions. The most viable approach to implementing CCS within existing coal and natural gas power stations is the post-combustion capture of CO2 by absorption into amine solutions within packed column absorbers. CFD modelling is an important aspect in the design and optimisation of this process. However, significant challenges arise due to the large range of spatial scales and the complexity of the physics being modelled. Therefore, simplification of the problem is required to complete such si

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7

Paquet, Emil Friedrich. "Establishing a facility to measure the efficiency of structured packing under total reflux." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6834.

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Thesis (MScEng (Process Engineering))--University of Stellenbosch, 2011.<br>ENGLISH ABSTRACT: Structured packing is often the preferred choice for column internals because of its low pressure drop and high efficiencies compared to that of trays and random packing. However, the mass transfer phenomena in these gas-liquid contacting devices is still not well understood, even though it is widely used in industry. A contributing factor to this is the lack of understanding and availability of experimental data in the open literature. These shortcomings complicate the design of a distillation c

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8

Sebastia-Saez, J. Daniel. "CFD modelling of post-combustion carbon capture with amine solutions in structured packing columns." Thesis, Cranfield University, 2016. http://dspace.lib.cranfield.ac.uk/handle/1826/10024.

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The scope of the present thesis is the development of a Computational Fluid Dynamics model to describe the multiphase flow inside a structured packing absorber for postcombustion carbon capture. The work focuses mainly on two flow characteristics: the interface tracking and the reactive mass transfer between the gas and the liquid. The interface tracking brings the possibility of studying the liquid maldistribution phenomenon, which strongly affects the mass transfer performance. The development of a user-defined function to account for the reactive mass transfer between phases constitutes the

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9

Subramanian, Kumar. "Analysis of homogeneous film flows on inclined surfaces and on corrugated sheet of packing using CFD." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2015. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-164588.

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The key to success in separation of liquid mixtures is the efficient creation and utilization of vapour-liquid contact area. By packing the column with gas-liquid contact devices such as structured packing, the vapour-liquid contact area can be increased. However, the efficiency of these packed columns depends strongly on the local flow behaviour of the liquid and vapour phase inside the packing. The aim of this work was to develop three-dimensional CFD models to study the hydrodynamic behaviour on the corrugated sheets of packing. Different approaches are possible to simplify the problem and

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10

Soulaine, Cyprien. "Modélisation des écoulements dans les garnissages structurés : de l'échelle du pore à l'échelle de la colonne." Thesis, Toulouse, INPT, 2012. http://www.theses.fr/2012INPT0089/document.

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Une colonne de séparation d'air réalise un écoulement liquide-gaz à contre courant dans une structure complexe, le garnissage. Au sein de ce garnissage, l'écoulement du liquide est du type film drainé par gravité, alors que l'écoulement du gaz est turbulent. La fonction de ces contacteurs est de développer une surface d'échange interfaciale aussi grande que possible pour favoriser le transfert d'un composé chimique de la phase liquide vers la phase vapeur (et inversement) tout en offrant des pertes de charge raisonnables. Ces dispositifs sont constitués par l'assemblage de plaques métalliques

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11

Kubíček, Jan. "Moderní metody mokrého čištění spalin." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229344.

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Research of conditions when sulphure dioxide is absorbed from flue gas, is the main objective of this master's thesis. Efficiency of this flue gas cleaning was measured on an experimental device, which consist of an absorption column filled with structured packing’s, and another component so-called "O-element". Further, a possibility of upgrade this "O-element" to tread more flue gas is presented.

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12

Bartlok, Guido. "Untersuchungen zur Neuverteilung der Rücklaufflüssigkeit in Packungskolonnen." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2002. http://nbn-resolving.de/urn:nbn:de:swb:14-1038918418015-57600.

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Bei der Rektifikation werden heute zunehmend Füllkörperkolonnen mit geordneten Packungen eingesetzt. Die Maldistribution, ein bislang ungelöstes Problem in Füllkörperkolonnen, wirkt sich negativ auf die Stoffaustauschleistung aus. Zur Verringerung der Maldistribution wird zwischen den Packungssektionen mehrfach die Rücklaufflüssigkeit gesammelt und erneut gleichmäßig über den Kolonnenquerschnitt verteilt. Diese Neuverteilung realisieren Zwischenverteiler, die somit einen Großteil der Kolonnenhöhe beanspruchen und damit die Investitions- und Betriebskosten erheblich erhöhen. Hauptursache für di

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13

Valluri, Prashant. "Multiphase fluid dynamics in structured packings." Thesis, Imperial College London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.415894.

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14

Allen, Sam D. "Algorithms and data structures for three-dimensional packing." Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/12779/.

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Cutting and packing problems are increasingly prevalent in industry. A well utilised freight vehicle will save a business money when delivering goods, as well as reducing the environmental impact, when compared to sending out two lesser-utilised freight vehicles. A cutting machine that generates less wasted material will have a similar effect. Industry reliance on automating these processes and improving productivity is increasing year-on-year. This thesis presents a number of methods for generating high quality solutions for these cutting and packing challenges. It does so in a number of ways

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15

Coles, L. Susanne. "The acetanilide crystal structures : packing and conformational similarities." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/193145/.

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The dependence of crystal structure assembly on molecular changes has been studied for mono-substituted acylanilides. A library of 255 crystal structures has been investigated. 217 structures were determined during this project and 38 originated from the CSD. A subset of 64 mono-substituted acetanilides was studied in detail for crystal structure similarities using the XPac algorithm and conformational preferences were assessed. Chapter 4 presents the crystal structures and their structural similarities, whilst Chapter 5 focuses on the theoretical conformational analysis. Three amide-amide hyd

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16

Tschammer, Nuska. "HELICAL PACKING REGULATES STRUCTURAL TRANSITIONS IN BAX." Doctoral diss., University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3231.

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Apoptosis is essential for development and the maintenance of cellular homeostasis and is frequently dysregulated in disease states. Proteins of the BCL-2 family are key modulators of this process and are thus ideal therapeutic targets. In response to diverse apoptotic stimuli, the pro-apoptotic member of BCL-2 family, BAX, redistributes from the cytosol to the mitochondria or endoplasmic reticulum and primes cells for death. The structural changes that enable this lethal protein to transition from a cytosolic form to a membrane-bound form remain poorly understood. Elucidating this process is

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17

Tyomkyn, Mykhaylo. "Packings and embeddings of combinatorial structures." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609410.

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18

Durand, de Gevigney Olivier. "Orientations des graphes : structures et algorithmes." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENM027/document.

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Orienter un graphe c'est remplacer chaque arête par un arc de mêmes extrémités. On s'intéresse à la connexité du graphe orienté ainsi obtenu. L'orientation avec des contraintes d'arc-connexité est maintenant comprise en profondeur mais très peu de résultats sont connus en terme de sommet-connexité. La conjecture de Thomassen avance que les graphes suffisament sommet-connexes ont une orientation k-sommet-connexe. De plus, la conjecture de Frank propose une caractérisation des graphes qui admettent une telle orientation. Les résultats de cette thèse s'articulent autour des notions d'orientation,

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19

Tisi, Laurence Carlo. "Studies on the folding and packing of protein structures." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390040.

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20

Minor, Daniel Louis. "Tertiary packing effects on secondary structure formation in proteins." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/39379.

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21

Hodson, Jennifer. "Computational fluid dynamical studies of structured distillation packings." Thesis, Aston University, 1997. http://publications.aston.ac.uk/9611/.

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In recent years structured packings have become more widely used in the process industries because of their improved volumetric efficiency. Most structured packings consist of corrugated sheets placed in the vertical plane The corrugations provide a regular network of channels for vapour liquid contact. Until recently it has been necessary to develop new packings by trial and error, testing new shapes in the laboratory. The orderly repetitive nature of the channel network produced by a structured packing suggests it may be possible to develop improved structured packings by the application of

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22

Pasquier, Sylvain. "Modeling two-phase flows in columns equipped with structured packings : a multiscale porous medium approach." Thesis, Toulouse, INPT, 2017. http://www.theses.fr/2017INPT0070/document.

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La technologie la plus utilisée pour séparer les principaux composants de l'air est aujourd'hui ladistillation en colonne à garnissage structuré. Ce procédé se caractérise par un écoulement gazliquide contre-courant au sein d'une structure constituée de plaques corruguées placées parallèlement et agencées en packs. La description d'un tel procédé est rendue difficile par les très grandes dimensions du système et par la complexité des phénomènes à la petite échelle. La méthode de la prise de moyenne volumique, utilisée pour les problèmes de changement d'échelleen milieu poreux, est utilisée pou

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23

Brown, Nigel P. "Patterns in protein secondary structure packing : a database for prediction." Thesis, University College London (University of London), 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315268.

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24

Ugail, Hassan. "Parametric design and optimisation of thin-walled structures for food packaging." Springer, 2003. http://hdl.handle.net/10454/2647.

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In this paper the parametric design and functional optimisation of thin-walled structures made from plastics for food packaging is considered. These objects are produced in such vast numbers each year that one important task in the design of these objects is to minimise the amount of plastic used, subject to functional constraints, to reduce the costs of production and to conserve raw materials. By means of performing an automated optimisation on the possible shapes of the food containers, where the geometry is parametrised succinctly, a strategy to create the optimal design of the containers

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25

Barclay, Nicola. "Fault replication as a method of coding information." Thesis, University of Ulster, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263277.

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26

Conley, Clark Logan. "Cliqued holes and other graphic structures for the node packing polytope." Thesis, Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/2300.

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27

Muluneh, Melaku. "Soft Colloids from p(NIPAm-co-AAc): Packing Dynamics and Structure." Thesis, Harvard University, 2012. http://dissertations.umi.com/gsas.harvard:10454.

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Traditionally, the experimental model of choice for studying the structure and dynamics of glasses or crystals are hard-sphere colloids. An analogy with molecular or atomic materials is often drawn, in which each colloidal particle represents an atom or a molecule. Making the individual particles deformable allows an even wider range of phenomena to be observed. In this thesis, I report the three-dimensional confocal microscopic study of the structure and dynamics of aqueous suspensions of fluorescently labeled poly(N-Isopropylacrylamide)-co-(Acrylic Acid), or p(NIPAm-co-AAc), microgel particl

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28

Ford, Zakhia. "Determining the Crystal Structure of Cellulose III by Modeling." ScholarWorks@UNO, 2005. http://scholarworks.uno.edu/td/291.

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Recently, a one-chain monoclinic unit cell for Cellulose IIII having a single glucose in the asymmetric unit was proposed based on high-resolution diffraction patterns. The new work challenged a two-chain structure published 25 years earlier, although it did not provide new three-dimensional coordinates. Our goals were to solve the structure by modeling, find whether modeling would reject the previously determined two-chain unit cell, and compare the model with the anticipated experimental structure. Combinations of the O2, O3, and O6 hydroxyls produced 54 starting structures. Cluster

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29

Tranter, Dale Brendan. "Role of α-helix packing in structure, stability and function in opsins". Thesis, University of Essex, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.537949.

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30

Song, Guolin. "Modelling and characterisation of carton packaging structures." Thesis, University of Leeds, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434247.

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31

Sakthivel, A. "Crystal structures of cellulose II derived from packing energy minimization by A Sakthivel." Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/16464.

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32

Irvine, Chelsea Nicole. "Suns: a new class of facet defining structures for the node packing polyhedron." Thesis, Kansas State University, 2012. http://hdl.handle.net/2097/13729.

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Master of Science<br>Department of Industrial and Manufacturing Systems Engineering<br>Todd Easton<br>Graph theory is a widely researched topic. A graph contains a set of nodes and a set of edges. The nodes often represent resources such as machines, employees, or plant locations. Each edge represents the relationship between a pair of nodes such as time, distance, or cost. Integer programs are frequently used to solve graphical problems. Unfortunately, IPs are NP-hard unless P = NP, which implies that it requires exponential effort to solve them. Much research has been focused on reducing t

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33

Wilson, Christopher Graeme McDonald. "Structure and stability studies of tendamistat : side chain packing at the protein surface." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621146.

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34

Agirtopcu, Yasin. "Investigations On The Permeability Of Acrylic Powder Structures." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/4/1045343/index.pdf.

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There are many examples where creation and usage of porous substrates play important roles in various fields of application in material science and technology. In the manufacture of ceramic products, as an alternative to the plaster molds, porous resin molds are used in order to resolve the drawbacks that result A porous substrate can be produced by various ways. In this study, porous polymeric matrices of poly(methyl methacrylate) (PMMA) and poly(methyl methacrylate-co-2-hydroxyethyl methacrylate) [poly(MMA-HEMA)] polymers were prepared by connecting the polymer microspheres to each other by

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35

Li, Zhen. "Chain-Packing and Chain-Folding Structures of Isotactic Polypropylene Characterized by Solid-State NMR." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1447115982.

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36

Melnyk, Anton [Verfasser]. "Relating chemical structure and molecular packing to charge transport in conjugated polymers / Anton Melnyk." Mainz : Universitätsbibliothek Mainz, 2017. http://d-nb.info/1133214800/34.

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37

Tsukruk, Vladimir, Nikolay Mischenko, Peter Köberle, and André Laschewsky. "The structural order of some novel ionic polymers; 2. : Models of molecular packing." Universität Potsdam, 1992. http://opus.kobv.de/ubp/volltexte/2009/1725/.

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The molecular packing and spatial correlations of two isomeric zwitterionic polymethacrylates and one polyacrylate analog are studied by means of X-ray analysis and conformational calculations. The analysis of the correlation functions and density distribution profiles suggest a double-layered molecular packing which is discussed for the three polymers investigated, with respect to their different chemical structures. Whereas the zwitterionic polymethacrylates studied exhibit liquid-like short-range order, the polyacrylate analog exhibits an ordered double-layered superstructure.

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38

Braun, Nils. "Dichte Packung durch Sechseckschichten eine Packungsanalyse der Cambridge Structural Database /." [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=97090228X.

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39

Chao, Chien-Wei. "An Improved Dynamic Particle Packing Model for Prediction of the Microstructure in Porous Electrodes." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5632.

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The goal of this work is to develop a model to predict the microstructure of Li-ion batteries, specifically focusing on the cathode component of the batteries. This kind of model has the potential to assist researchers and battery manufacturers who are trying to optimize the capacity, cycle life, and safety of batteries. Two dynamic particle packing (DPP) microstructure models were developed in this work. The first is the DPP1 model, which simulates the final or dried electrode structure by moving spherical particles under periodic boundaries using Newton's laws of motion. The experience deriv

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40

Dixit, Onkar. "Upgrading Biogas to Biomethane Using Absorption." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-189059.

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Questions that were answered in the dissertation: Which process is suitable to desulphurize biogas knowing that chemical absorption will be used to separate CO2? Which absorption solvent is suitable to separate CO2 from concentrated gases such as biogas at atmospheric pressure? What properties of the selected solvent, namely aqueous diglycolamine (DGA), are already known? How to determine solvent properties such as equilibrium CO2 solubility under absorption and desorption conditions using simple, but robust apparatuses? What values do solvent properties such as density, viscosity and surface

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41

Rabara, Taylor Renee. "Knob-socket Investigation of Stability and Specificity in Alpha-helical Secondary and Quaternary Packing Structure." Scholarly Commons, 2019. https://scholarlycommons.pacific.edu/uop_etds/3633.

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The novel knob-socket (KS) model provides a construct to interpret and analyze the direct contributions of amino acid residues to the stability in α-helical protein structures. Based on residue preferences derived from a set of protein structures, the KS construct characterizes intra- and inter-helical packing into regular patterns of simple motifs. The KS model was used in the de novo design of an α-helical homodimer, KSα1.1. Using site-directed mutagenesis, KSα1.1 point mutants were designed to selectively increase and decrease stability by relating KS propensities with changes to α-helical

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42

Chan, Shu-hei, and 陳樹禧. "Statistical distribution of forces in random packings of spheres and honeycomb structures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B29545365.

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43

Pannala, Sreemala. "Development of time domain characterization methods for packaging structures." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/16470.

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44

Garg, Nitin Kumar 1967. "Analysis domain truncation of interconnections in multilayer packaging structures." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277078.

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Interconnect lines, which connect components on a chip, can exhibit transmission line properties. Several factors like decrease in size of components, and decrease in spacing between interconnect lines, have contributed to the increase in importance of interconnect lines. A circuit-analysis approach that does not include the effect of these lines may be useless for highly dense chips. The presence of an active line does not require the analysis of all the other lines in a transmission-line system. In this thesis, a numerical experimental approach based on several industry-typical geometries is

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45

Nyflött, Åsa. "Structure-Performance Relations of Oxygen Barriers for Food Packaging." Doctoral thesis, Karlstads universitet, Institutionen för ingenjörs- och kemivetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-47496.

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Food packaging should ensure the safety and quality of food, minimize spoilage and provide an easy way of storing and handling it. Barrier coatings are generally used to meet the demands placed on fibre-based food packages, as these have the ability to regulate the amount of gases that can enter them. Some gases are detrimental to food quality: oxygen, for example, initiates lipid oxidation in fatty foods. Using both experimental data and computer modelling, this thesis explains some aspects of how the structure of barrier coatings influences the mass transport of oxygen with the aim of obtain

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46

Fang, Huaming. "Structure and Function Study of Phi29 DNA packaging motor." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1352488734.

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47

Joung, Yeun-Ho. "Electroplating bonding technology for chip interconnect, wafer level packaging and interconnect layer structures." Diss., Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04052004-180025/unrestricted/joung%5Fyeun-ho%5F200312%5Fphd.pdf.

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48

Dai, Xiang. "Materials study for interfacial adhesion and reliability of microelectronics packaging structures /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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49

Hayes, Janelle A. "The Mechanism and Regulation of Bacteriophage DNA Packaging Motors." eScholarship@UMMS, 2019. https://escholarship.umassmed.edu/gsbs_diss/1049.

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Many double-stranded DNA viruses use a packaging motor during maturation to recognize and transport genetic material into the capsid. In terminase motors, the TerS complex recognizes DNA, while the TerL motor packages the DNA into the capsid shell. Although there are several models for DNA recognition and translocation, how the motor components assemble and power DNA translocation is unknown. Using the thermophilic P74-26 bacteriophage model system, we discover that TerL uses a trans-activated ATP hydrolysis mechanism. Additionally, we identify critical residues for TerL ATP hydrolysis and DNA

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50

Duangphet, Sitthi. "Extrusion foaming of bioplastics for lightweight structure in food packaging." Thesis, Brunel University, 2012. http://bura.brunel.ac.uk/handle/2438/7350.

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This thesis reports the systematic approaches to overcome the key drawbacks of the pure PHBV, namely low crystallisation rate, tensile strength, ductility, melt viscosity, thermal stability and high materials cost. The physical, mechanical, thermal, and rheological properties of the pure PHBV were studied systematically first to lay a solid foundation for formulation development. The influence of blending with other biopolymers, inclusion of filler, and chain extender additives in terms of mechanical properties, rheology, thermal decomposition and crystallization kinetics were then followed. C

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