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Dissertations / Theses on the topic 'Gas/particle'

Author: Grafiati

Published: 9 March 2023

Last updated: 31 July 2025

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1

Strömgren, Tobias. "Modelling of turbulent gas-particle flow." Licentiate thesis, KTH, Mechanics, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4639.

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<p>An Eulerian-Eulerian model for dilute gas-particle turbulent flows is</p><p>developed for engineering applications. The aim is to understand the effect of particles on turbulent flows. The model is implemented in a finite element code which is used to perform numerical simulations. The feedback from the particles on the turbulence and the mean flow of the gas in a vertical channel flow is studied. In particular, the influence of the particle response time and particle volume fraction on the preferential concentration of the particles near the walls, caused by the turbophoretic effect is exp

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2

Strömgren, Tobias. "Modelling of turbulent gas-particle flow /." Stockholm : Mekanik, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4639.

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3

Götz, Christian Walter. "Gas-particle partitioning and particle-bound deposition of semivolatile organic chemicals /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17506.

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4

Zhang, Yonghao. "Particle-gas interactions in two-fluid models of gas-solid flows." Thesis, University of Aberdeen, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367375.

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Modelling gas-solid two-phase flows using a two-fluid approach has two main difficulties: formulating constitutive laws for the particulate stresses and modelling the gas turbulence modulation. Due to the complex nature of the gas-particle interactions, there is no universal model covering every flow regime. In this thesis, three flow regimes with distinctive characteristics are studied, i.e. the very dense regime where the solid volume fraction, <I>v</I><sub>2</sub>>5%, the dense flow regime where 5%≥1%, and the relatively dilute regime where 1%≥<I>v<sub>2</sub></I>>0.1%. In the very dense fl

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5

Choi, Moon Kyu Gavalas George R. Gavalas George R. "Particle shape effects on gas-solid reactions /." Diss., Pasadena, Calif. : California Institute of Technology, 1992. http://resolver.caltech.edu/CaltechETD:etd-07232007-152302.

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6

Strömgren, Tobias. "Model predictions of turbulent gas-particle shear flows." Doctoral thesis, KTH, Mekanik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12135.

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A turbulent two-phase flow model using kinetic theory of granularflows for the particle phase is developed and implmented in afinite element code. The model can be used for engineeringapplications. However, in this thesis it is used to investigateturbulent gas-particle flows through numerical simulations. The feedback from the particles on the turbulence and the meanflow of the gas in a vertical channel flow is studied. In particular,the influence of the particle response time, particle volumefraction and particle diameter on the preferential concentration ofthe particles near the walls, caus

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7

Mansoorzadeh, Shahriar. "Numerical modelling of gas particle fluidised bed dynamics." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313654.

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8

Slater, Shane Anthony. "Particle transport in laminar and turbulent gas flows." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624527.

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9

Forsyth, Peter. "High temperature particle deposition with gas turbine applications." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:61556237-feed-43cb-9f4a-d0aed00ca3f8.

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This thesis describes validated improvements in the modelling of micron-sized particle deposition within gas turbine engine secondary air systems. The initial aim of the research was to employ appropriate models of instantaneous turbulent flow behaviour to RANS CFD simulations, allowing the trajectory of solid particulates in the flow to be accurately predicted. Following critical assessment of turbophoretic models, the continuous random walk (CRW) model was chosen to predict instantaneous fluid fluctuating velocities. Particle flow, characterised by non-dimensional deposition velocity and par

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10

Swar, Rohan. "Particle Erosion of Gas Turbine Thermal Barrier Coating." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1259075518.

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11

Vicente, Ana Margarida Proença. "Characterisation of gas and particle emissions from wildfires." Doctoral thesis, Universidade de Aveiro, 2012. http://hdl.handle.net/10773/10424.

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Doutoramento em Ciências e Engenharia do Ambiente<br>Os incêndios florestais são uma importante fonte de emissão de compostos gasosos e de aerossóis. Em Portugal, onde a maioria dos incêndios ocorre no norte e centro do país, os incêndios destroem todos os anos milhares de hectares, com importantes perdas em termos económicos, de vidas humanas e qualidade ambiental. As emissões podem alterar consideravelmente a química da atmosfera, degradar a qualidade do ar e alterar o clima. Contudo, a informação sobre as caraterísticas das emissões dos incêndios florestais nos países do Mediterrâneo é limi

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12

Kämpfer, Burkhard, and G. G: Bunatian. "Quasi-particle description of a strongly interacting pion gas." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-32532.

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13

Tandya, Andrian Chemical Sciences &amp Engineering Faculty of Engineering UNSW. "Dense gas particle processing for alternative drug delivery formulations." Awarded by:University of New South Wales. School of Chemical Sciences and Engineering, 2006. http://handle.unsw.edu.au/1959.4/25480.

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Pulmonary and oral drug administrations are usually the preferred methods of delivery of active pharmaceutical ingredients.Generally,pulmonary drug formulations are more attractive compared to oral formulations since they consist of micron-sized powders with high surface area thus having faster onset of action,as well as minimizing the drug dosage and side effects.Oral insulin formulations,if achievable,would provide an alternative to injectable insulin,as the common drawbacks of injectable insulin are the multiple daily injections and the possibility of skin infections at the injection site.

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14

Yan, Fusheng Wood P. E. "Numerical study on turbulence modulation in gas-particle flows." *McMaster only, 2006.

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15

Hollis, David. "Particle image velocimetry in gas turbine combustor flow fields." Thesis, Loughborough University, 2004. https://dspace.lboro.ac.uk/2134/7640.

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Current and future legislation demands ever decreasing levels of pollution from gas turbine engines, and with combustor performance playing a critical role in resultant emissions, a need exists to develop a greater appreciation of the fundamental causes of unsteadiness. Particle Image Velocimetry (PIV) provides a platform to enable such investigations. This thesis presents the development of PIV measurement methodologies for highly turbulent flows. An appraisal of these techniques applied to gas turbine combustors is then given, finally allowing a description of the increased understanding of

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16

Quinlan, Nathan J. "Gas and particle dynamics in transdermal powdered drug delivery." Thesis, University of Oxford, 1999. http://ora.ox.ac.uk/objects/uuid:f6a9a058-911a-43c5-bc19-95dc866543df.

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Transdermal powdered drug delivery is an emerging technology for the injection of drugs through human skin, in which particles of solid drug are entrained in a high-speed gas flow and directed towards the skin at a high enough velocity to penetrate the outer layer of dead cells. Hand-held devices based on this idea offer a means of safe, painless and effective delivery of many drugs and vaccines. This thesis describes a programme of research into the fluid dynamics which determine the particle velocity distribution, the most important mechanical characteristic of the system, in prototype drug

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17

Dial, Oliver Eugene III. "Single particle spectrum of the two dimensional electron gas." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/45158.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2007.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Includes bibliographical references (p. 251-265).<br>Accurate spectroscopy has driven advances in chemistry, materials science, and physics. However, despite their importance in the study of highly correlated systems, two-dimensional systems (2DES) have proven difficult to probe spectroscopically. Typical energy scales are on the order of a millielectron volt (meV)

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18

Gerber, William B. (William Brian) 1974. "Investigation of windowless gas target system for particle accelerators." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50486.

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19

Kämpfer, Burkhard, and G. G: Bunatian. "Quasi-particle description of a strongly interacting pion gas." Forschungszentrum Rossendorf, 1993. https://hzdr.qucosa.de/id/qucosa%3A22080.

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20

Weber, Götz Mathias. "Hadronic gas models in particle production and phase transitions." Master's thesis, University of Cape Town, 1992. http://hdl.handle.net/11427/22004.

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In this work the methods of exact quantum number conservation in statistical mechanics are discussed and applied to the field of high energy nucleus-nucleus collisions. Various types of hadronic gas models are discussed as well as their merits and restrictions. Attempts to construct a phenomenological equation of state for nuclear matter are discussed in the context of the phase transition from hadronic matter to the quark-gluon plasma (QGP).

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21

GASBARRI, GIULIO. "Collisional Models for a Quantum Particle in a Gas." Doctoral thesis, Università degli Studi di Trieste, 2017. http://hdl.handle.net/11368/2908107.

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In the last decades important steps has been made to understand the quantum behaviour of a test particle in a gas. However the most refined theoretical collisional models proposed so far seem not to be in agreement with each other. The open dabate about which model is the one that correctly describes a particle in a gas is a witness that the validity of these models is still unclear. A better understanding of the quantum behavior of a test particle in a gas is not only desirable, but would also help in understanding the non-classical process of decoherence, which is believed to be of crucial i

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22

Cerminara, Matteo. "Modeling dispersed gas-particle turbulence in volcanic ash plumes." Doctoral thesis, Scuola Normale Superiore, 2016. http://hdl.handle.net/11384/86206.

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This PhD thesis focuses on numerical and analytical methods for simulating the dynamics of volcanic ash plumes. The study starts from the fundamental balance laws for a multiphase gas– particle mixture, reviewing the existing models and developing a new set of Partial Diﬀerential Equations (PDEs), well suited for modeling multiphase dispersed turbulence. In particular, a new model generalizing the equilibrium–Eulerian model to two-way coupled compressible ﬂows is developed. The PDEs associated to the four-way Eulerian-Eulerian model is studied, investigating the existence of weak solutions ful

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23

Tian, Zhaofeng, and rmit tian@gmail com. "Numerical Modelling of Turbulent Gas-Particle Flow and Its Applications." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080528.150211.

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The aim of this thesis is three-fold: i) to investigate the performance of both the Eulerian-Lagrangian model and the Eulerian-Eulerian model to simulate the turbulent gas-particle flow; ii) to investigate the indoor airflows and contaminant particle flows using the Eulerian-Lagrangian model; iii) to develop and validate particle-wall collision models and a wall roughness model for the Eulerian-Lagrangian model and to utilize these models to investigate the effects of wall roughness on the particle flows. Firstly, the Eulerian-Lagrangian model in the software package FLUENT (FLUENT Inc.)

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24

Liu, Xue. "Instability and segregation in bounded gas-particle and granular flows." Saarbrücken VDM Verlag Dr. Müller, 2006. http://d-nb.info/988937298/04.

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25

Liu, Xue. "Instability and segregation in bounded gas-particle and granular flows /." Saarbrücken : VDM Verlag Dr. Müller, 2008. http://d-nb.info/988937298/04.

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26

Tan, S. C. "A Study of Particle Trajectories In A Gas Turbine Intake." Thesis, Cranfield University, 1988. http://dspace.lib.cranfield.ac.uk/handle/1826/4622.

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An experimental and theoretical study of the particle trajectories in a gas turbine intake has been presented. computer model was written to simulate a particle behaviour flight in a theoretical flow which was assumed to inviscid, irrotational and incompressible. The model is also on other assumptions which imposes several limitations the accuracy of the predicted results. These limitations the objectives of the experimental investigation of particle trajectories which was carried out in a 30.0 section of an axisymmetric helicopter inertial separator. The separator section was fully instrument

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27

Gowin, Richard Lionel. "A multi-element gas-hybrid array for charged particle spectroscopy." Thesis, University of York, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245871.

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28

Smith, Christopher Stephen. "Experimental Validation of a Hot Gas Turbine Particle Deposition Facility." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1269547595.

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29

Barton, David Alan. "Particle Discrimination Using a High-Pressure Xenon Gas Scintillation Detector." Diss., Temple University Libraries, 2012. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/179369.

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Physics<br>Ph.D.<br>This work presents results on the study of the scintillation of high-pressure Xenon gas irradiated by various sources. Noble gases such as Xenon give off characteristic scintillation light when irradiated. The goal of the study was to develop a characteristic based on the scintillation time response of Xenon gas that would reliably discriminate between events from different types of primary radiation (neutron or gamma). A reliable discrimination characteristic would enable the development of room temperature, gas phase detectors for use in the search for Galactic Dark Matte

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30

Tsui, Chak M. "A computational model for gas-particle flows with distributed phase interfaces." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ28819.pdf.

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31

Hodgson, Sarah M. "Turbulence modulation in gas-particle flows, a comparison of selected models." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0003/MQ46074.pdf.

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32

Bishop, Jack Edward. "Experimental investigation of alpha-gas states using high-multiplicity particle spectroscopy." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8347/.

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The onset of a new state of matter in the nucleus, whereby the system can be described as a dilute gas of α-particles, represents a fantastic probe of the nuclear force. The observables from such an α-gas state are discussed here in tandem with a discussion of traditional α-cluster structure. An experiment, utilising a high energy compound nucleus reaction to study the ¹²C(¹⁶O,7α) reaction was performed at LNS Catania to search for the signatures of such a state of matter. Direct evidence of near-threshold α-gas states was found to be impeded by the effect of the Coulomb barrier. The break-up

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33

Dudek, David Robert. "Single particle, high temperature, gas-solid reactions in an electrodynamic balance." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/39089.

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34

Naylor, Michael J. "Fluid flow and particle size in gas atomization for fine powders." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/47415.

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35

Asbach, Christof. "Development and evaluation of a highly effective gas particle partitioner with minimal effect on the gas composition." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=970791429.

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36

Healy, David Patrick. "On the full Lagrangian approach and thermophoretic deposition in gas-particle flows." Thesis, University of Cambridge, 2003. https://www.repository.cam.ac.uk/handle/1810/219497.

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Theoretical and experimental studies of particle deposition in turbulent pipe flow have been carried out for over forty years, but some of the most important transport mechanisms are still not well understood. The first part of this thesis is concerned with the calculation of particle density when using Lagrangian methods to predict inertial particle transport in two-dimensional laminar fluid flows. Traditionally, Lagrangian calculations involve integrating the particle equations of motion along particle pathlines, and the particle density is obtained by applying a statistical averaging proced

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37

Bell, Robyn Anne, and Robyn Bell@csiro au. "Numerical modelling of multi-particle flows in bubbling gas-solid fluidised beds." Swinburne University of Technology, 2000. http://adt.lib.swin.edu.au./public/adt-VSWT20050902.132803.

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In Victoria, Australia, brown coal is utilised as a major source of energy for the power generation industry. Victorian and South Australian brown coals have a very high moisture content and therefore, the efficiencies of power generation in traditional pulverised fuel fired furnaces are low. Fluidised beds offer a number of advantages over conventional furnaces, leading to improvements in efficiency and environmental impact. A disadvantage with implementing fluidised bed technology is the issue of scale-up. Fluidised bed behaviour can alter significantly with changes in scale, because of thei

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38

Salama, I. M. "High temperature particle -to-metal interaction in a simulated gas turbine environment." Thesis, Cranfield University, 2002. http://dspace.lib.cranfield.ac.uk/handle/1826/4610.

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An experimental study of the particle-to-metal interaction during high temperatures and velocity impact conditions is presented. A novel continuous erosion testing facility have been used to study the effect of particle and metal target temperatures as well as impact particle velocity on the erosion/deposition behaviour of the stainless steel 321, Nimonic 75, and aluminium target materials. The study was carried out to provide database information on the behaviour of those metals under simulated gas turbine conditions. The erosive particles used were quartz sand with diameters ranging from 20-

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39

Woiski, Emanuel Rocha. "Solutions of the kinetic coagulation equation and predictions for gas-particle flow." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47310.

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40

Jia, Wenhan Jia. "Simulation of Heat Transfer with Gas-liquid Coexistence Using Dissipative Particle Dynammics." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1471346931.

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41

Moon, Chi Young. "Particle Sensing in Gas Turbine Inlets Using Optical Measurements and Machine Learning." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/101969.

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Propulsion systems are exposed to a variety of foreign objects that can significantly damage or impact their performance. These threats can range from severe dangers such as sandstorms and volcanic eruptions, which can induce engine failure in minutes, to condensation and moisture during ground tests that can negatively impact the engine's fuel efficiency. While numerous computational and experimental studies have investigated the effects of particle ingestion on the component level, an accurate in-situ measurement technique is needed for a systematic understanding of the effects and real-time

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42

De, Vos Wouter Phillip. "The effect of particle shape on solid entrainment in gas-solid fluidisation." Diss., Pretoria : [s.n.], 2008. http://upetd.up.ac.za/thesis/available/etd-08282008-144243/.

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43

Zhang, Ming. "Optical measurement of ash particle size and velocity in gas-solid flow." Morgantown, W. Va. : [West Virginia University Libraries], 2004. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=3462.

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Thesis (M.S.)--West Virginia University, 2004.<br>Title from document title page. Document formatted into pages; contains x, 98 p. : ill. (some col.) + 1 video file. Includes a video file (29 sec.). Includes abstract. Includes bibliographical references (p. 91-92).

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44

Plewacki, Nicholas. "Modeling High Temperature Deposition in Gas Turbines." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587714424017527.

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45

Mathisen, Anette. "An Experimental and Computational Investigation of Gas/Particle Flow in a Vertical Lifter." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-11267.

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Experimental and computational investigations of dilute gas/particle flow in a vertical lifter are performed. The effect of superficial gas velocity, particle density, particle size distribution and particle loading on particle velocities, particle fluctuations and particle cross-moment have been studied experimentally using laser Doppler anemometry (LDA) and particle image velocimetry (PIV). The results from the experimental investigation is compared with the computational investigation using FluentR. The experimental measurements are performed on a lab-scale vertical lifter, consisting of a

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46

Wang, Jing 1976. "An integrated performance model for high temperature gas cooled reactor coated particle fuel." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28368.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 2004.<br>Includes bibliographical references (p. 290-300).<br>The performance of coated fuel particles is essential for the development and deployment of High Temperature Gas Reactor (HTGR) systems for future power generation. Fuel performance modeling is indispensable for understanding the physical behavior of fuel particles and achieving their high reliability during operations and accidents through a guided design process. This thesis develops an integrated fuel performance model of coated particle fuel to

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47

Storey, John Morse Elliot. "Gas/particle partitioning of semi-volatile organic compounds to model atmospheric particulate material /." Full text open access at:, 1993. http://content.ohsu.edu/u?/etd,647.

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48

Xu, Hua. "Quenching of particle-gas combustible mixtures using the electric particulate suspension (EPS) method." [Ames, Iowa : Iowa State University], 2008.

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49

Melchiori, Tommaso. "Study of non catalytic gas-solid reactions: development of a single particle model." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3423565.

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This thesis investigates single particle models to describe non catalytic gas-solid reactions. A comparative study was made between the traditional shrinking core model and more detailed continuous models, involving the solution of microscopic balances for the solid and gas phases inside a single porous particle. Such a study proved that in some cases the use of the shrinking core model can lead to severe errors in the prediction of conversion, and that kinetic parameters in SCM are affected by the particle size. Different diffusion models were tested for the continuous model, and the inaccura

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50

Kuruneru, Sahan Trushad Wickramasooriya. "A coupled finite-volume & discrete-element method to investigate particle-laden gas flows and particle deposition in metal foam heat exchangers." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/125485/1/Sahan_Kuruneru_Thesis.pdf.

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This thesis focuses on the development and implementation of an advanced numerical model to investigate complex fluid flow behaviour through novel metal foam heat exchangers used in various industrial applications such as computer heat sinks and air-conditioners. The developed numerical model permits engineers to better optimize heat exchanger designs. Moreover, the project delves into heat exchanger fouling which is a multifaceted issue in the industry. In this regard, a non-toxic and cost-effective anti-fouling heat exchanger fouling is proposed.

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