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Dissertations / Theses on the topic 'Gas Expanders'

Author: Grafiati

Published: 4 June 2021

Last updated: 28 July 2025

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1

Phung, Truong. "Design and modelling of the limaçon positive displacement gas expander." Thesis, Federation University Australia, 2017. http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/165481.

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The limaçon positive displacement technology has been featured in a number of patents over the last 100 years. The technology offers a two-lobe rotor that slides and rotates in a rounded cavity so as to create a pair of variable-volume chambers suited for fluid processing. As such, it can be employed to manufacture gas expanders to extract work from low-grade heat or other heat resources. Positive displacement gas expanders are applied to small-scale power generation plants which can be used for a number of applications such as to improve the energy efficiency of existing thermal processes. Th

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2

Wang, Wen-Bohr. "Optimization of expander plants /." Access abstract and link to full text, 1985. http://0-wwwlib.umi.com.library.utulsa.edu/dissertations/fullcit/8520757.

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3

Gohres, John Linton III. "Spectroscopic and computational investigations of molecular interactions in gas-expanded liquids." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24692.

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Thesis (Ph.D.)--Chemical Engineering, Georgia Institute of Technology, 2008.<br>Committee Chair: Charles A. Eckert; Committee Co-Chair: Charles L. Liotta; Committee Member: J. Carson Meredith; Committee Member: Rigoberto Hernandez; Committee Member: William J. Koros

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4

LOPES, PAULO ROBERTO PINTO. "USE OF EXPANDERS FOR GENERATING ELECTRICAL ENERGY IN NATURAL GAS PRESSURE REDUCTION STATIONS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2009. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=14604@1.

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O gás natural é comprimido para pressões elevadas para que possa ser transportado pelo gasoduto e distribuído aos clientes em pressões mais baixas, através de sua redução em válvulas de controle, num processo adiabático. A termodinâmica mostra que o mesmo estado de saída do gás natural poderia ser conseguido se as válvulas de controle puderem ser substituídas por expansores, gerando trabalho e, portanto, energia elétrica, e com transferência de calor obtida através da queima de combustível, que no caso é o próprio gás natural, para que sua temperatura permaneça a mesma. O investimento nos equi

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5

Wyatt, Victor T. "Characterization of gas-expanded liquids." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/26006.

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6

Spuller, Matthew Thomas. "Resist and Residue Removal Using Gas-Expanded Liquids." Diss., Available online, Georgia Institute of Technology, (2003), 2003. http://etd.gatech.edu/theses/available/etd-11072003-150305/.

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7

Maxey, Natalie Brimer. "Transport and Phase-Transfer Catalysis in Gas-Expanded Liquids." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10411.

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Gas-expanded liquids (GXL) are a new and benign class of liquid solvents that are intermediate in physical properties between normal liquids and supercritical fluids and therefore may offer advantages in separations, reactions, and advanced materials. Phase-transfer catalysis (PTC) is a powerful tool in chemistry that facilitates interaction and reaction between two or more species present in immiscible phases and offers the ability to eliminate the use of frequently expensive, environmentally undesirable, and difficult to remove polar, aprotic solvents. The work presented here seeks to furt

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8

Shukla, Charu L. "Computationally Probing the Cybotactic Region in Gas-Expanded Liquids." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14510.

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Gas-expanded liquids (GXLs) are novel and environmentally benign solvent systems with applications in reactions, separations, nanotechnology, drug delivery, and microelectronics. GXLs are liquid mixtures consisting of an organic solvent combined with a benign gas, such as CO2, in the nearcritical regime. In this work, molecular dynamics simulations have been combined with experimental techniques to elucidate the cybotactic region or local environment in gas-expanded liquids. Molecular dynamics simulations show clustering of methanol molecules in carbon dioxide-methanol mixtures. This cluster

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9

Janakat, Malina Elizabeth. "Synergistic Approach to Exploration of the Microstructure of Novel, Tunable Solvents for Reactions, Separations and Catalyst Recycle." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10461.

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Gas-expanded liquids (GXLs) are a new and benign class of pressure-tunable liquid solvents which show tremendous promise as the next sustainable processing medium. In order to realize the potential of GXLs fully, it is necessary to elucidate their cybotactic region and gain an understanding of where properties are different in the bulk and micro-scales and how local structure and order affect both reactions and separations. This work explores the cybotactic region of GXLs and probes the existence and implications of those differences. This study is started by exploring the cybotactic region

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10

Hill, Elizabeth M. "Benign Tunable Solvents for Improved Processing of Pharmaceutically Relevant Products and Catalysts." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16320.

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Sustainable technologies are vital to reducing the environmental impact of chemical enterprises. Solvents are often seen as just a medium in which a reaction takes place; however they can also play a dominant role in the overall toxicity of a typical pharmaceutical/fine chemicals batch chemical operation. Further, careful solvent selection for a reaction may also lead to more facile separation and purification of products, thus reducing the overall cost of a chemical process. This thesis presents an environmentally benign processing technique for sustainable biocatalytic reactions coupled w

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11

Paap, Scott M. "Size reduction and polymer encapsulation of carbon black in gas-expanded solvents." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/58269.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, February 2010.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>Ink jet printing is a demanding application that requires carefully formulated inks in order to quickly and reliably produce high-quality printed images. Although ink jet inks are currently produced via an aqueous process, supercritical fluids (SCF) and gas-expanded liquids (GXL) present alternative processing media for particle coating operations that may offer significant benefits with respect to the producti

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12

LO, CASCIO ERMANNO. "Energy management and guidelines to digitalisation of integrated natural gas distribution systems equipped with expander technology." Doctoral thesis, Università degli studi di Genova, 2019. http://hdl.handle.net/11567/942334.

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In a swirling dynamic interaction, digital innovation, environment and anthropological evolution are swiftly shaping the smart grid scenario. Integration and flexibility are the keywords in this emergent picture characterised by a low carbon footprint. Digitalisation, within the natural limits imposed by the thermodynamics, seems to offer excellent opportunities for these purposes. Of course, here starts a new challenge: how digital technologies should be employed to achieve these objectives? How would we ensure a digital retrofit does not lead to a carbon emission increase? In author o

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13

Morris, Noel Alexander. "An experimental and computational study of moderately under-expanded rocket exhaust plumes in a co-flowing hypersonic free stream." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282347.

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14

Štěpánek, Jindřich. "Technologie pro zkapalňování plynů a jeho využití a distribuce." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230571.

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This thesis deals with technologies for gas liquefaction and storage. The first section summarizes the development of liquefaction technology using expanders and throttling valves, followed by current technology. This is especially a rotary expanders. The storage technology is the above-ground storage of cryogenic tanks. The thesis includes proposals turbine wheels for liquefaction lines and included two proposals liquefaction cycles.

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15

Laxén, Jonas. "Possibilities and limitations of exhaust gas analysis for expanded use in control of an AOD-converter." Thesis, KTH, Tillämpad processmetallurgi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-103256.

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The main purpose of the AOD-converter is to lower the carbon content in stainless steel production. The carbon content can be estimated by static theoretical models. It can also be estimated through dynamic models based on analysis of the exhaust gases from the converter. This master thesis is a study on an extended use of exhaust gas analysis data on the AOD-converter at Outokumpu’s stainless steel plant in Avesta, Sweden. There are two main methods of predicting the carbon content based on exhaust gas analysis, mass balance and a linear regression between decarburization rate and carbon cont

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16

Chang, Chiehming James. "Recrystallization of organic compounds from supercritical fluids and high-pressure gas-expanded liquid solvents." Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/185083.

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The precipitation of organic particles from supercritical fluids (SF) by expansion (SFX) has become an interesting alternative to milling without thermal decomposition. Through the rapid-expansion process, a dramatic change of the solute supersaturation ratio is created causing subsequent precipitation with a narrow particle size distribution. It was found that β-carotene precipitates from SF ethylene and ethane have the feed material crystallinity. However, SF CO₂ reacted with β -carotene and did not give characteristic β -carotene X-ray spectra. The mean particle sizes of these precipitates

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17

Taylor, Donald Fulton. "Measurement of binary phase equilibria and ternary/quaternary gas antisolvent (GAS) system measurement and analysis." Thesis, Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-07112004-194307/unrestricted/taylor%5Fonald%5Ff%5F200407%5FMS.pdf.

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Thesis (M.S.)--School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 2005. Directed by Charles Eckert.<br>Charles Eckert, Committee Chair ; Amyn Teja, Committee Member ; Pete Ludovice, Committee Member. Includes bibliographical references.

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18

Song, Ingu. "Role of carbon dioxide in gas expanded liquids for removal of photoresist and etch residue." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/26473.

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Thesis (Ph.D)--Chemical Engineering, Georgia Institute of Technology, 2008.<br>Committee Chair: Hess, Dennis; Committee Member: Eckert, Charles; Committee Member: Frazier, Bruno; Committee Member: Henderson, Clifford; Committee Member: Liotta, Charles. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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19

Lazzaroni, Michael John. "Optimizing solvent selection for separation and reaction." Thesis, Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-07092004-124758/unrestricted/lazzaroni%5Fmichael%5Fj%5F200407%5Fphd.pdf.

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Thesis (Ph. D.)--School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 2005. Directed by Charles A. Eckert.<br>Charles L. Liotta, Committee Co-Chair ; Charles A. Eckert, Committee Chair ; Amyn S. Teja, Committee Member ; J. Carson Meredith, Committee Member ; Rigoberto Hernandez, Committee Member. Vita. Includes bibliographical references.

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20

Anand, Madhu. "Synthesis, fractionation, and thin filmp rocessing of nanoparticles using the tunable solvent properties of carbon dioxide gas expanded liquids." Auburn, Ala., 2007. http://repo.lib.auburn.edu/2007%20Spring%20Dissertations/ANAND_MADHU_59.pdf.

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21

St, John Amy Lynn. "The Impact of Expanded Access and Increased Engagement and the Effect on Closing the Achievement Gap." Thesis, Lindenwood University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10933878.

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<p> Considering instructional time is one of the most valuable and expensive resources in public education, there is nominal research examining the effectiveness of its use (Farbman, 2015). The purpose of this study was to determine the correlation between the amount of extended learning time provided to eligible students at least one grade level below in reading or mathematics and their scale score growth determined by middle-of-year results on the i-Ready Diagnostic Assessment. i-Ready Diagnostic Assessment results were examined of students who attended an extended learning time after-school

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22

Слободян, В. І. "Раціоннальне використання енергетичних ресурсів компресорних станцій магістральних газопроводів". Thesis, Івано-Франківський національний технічний університет нафти і газу, 2011. http://elar.nung.edu.ua/handle/123456789/1948.

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Дисертацію присвячено удосконаленню технологій експлуатації складних газотранспортних систем з багатоцеховими компресорними станціями з метою економії енерговитрат на транспортування газу і використання прихованих резервів виробничого процесу. Досліджено і проаналізовано квазістаціонарні режими роботи складних ГТС, в результаті встановлено необхідність регулювання режимів з метою зменшення енерговитрат, та виявлено пульсаційні процеси коливання тису на вході КС, досліджено вплив пульсацій тиску на втомну міцність технологічних трубопроводів КС. Проведено дослідження втрат енергії в умовах техн

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23

Kutschmann, Pia, Thomas Lindner, Kristian Börner, Ulrich Reese, and Thomas Lampke. "Effect of Adjusted Gas Nitriding Parameters on Microstructure and Wear Resistance of HVOF-Sprayed AISI 316L Coatings." MDPI AG, 2019. https://monarch.qucosa.de/id/qucosa%3A34775.

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Gas nitriding is known as a convenient process to improve the wear resistance of steel components. A precipitation-free hardening by low-temperature processes is established to retain the good corrosion resistance of stainless steel. In cases of thermal spray coatings, the interstitial solvation is achieved without an additional surface activation step. The open porosity permits the penetration of the donator media and leads to a structural diffusion. An inhomogeneous diffusion enrichment occurs at the single spray particle edges within the coating’s microstructure. A decreasing diffusion dept

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24

Fadhel, Ali Zuhair. "Designing for sustainability: applications of tunable solvents, switchable solvents, and catalysis to industrial processes." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39646.

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The focus of this research was to improve the sustainability of various processes by employing tunable solvents, switchable solvents, and catalysis. In Chapter 2, we report applications of tunable solvents to metal and enzyme catalyzed reactions of hydrophobic substrates. Tunable solvents are defined as solvent that change properties rapidly but continuously upon the application of an external physical stimulus and we utilize these solvents to couple homogeneous reactions with heterogeneous separations. We developed organic-aqueous tunable solvents that utilize propane for efficient phase sepa

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25

Nunes, Eduardo Raimundo Dias. "Influ?ncia da vermiculita expandida na formula??o de pastas leves para evitar a migra??o de g?s em cimenta??o de po?os petrol?feros." Universidade Federal do Rio Grande do Norte, 2014. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12855.

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Made available in DSpace on 2014-12-17T14:07:19Z (GMT). No. of bitstreams: 1 EduardoRDN_TESE.pdf: 2710171 bytes, checksum: 09b5f50c7446d0f076dc4edac8718d45 (MD5) Previous issue date: 2014-02-10<br>The gas migration during the cementing of wells is one of the main problems of oil wells engineering. Its occurrence can cause severe problems since shortly to loss of control of the well after cementation. Recently, 20/04/2010 In an accident of major proportions in the Gulf of Mexico, among other factors, faulty cementing operation provided the gas migration, causing the accident, in which 11 peop

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26

Ford, Jackson Walker. "Designing for sustainability with CO2-tunable solvents." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19866.

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Thesis (Ph.D)--Chemical Engineering, Georgia Institute of Technology, 2008.<br>Committee Chair: Dr. Charles A. Eckert; Committee Co-Chair: Dr. Charles L. Liotta; Committee Member: Dr. Amyn Teja; Committee Member: Dr. Dennis W. Hess; Committee Member: Dr. Victor Breedveld.

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27

Donaldson, Megan Elizabeth. "Development and application of novel solvents for sustainable reactions and separations." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24749.

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Thesis (Ph.D.)--Chemical Engineering, Georgia Institute of Technology, 2008.<br>Committee Chair: Charles A. Eckert; Committee Co-Chair: Charles L. Liotta; Committee Member: Christopher W. Jones; Committee Member: Facundo M. Fernandez; Committee Member: Thomas F. Fuller.

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28

Chen, Fang. "Modélisation d'un jet de gaz dans le collecteur sodium des échangeurs à plaques compacts sodium gaz des réacteurs nucléaires de la filière RNR-Na." Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0380.

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Cette thèse s’inscrit dans le projet d’ASTRID au CEA Cadarache. L’objectif de cette thèse est de développer un outil numérique capable de décrire finement la structure du jet de gaz sous-détendu dans du sodium en fonction du débit de la fuite de gaz. Dans un jet de gaz dans un liquide, il existe une couche de gouttelettes issues du liquide et une couche des bulles de gaz. Le modèle de Baer-Nunziato est alors choisi car c’est le modèle le plus adapté pour cette étude. De plus, la diffusion visqueuse, l’échange de quantité de mouvement entre les deux phases sont également pris en compte. Le modè

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29

Lindner, Thomas, Martin Löbel, and Thomas Lampke. "Phase Stability and Microstructure Evolution of Solution-Hardened 316L Powder Feedstock for Thermal Spraying." MDPI AG, 2018. https://monarch.qucosa.de/id/qucosa%3A33159.

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A solution-hardening of AISI 316L stainless-steel powder was conducted. The expansion of the crystal lattice and a strong increase in the nanoindentation hardness confirm the successful diffusion of carbon and nitrogen in the interstices. A multiphase state of the powder feedstock with phase fractions of the metastable S-phase (expanded austenite) mainly at the particle’s edge, and the initial austenitic phase within the core was found. Thermal spraying using high velocity oxy-fuel (HVOF) and atmospheric plasma spraying (APS) prove the sufficient thermal stability of the Sphase. Microstructura

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30

Granero-Fernandez, Emanuel. "Fluides supercritiques et solvants biosourcés : propriétés physicochimiques des systèmes expansés par du CO2." Thesis, Toulouse, INPT, 2018. http://oatao.univ-toulouse.fr/23928/1/Granero%20Fernandez_Emanuel.pdf.

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Les objectifs environnementaux (COP21) visant à réduire les émissions de gaz à effet de serre et l'impact de l'industrie sur la nature, font face au défi de la demande croissante d'énergie et de produits. Les procédés chimiques sont les premiers en cause lorsqu’ils mettent en œuvre des solvants. L'ingénierie des solvants est une solution innovante qui vise à trouver des milieux alternatifs bénins possédant les propriétés de solvant adaptés pour chaque étape du procédé.Dans cette perspective, nous avons étudié les Liquides expansés par un gaz (LEGs), qui sont desliquides dont le volume augmente

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31

Lin, Chong-wei, and 林崇瑋. "Use of expander to synthesize mesoporous adsorbents of different pore structure and their application for the CO2 greenhouse gas capture." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/39735606203354424096.

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碩士<br>國立交通大學<br>環境工程系所<br>99<br>The structure of mesoporous support is found to play a vital role in the performance of CO2 adsorption capacity, but literature data still show no conclusion yet. The purpose of this study is to expand the pore diameter and the pore volume of the MCM-41 base material via the use of pore expander. Then, the effect of different pore structures on the CO2 adsorption capacity and amine grafting will be discussed. In this study, the mesoporous material of MCM-41 is used as the substrate, and by adding the expansion agent of TMB (1,3,5-Trimethylbenzene) and changing t

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32

Van, Heerden Xandra. "The influence of three different intercalation methods on the properties of exfoliated graphite." Diss., 2015. http://hdl.handle.net/2263/46247.

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It is unclear whether all intercalation techniques truly lead to the insertion of atoms between the graphite layers, or also lead to other effects which contribute to expansion. The objective of this project is to better understand the effects caused by different intercalation methods. Three intercalation methods were explored to determine the method which incurs the least damage to the surface and microstructure of the graphite intercalated compounds, yet achieves the best intercalation and therefore expansion. All the main findings are summarised below:  The gas phase sample had vir

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33

Maseko, Kwena Nicholas. "Will the expanded audit report model proposed by IAASB reduce the expectation gap in South Africa?" Thesis, 2016. http://hdl.handle.net/10539/20005.

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In 2013 the International Auditing and Assurance Standards Board (IAASB) proposed the revision of the international auditing standard on the audit report (ISA 700) to meet the information needs of the users of audited financial statements. The purpose of this research was to investigate whether the International Standards Assurance and Accounting Board’s (IAASB) revised International Standard on Auditing (ISA 700) would reduce the expectation gap. It focused on the expectation gap investigation in three areas, namely: responsibilities of auditors, reliability of audited financial statements an

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Duarte, João Pedro Freire. "Análise das potencialidades de aplicação de matérias-primas secundárias radioativas." Master's thesis, 2014. http://hdl.handle.net/10316/38750.

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Dissertação de Mestrado Integrado em Engenharia do Ambiente apresentada à Faculdade de Ciências e Tecnologia da Universidade de Coimbra<br>A quantidade excessiva de resíduos radioativos presentes em escombreiras de antigas minas de urânio leva à necessidade de serem tratados e, posteriormente, aproveitados para diversas aplicações. O gás radão presente em materiais geológicos radioativos tende a fixar-se em espaços fechados e quando inalado pela população contribui para o desenvolvimento de neoplasias pulmonares. Em consequência, para se reutilizar estes materiais geológicos tem de se proceder

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Leshabane, Nompumelelo. "Development of selected sulphur compounds and oxygenated volatile organic compounds refernce gas mixtures for air quality monitoring." Diss., 2005. http://hdl.handle.net/10500/27315.

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Highly accurate analysis for the quantification of sulphur compounds and oxygenated volatile organic compounds are crucial for the adherence of the legislation in different environmental sectors. The sulphur compounds and oxygenated volatile organic compounds measurements are challenging, due to various factors such as molecules being adsorbed on the inner surfaces of cylinders. It is therefore important to produce accurate and reliable reference gas mixtures with mole fraction at ambient levels for the air quality monitoring and field of gas sensing in South Africa. The challeng

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Leshabane, Nompumelelo. "Development of selected sulphur compounds and oxygenated volatile organic compounds reference gas mixtures for air quality monitoring." Diss., 2020. http://hdl.handle.net/10500/27315.

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Highly accurate analysis for the quantification of sulphur compounds and oxygenated volatile organic compounds are crucial for the adherence of the legislation in different environmental sectors. The sulphur compounds and oxygenated volatile organic compounds measurements are challenging, due to various factors such as molecules being adsorbed on the inner surfaces of cylinders. It is therefore important to produce accurate and reliable reference gas mixtures with mole fraction at ambient levels for the air quality monitoring and field of gas sensing in South Africa. The challeng

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37

Seifried, Bernhard. "Physicochemical properties and microencapsulation process development for fish oil using supercritical carbon dioxide." Phd thesis, 2010. http://hdl.handle.net/10048/1139.

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Thesis (Ph.D.)--University of Alberta, 2010.<br>Title from PDF file main screen (viewed on July 29, 2010). A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Bioresource and Food Engineering, Department of Agricultural, Food and Nutritional Science, University of Alberta. Includes bibliographical references.

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