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Dissertations / Theses on the topic 'Gas channels'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 February 2022

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1

Tribbe, Christian. "Gas/liquid flow in cylindrical and corrugated channels." Thesis, University of Surrey, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244760.

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2

Wu, Xuemei. "Monte-Carlo modeling of turbulent dispersion of small particles in channels." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/17389.

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3

Goodwin, William A. "The characteristics of reduced-density channels in NH3-N2 gas mixtures." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/22941.

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A CO2 laser was used to generate reduced-density channels in various gas mixtures of ammonia and nitrogen. Interferometers were used to record the changing density resulting from the NH3 absorption of the CO2 laser radiation. One method used to determine the characteristics of the channel was based on the assumption that the resulting density profile was Gaussian shaped. The second method used the Abel Integral Transformation, requiring no pre-conditions on the density profile expect that it was cylindrically symmetric. While used extensively in plasma spectroscopy, this technique is not gener

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4

Dounia, Omar. "Numerical investigation of gas explosion phenomena in confined and obstructed channels." Phd thesis, Toulouse, INPT, 2018. http://oatao.univ-toulouse.fr/20584/1/DOUNIA_Omar.pdf.

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Mining, process and energy industries suffer from billions of dollars of worldwide losses every year due to Vapour Cloud Explosions (VCE). Moreover, explosion accidents are often tragic and lead to a high number of severe injuries and fatalities. The VCE scenario is complex and controlled by various mechanisms. The interplay among them is still not entirely understood. Understanding all these intricate processes is of vital importance and requires detailed experimental diagnostics. Coupling accurate numerical simulations to well documented experiments can allow an elaborate description of thes

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5

Sundberg, Jenny. "Heat Transfer Correlations for Gas Turbine Cooling." Thesis, Linköping University, Department of Mechanical Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-5446.

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<p>A first part of a ”Heat Transfer Handbook” about correlations for internal cooling of gas turbine vanes and blades has been created. The work is based on the cooling of vanes and blades 1 and 2 on different Siemens Gas Turbines. The cooling methods increase the heat transfer in the cooling channels by increasing the heat transfer coefficient and/or increasing the heat transfer surface area. The penalty paid for the increased heat transfer is higher pressure losses.</p><p>Three cooling methods, called rib turbulated cooling, matrix cooling and impingement cooling were investigated. Rib turbu

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6

Penache, Dan Lucius. "Heavy ion beam transport in laser initiated high current gas discharge channels." Phd thesis, [S.l.] : [s.n.], 2002. http://elib.tu-darmstadt.de/diss/000245.

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7

Khamaj, J. A. J. "An experimental study of heat transfer in the cooling channels of gas turbine rotor blades." Thesis, Swansea University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637783.

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This thesis presents an investigation of experimental research into the effect of rotation on the convective heat transfer mechanism inside the cooling channels of turbine rotor blades. These involved the selection of eleven different channel geometries and these have been designated alphabetically by the letters 'A' through 'K' respectively. These channels involve a collection of basic geometrical duct cross sectional shapes with the incorporation of ribbed surfaces. The leading and trailing edges of the duct are fitted with in-line or staggered ribs aligned at 30° to 45° to the central axis

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8

Siow, Erh Chang. "Numerical solution of a two-phase model for laminar film condensation of vapour-gas mixtures in channels." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ62848.pdf.

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9

Göhring, Michael [Verfasser]. "Numerical Investigation of Internal Two-Pass Gas Turbine Cooling Channels Under the Influence of Rotation / Michael Göhring." München : Verlag Dr. Hut, 2020. http://d-nb.info/1219470112/34.

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10

Liu, Yao-Hsien. "Heat transfer in leading and trailing edge cooling channels of the gas turbine blade under high rotation numbers." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3196.

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11

Lamont, Justin Andrew. "Heat Transfer in Stationary and Rotating Coolant Channels Using a Transient Liquid Crystal Technique." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/19192.

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Heat transfer inside rotating coolant channels have a significant impact in design of gas turbine airfoils and other rotating components such as generator windings. The effects of the Coriolis acceleration and centrifugal buoyancy have a significant impact on heat transfer behavior inside such rotating coolant channels due to the complex flow patterns of coolant. Detailed heat transfer knowledge greatly enhances the designers\' ability to validate numerical models of newly designed channels. A rotating experimental rig was designed and built to model scaled up coolant channels at speeds up t

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12

Yang, Lixia. "Local investigations of gas-liquid mass transfer around Taylor bubbles flowing in straight and meandering millimetric channels using a colorimetric method." Thesis, Toulouse, INSA, 2017. http://www.theses.fr/2017ISAT0027/document.

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Les réacteurs-échangeurs à plaques (HEX) sont une technologie clé en intensification des procédés. Cependant, la plupart des recherches existantes portant sur ce type d'équipement ont été réalisées dans le cas d’écoulements monophasiques. Pour les réactions gaz-liquide, peu d'études ont été conduites. Cette thèse a pour objectif d’étudier localement le transfert de matière gaz-liquide autour de bulles de Taylor en écoulement dans des canaux millimétriques droits et ondulés par une méthode dite colorimétrique. Ceci constitue une étape préliminaire indispensable avant la mise en œuvre de système

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13

Tyagi, Kartikeya. "Detailed Experimental Measurements of Heat Transfer Augmentation in Internal Channels Using a Thermochromic Liquid Crystal Technique." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/52990.

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Design of internal cooling channels for gas turbine blade is critical to system performance. To achieve maximum efficiency, i.e. maximum cooling with minimum coolant usage, intensive research is required to optimize heat transfer enhancement features. The present study aims at experimental and numerical investigation of two heat transfer augmentation techniques for internal cooling, viz. dimple and swirl induced jet impingement. Dimples are suitable candidates for high performance enhancement as they impose a low pressure drop penalty. The present study aims at experimentally measuring heat tr

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14

Miao, Sha Ph D. Massachusetts Institute of Technology. "Mechanistic study of slug formation and evolution in high-viscosity-liquid/High-density-gas multiphase flows in channels/pipes." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/118725.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2018.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 165-176).<br>Rapidly rising global energy demand coupled with dwindling conventional oil resources has pushed unconventional oil, such as heavy oil, to become one of the most important future energy resources. However, design and operation of pipelines to transport heavy-oil/gas flows have raised new challenges associated with remarkably different flow regime transitions compared to conventional low-viscosity-o

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15

Alrahmani, Mosab. "A numerical study on the effects of surface and geometry design on water behaviour in PEM fuel cell gas channels." Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/16245.

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Water management is a serious issue that affects the performance and durability of PEM fuel cells. It is known, from previous experimental investigations, that surface wettability has influence on water behaviour and fuel cell performance. This finding has lead researchers to develop numerical tools for further investigation of the liquid water behaviour in gas channels. The Volume-of-Fluid (VOF) method has been used in a wide range of studies for its advantage of showing the multi-phase interface in a Computational Fluid Dynamics (CFD) simulation to understand liquid water behaviour in gas ch

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16

Göhring, Michael [Verfasser], and Jens von [Akademischer Betreuer] Wolfersdorf. "Numerical investigation of internal two-pass gas turbine cooling channels under the influence of rotation / Michael Göhring ; Betreuer: Jens von Wolfersdorf." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2020. http://d-nb.info/1219905801/34.

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17

Duarte, Henrique Canto e. Castro Guerreiro. "High-resolution seismic reflection investigation of gas accumulation and seepage in the tidal channels of the Ria of Aveiro barrier lagoon (Portugal)." Doctoral thesis, Universidade de Aveiro, 2009. http://hdl.handle.net/10773/2752.

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Doutoramento em Geociências<br>O metano é um gás de estufa potente e uma importante fonte de energia. A importância global e impacto em zonas costeiras de acumulações e escape de gás metano são ainda pouco conhecidas. Esta tese investiga acumulações e escape de gás em canais de maré da Ria de Aveiro com dados de cinco campanhas de reflexão sísmica de alta resolução realizadas em 1986, 1999, 2002 e 2003. Estas incluem três campanhas de Chirp (RIAV99, RIAV02 e RIAV02A) e duas campanhas de Boomer (VOUGA86 e RIAV03). O processamento dos dados de navegação incluíram filtros de erros, correcções d

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18

Tran, Lucky. "Development of Full Surface Transient Thermochromic Liquid Crystal Technique for Internal Cooling Channels." Master's thesis, University of Central Florida, 2014. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/6371.

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Proper design of high performance industrial heat transfer equipment relies on accurate knowledge and prediction of the thermal boundary conditions. In order to enhance the overall gas turbine efficiency, advancements in cooling technology for gas turbines and related applications are continuously investigated to increase the turbine inlet temperature without compromising the durability of the materials used. For detailed design, local distributions are needed in addition to bulk quantities. Detailed local distributions require advanced experimental techniques whereas they are readily availab

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19

Larsson, David. "Gaskunders informationsbehov. : En studie i Stockholm Gas AB:s olika kundsegments behov av information och önskade informationskanaler." Thesis, KTH, Skolan för teknikvetenskap (SCI), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-93447.

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Stockholm Gas AB säljer i huvudsak två olika produkter. Den ena är stadsgas och den andra är fordonsgas. Båda produkterna skall på sikt i huvudsak ha biogas som råvara. I dagsläget är det dock så att stadsgasen till största delen består av naturgas blandad med luft.Stockholm Gas AB har genomgått stora förändringar och står inför nya. År 2011 togs ett stort steg i Stockholm Gas klimat- och miljöriktiga utveckling. Den tidigare stadsgasen baserad på lättbensin ersattes med en stadsgaskvalité bestående av naturgas och/eller biogas blandad med luft. Utöver denna förändring har Stockholm Gas också

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20

Oliveira, Bruna Gonçalves de. "Emissão de metano e microbiota funcional associadas a vinhaça de cana-de-açúcar em sistemas de armazenamento e transporte." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/11/11138/tde-13052015-160145/.

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Esta pesquisa teve como objetivo quantificar a emissão de metano (CH4) proveniente da vinhaça presente em diferentes sistemas de armazenamento e transporte e, adicionalmente, avaliar, por técnicas independentes de cultivo, a microbiota funcional relacionada à produção deste gás. Para atingir esta meta foram realizados três estudos complementares. O primeiro abordou a caracterização dos sistemas de armazenamento e transporte de vinhaça encontrados no Brasil baseado em um questionário aplicado às usinas produtoras de etanol. O segundo visou quantificar as emissões de CH4 em condições de campo pr

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21

Gomez, de Leija Rodrigo [Verfasser], and R. [Akademischer Betreuer] Stieglitz. "Measurement and qualification of the local heat transfer and pressure losses in high turbulent gas flows in channels with different artificial surface structures / Rodrigo Gomez de Leija ; Betreuer: R. Stieglitz." Karlsruhe : KIT-Bibliothek, 2018. http://d-nb.info/117235166X/34.

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22

Carter, Rachel C. "Submarine Channel Evolution Linked to Rising Salt Dome, Mississippi Canyon, Gulf of Mexico." ScholarWorks@UNO, 2015. http://scholarworks.uno.edu/td/2060.

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By examining halokinetics and channel evolution in a deep-water system, we investigate how submarine channel morphology is affected by changing seascape linked to diapirism. The study area is located in Mississippi Canyon, Gulf of Mexico (GOM), situated directly off the continental slope in a prominent salt dome region. Interactions of salt domes with submarine channels in the GOM are poorly documented. Utilizing 3D seismic data and seismic geomorphology techniques, a long-lived Plio-Pleistocene submarine channel system has been investigated to develop a relationship between variable phases of

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23

Carrara, Brent. "Air-Gap Covert Channels." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35103.

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A fresh perspective on covert channels is presented in this work. A new class, air-gap covert channels, is defined as an unintentional communication channel established between systems that are physically and electronically isolated from one another. A specific class of air-gap covert channel is studied in depth, out-of-band covert channels (OOB-CCs), which are defined as policy-breaking communication channels established between isolated, physically unmodified systems. It is shown that OOB-CCs can be categorized by the physical channel that they communicate over: acoustic, light, seismic, mag

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24

Pouliquen, Benoît. "Two phase, gas liquid flow through a vertical channel." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63182.

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25

Jerome, Tiphaine. "Stratégie(s) de diffusion volontaire d’informations sur les gaz à effet de serre : Le cas du Carbon Disclosure Project." Thesis, Jouy-en Josas, HEC, 2013. http://www.theses.fr/2013EHEC0010/document.

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Le réchauffement climatique représente un enjeu prégnant auquel les entreprises répondent, entre autres, par la diffusion volontaire d’informations sur leurs émissions de gaz à effet de serre (GES). Trois études empiriques, traitant pour chacune d’elle une dimension de la stratégie mise en place par les firmes à cet égard, sont menées. Elles sont toutes trois réalisées à partir du programme Carbon Disclosure Project. La première étude identifie deux étapes séquentielles conduisant à la diffusion d’informations sur les GES : la production puis la diffusion sélective. À partir d’un échantillon m

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26

Wang, Fei. "Gas-Solid Fluidization: ECVT Imaging and Mini-/Micro-Channel Flow." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1290390285.

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27

Banerjee, Arindam. "Statistically steady measurements of Rayleigh-Taylor mixing in a gas channel." Texas A&M University, 2006. http://hdl.handle.net/1969.1/4183.

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A novel gas channel experiment was constructed to study the development of high Atwood number Rayleigh-Taylor mixing. Two gas streams, one containing air and the other containing helium-air mixture, flow parallel to each other separated by a thin splitter plate. The streams meet at the end of a splitter plate leading to the formation of an unstable interface and of buoyancy driven mixing. This buoyancy driven mixing experiment allows for long data collection times, short transients and was statistically steady. The facility was designed to be capable of large Atwood number studies of ABtB ~ 0.

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28

Welsh, Susan A. "Hydrodynamic characteristics of countercurrent gas-pseudoplastic liquid two-phase channel flow." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/16923.

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29

Stinson, Michael J. "Interphase transfer processes in cocurrent two phase channel flow." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/17215.

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30

Shimoura, Susumu. "VARIOUS INTERMEDIATE CHANNELS IN 12C+12C→12C[g.s.]+α+8Be[g.s.] REACTION". 京都大学 (Kyoto University), 1986. http://hdl.handle.net/2433/212050.

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31

Zhou, Gang. "Relationship marketing strategies at distribution channel in gas appliance market in Guangdong." Thesis, University of Macau, 2000. http://umaclib3.umac.mo/record=b1636678.

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32

Tanaka, Futoshi. "Study on boiling heat transfer in narrow gap channels." Kyoto University, 2007. http://hdl.handle.net/2433/135594.

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Kyoto University (京都大学)<br>0048<br>新制・論文博士<br>博士(エネルギー科学)<br>乙第12068号<br>論エネ博第49号<br>新制||エネ||37(附属図書館)<br>UT51-2007-H623<br>京都大学大学院エネルギー科学研究科エネルギー基礎科学専攻<br>(主査)教授三島嘉一郎, 教授代谷誠治, 教授功刀資彰<br>学位規則第4条第2項該当

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33

APPASWAMY, ARAVIND C. "SIMULATION OF SHORT CHANNEL AlGaN/GaN HEMTs." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1109277211.

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34

Conteau, Delphine. "Développement d’outils pour l’étude des écoulements diphasiques dans les canaux d’une pile à combustible de type PEM." Thesis, Vandoeuvre-les-Nancy, INPL, 2011. http://www.theses.fr/2011INPL036N/document.

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Parmi les nombreuses problématiques liées à la PEMFC, l'eau est un point crucial car elle est à la fois indispensable et indésirable dans le coeur de pile. En effet, les flux gazeux qui alimentent le système en réactifs sont humidifiés pour que la membrane soit convenablement hydratée afin de faciliter le transport des protons de l'anode vers la cathode. Mais à cet apport initial vient s'ajouter l'eau produite par la réaction électrochimique. Des gouttes d'eau liquide peuvent alors se former dans les pores des couches actives et peuvent grossir jusqu'à boucher les canaux des plaques d'alimenta

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35

Krishnamurthy, Nagendra. "Investigation of Fouling in Wavy-Fin Exhaust Gas Recirculators." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/32012.

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This dissertation presents a detailed account of the study undertaken on the subject of fouling of Exhaust Gas Recirculator (EGR) coolers. The fouling process in EGR coolers is identified to be due to two primary reasons â deposition of fine soot particles and condensation of hydrocarbons known as dry soot and wet soot fouling, respectively. Several numerical simulations are performed to study the fouling process. Preliminary analysis of the particle forces for representative conditions reveal that drag, thermophoresis and Brownian forces are the significant transport mechanisms and among th

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36

Talbot, Krystle. "Zebrafish (Danio rerio) Aquaporin 1a as a Multi-functional Transporter of Water, CO2, and Ammonia." Thèse, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31076.

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Previous in vitro studies have demonstrated that AQP1, traditionally viewed as a water channel, also facilitates the passage of CO2 and ammonia across cell membranes. This thesis summarizes the first in vivo studies confirming a physiologically-relevant role for AQP1 in acid-base balance and nitrogenous waste excretion. Zebrafish embryos were microinjected with a translation-blocking morpholino oligonucleotide targeted to the zebrafish AQP1 paralog, AQP1a. Closed-system respirometry, total CO2 analysis, tritiated water fluxes and measurement of ammonia excretion were performed on larvae at

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37

Miller, Hennessy Felicia, and Hennessy Felicia Miller. "Assessment of Ephemeral Channel Cross-Section Morphology Following Pipeline Construction in Southern Arizona." Thesis, The University of Arizona, 2017. http://hdl.handle.net/10150/624133.

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Morphologic change of ephemeral stream cross-sections is a natural component of fluvial geomorphology but disruptions to natural erosion and deposition by anthropogenic disturbances has the potential for cascading impacts down the channel corridor. The proximal impact of a natural gas pipeline construction on ephemeral stream cross-section geometry in southern Arizona was evaluated from July 2014 (pre-construction) to July 2016 (two years post construction). Cross-sections at three locations (upstream the pipeline Right-Of-Way (ROW)), through the middle of the ROW, and downstream of the ROW) w

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38

Leung, Ho Wing. "Theoretical and numerical analysis of high-explosive channel detonation using real-gas models." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:8881/R/?func=dbin-jump-full&object_id=92306.

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Grünker, Ronny, Irena Senkovska, Ralf Biedermann, et al. "A highly porous flexible Metal–Organic Framework with corundum topology." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-138599.

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A flexible Metal–Organic Framework Zn4O(BenzTB)3/2 (DUT-13) was obtained by combination of a tetratopic linker and Zn4O6+ as connector. The material has a corundum topology and shows the highest pore volume among flexible MOFs<br>Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich

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40

Haapala, A. (Antti). "Paper machine white water treatment in channel flow:integration of passive deaeration and selective flotation." Doctoral thesis, Oulun yliopisto, 2010. http://urn.fi/urn:isbn:9789514263682.

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Abstract Gas removal from the papermaking process is currently a standard practice, whereas purification of the internal water circulation has become common only recently. Both unit processes have progressed greatly during recent decades and new concepts are constantly being developed. The aim of this thesis was to analyse the efficiency and applicability of a channel flow design introduced by Metso for passive white water deaeration and to study the dynamics of passive bubbly gas removal. In addition, separation of the detrimental process water components by selective flotation during deaerat

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41

Calvanese, Giordano. "Volumetric deep learning techniques in oil & gas exploration." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20556/.

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This work consisted in the study and application of volumetric Deep Learning (DL) approach to seismic data provided by Eni S.p.A., with an industrial utility perspective. After a series of fruitful meetings with the Upstream & Technical Services team, we clearly defined the final objective of this approach: the automatic search for geological structures such as turbidite channel-bases, as potential regions of interest for the Oil & Gas industry. Therefore, we defined a workflow based on the training of volumetric DL models over seismic horizons containing channel bases providing “windrose” in

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42

Ayash, Ahmed. "Counter-current gas-liquid contacting in a rotating spiral channel : experimental and theoretical study." Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/21622/.

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Controlled counter-current contacting between a gas and a liquid forms the basis for a wide range of chemical separation operations, including absorption, stripping and distillation. A radical technique based on the rotating of a spiral channel can achieve segregation of any two immiscible phases into two parallel layers, allowing for a detailed control of phase flow rates and phase layer thicknesses. This work experimentally and theoretically studied the mass transfer process of gas-liquid contacting in this novel contactor, aiming for understanding, evaluating and demonstrating its performan

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43

Lee, Jeongik. "Gas heat transfer in a heated vertical channel under deteriorated turbulent heat transfer regime." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/41296.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2007.<br>Includes bibliographical references (p. 283-289).<br>Passive cooling via natural circulation of gas after a loss of coolant (LOCA) accident is one of the major goals of the Gas-cooled Fast Reactor (GFR). Due to its high surface heat flux and low coolant velocities under natural circulation in post-LOCA scenarios, the capability of turbulent gas flow to remove heat from the GFR core can be impaired by either a buoyancy effect or an acceleration effect. These phenomena lead to a Deteriorate

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44

Slabaugh, Carson. "HEAT TRANSFER AUGMENTATION IN A NARROW RECTANGULAR DUCT WITH DIMPLES APPLIED TO A SINGLE WALL." Master's thesis, University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2172.

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Establishing a clean and renewable energy supply is the preeminent engineering challenge of our time. Turbines, in some form, are responsible for more than 98 percent of all electricity generated in the United State and 100 percent of commercial and military air transport. The operation of these engines is clearly responsible for significant consumption of hydrocarbon fuels and, in turn, emission of green house gases into the atmosphere. With such wide-scale implementation, it is understood that even the smallest increase in the operating efficiency of these machines can lead to enormous impro

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Choueiri, George H. "Experimental Investigations of Flow Development, Gap Instability and Gap Vortex Street Generation in Eccentric Annular Channels." Thèse, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31017.

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Isothermal flow development, gap instability, and gap vortex street generation in eccentric annular channels have been studied experimentally. A representative paradigm of a flow in a highly eccentric annular channel was examined for a channel having an inner-to-outer diameter ratio d/D = 0.50 and an eccentricity e = 0.8 for a Reynolds number Re = 7300. Observation of the flow development has identified three distinct regions: the entrance region, the fluctuation-growth region and the rapid-mixing region. Weak quasi-periodic velocity fluctuations were first detected in the downstream part of t

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Wu, Mo. "AlGaN/GaN Dual Channel HFETs and Realization of GaN Devices on different substrates." VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/403.

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GaN-based HFETs demonstrate ubiquitous high power and high frequency performance and attract tremendous research efforts. Even though significant advances have been achieved, there still exist some critical issues needed to be investigated and solved. In particular, high defect densities due to inhomogeneous growth and operation under high power conditions bring many unique problems which are not so critical in the conventional Si and GaAs materials systems. In order to reduce the defect density and heat dissipation of GaN-based HFETs, research work on the realization of GaN-based HFETs on bu

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Roclawski, Harald. "PIV Measurements of Channel Flow with Multiple Rib Arrangements." UKnowledge, 2001. http://uknowledge.uky.edu/gradschool_theses/303.

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A model of a gas turbine blade cooling channel equipped with turbulators and a backward facing step geometry was examined. Up to four turbulators oriented cross-stream and inclined 45° to the flow direction were mounted in the channel. The blockage ratio b/H of the turbulators and the height h/H of the backward facing step was 0:125 and 0:14 respectively. The number of turbulators as well as their size was varied. In a preliminary investigation, hot-wire and pressure measurements were taken for three different Reynolds numbers (5,000, 12,000, 18,000)in the center plane of the test section. Sub

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48

Achike, Francis Ifejika. "The cardiovascular responses to calcium channel blockers in rats subjected to blood gas/pH changes." Thesis, [Hong Kong] : University of Hong Kong, 1990. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12937095.

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Semeraro, Emanuele. "Experimental investigation on hydrodynamic phenomena associated with a sudden gas expansion in a narrow channel." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066516/document.

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La vaporisation rapide du sodium liquide surchauffé est supposée être à l’origine des arrêts automatiques pour réactivité négative du réacteur Phénix.Un dispositif expérimental a été mis en œuvre pour reproduire la détente d'un gaz pressurisé, repoussant un liquide dans un canal de section rectangulaire très allongée.L’interface qui sépare les deux fluides, initialement plate, ondule du fait d'instabilités de Rayleigh-Taylor dont le caractère 2D est garanti par le rapport d'aspect de la section du canal. L’aire interfaciale augmente d'un facteur 50.L’expansion du gaz peut être divisée en deux

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Gürkaynak, Frank Kağan. "GALS system design side channel attack secure cryptographic accelerators." Konstanz Hartung-Gorre, 2006. http://e-collection.ethbib.ethz.ch/ecol-pool/diss/fulltext/eth16351.pdf.

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