Дисертації з теми "Fuel drop"
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Auliano, Manuel. "Investigation and validation of void and pressure drop correlations in BWR fuel assemblies." Thesis, KTH, Fysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-169548.
Повний текст джерелаSchroll, Cynthia A. "Spectroelectrochemical Real-Time Monitoring of f-block Elements during Nuclear Fuel Reprocessing." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1367926766.
Повний текст джерелаSingh, Sandeep. "Thermo-mechanical Behavior of Glass Based Seals for Solid Oxide Fuel Cells." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1288379341.
Повний текст джерелаCouval, Romain. "Scale up of a test fluid for testing the fuel system robustness against soft particles in biodiesels." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-85745.
Повний текст джерелаHill, Theresa Y. "Understanding Drop-on-Demand Inkjet Process Characteristics in the Application of Printing Micro Solid Oxide Fuel Cells." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright156167105938597.
Повний текст джерелаHammill, Matthew. "Ignition delay of oxygenated fuel droplets : development of a 1 second drop tower and initial 1-g test results /." Full text available online, 2006. http://www.lib.rowan.edu/find/theses.
Повний текст джерелаGunarathne, Duleeka. "Advanced Gasification of Biomass/Waste for Substitution of Fossil Fuels in Steel Industry Heat Treatment Furnaces." Doctoral thesis, KTH, Materialvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-190938.
Повний текст джерелаQC 20160825
Russi, Luigi. "modeling the pressure drop and thermal profile of a novel solid oxide fuel cell stack design with a homogenized approach." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
Знайти повний текст джерелаLaesecke, Jan. "Production and characterization of biomass fast pyrolysis oil blends for combustion testing as drop-in fuel alternatives in a single cylinder diesel engine." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/60409.
Повний текст джерелаApplied Science, Faculty of
Graduate
Cao, Liu. "Corrosion and Stress Corrosion Cracking of Carbon Steel in Simulated Fuel Grade Ethanol." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1345141634.
Повний текст джерелаCASTRO, ALFREDO J. A. de. "Análise experimental de velocidade crítica em elemento combustível tipo placa plana para reatores nucleares de pesquisa." reponame:Repositório Institucional do IPEN, 2017. http://repositorio.ipen.br:8080/xmlui/handle/123456789/28022.
Повний текст джерелаMade available in DSpace on 2017-11-17T17:27:31Z (GMT). No. of bitstreams: 0
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Os elementos de combustível de um reator nuclear de pesquisa tipo MTR (\"Material Testing Reactor\") são, em sua grande maioria, formados por placas de combustível revestidas com alumínio contendo no cerne silicileto de urânio (U3Si2) disperso em matriz de alumínio. Essas placas possuem espessura da ordem de milímetros e comprimentos muito maiores em relação à sua espessura. Elas são dispostas paralelamente no conjunto que forma o elemento combustível, de maneira a formar canais entre elas com poucos milímetros de espessura, por onde escoa o fluido de refrigeração (água leve ou água pesada). Essa configuração, associada à necessidade de um escoamento com altas vazões para garantir o resfriamento das placas em operação, pode gerar problemas de falhas mecânicas das placas de combustível devido às vibrações induzidas pelo escoamento nos canais e, consequentemente, acidentes de proporções graves no caso de velocidade crítica que possa gerar o colapso das placas. Embora não haja ruptura das placas de combustível durante o colapso, as deflexões permanentes excessivas das placas podem causar bloqueio do canal de escoamento no núcleo do reator e levar ao superaquecimento nas placas. Para este trabalho, foram desenvolvidas uma bancada experimental com capacidade para altas vazões volumétricas (Q=100 m3/h) e uma seção de testes que simula um elemento combustível do tipo placa com três canais de resfriamento. A seção de testes foi construída com placas de alumínio e acrílico e foi instrumentada com sensores de deformação, sensores de pressão, um acelerômetro e um tubo de pitot. As dimensões da seção de testes foram baseadas nas dimensões do Elemento Combustível do Reator Multipropósito Brasileiro (RMB), cujo projeto está sendo coordenado pela Comissão Nacional de Energia Nuclear - CNEN. Os experimentos realizados alcançaram o objetivo de chegar à condição de velocidade crítica de Miller com o colapso das placas. A velocidade crítica foi atingida com 14,5 m/s levando a consequente deformação plástica das placas que formam o canal do escoamento. O canal central na entrada da seção de testes apresentou uma abertura de 3 mm em seu centro, causando um grande bloqueio do escoamento nos canais laterais. Este comportamento foi v constatado visualmente durante a desmontagem da seção de testes, ilustrado e discutido na análise de resultados apresentado neste trabalho. O bloqueio dos canais também foi observado por meio de gráficos de queda de pressão e por gráficos das deformações da entrada, centro e saída das placas contra a velocidade média da seção de testes. Observou-se uma queda da resistência hidráulica da seção de testes devido ao aumento da seção transversal de escoamento no canal central e um aumento exponencial das deformações quando da ocorrência da velocidade crítica. Comparativamente, o valor experimental obtido para velocidade crítica na seção de testes foi da ordem de 85% do valor obtido por cálculo com a expressão teórica de Miller. Os experimentos realizados permitiram um melhor entendimento da interação fluido estrutura em elementos de combustível tipo placa como: valores de frequências de vibrações naturais, instabilidade fluido elástica e desenvolvimento de técnicas para a detecção de valores de velocidade crítica.
Tese (Doutorado em Tecnologia Nuclear)
IPEN/T
Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP
CNPq:481193/2012-0
Ahmed, Aqeel. "LES of atomization and cavitation for fuel injectors." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMR048/document.
Повний текст джерелаThis thesis presents Large Eddy Simulation (LES) of fuel injection, atomization and cavitation inside the fuel injector for applications related to internal combustion engines. For atomization modeling, Eulerian Lagrangian Spray Atomization (ELSA) model is used. The model solves for volume fraction of liquid fuel as well as liquid-gas interface surface density to describe the complete atomization process. In this thesis, flow inside the injector is also considered for subsequent study of atomization. The study presents the application of ELSA model to a typical diesel injector, both in the context of RANS and LES. The model is validated with the help of experimental data available from Engine Combustion Network (ECN). The ELSA model which is normally designed for diffused (unresolved) interfaces, where the exact location of the liquid-gas interface is not considered, is extended to work with Volume of Fluid (VOF) type formulation of two phase flow, where interface is explicitly resolved. The coupling is achieved with the help of Interface Resolution Quality (IRQ) criteria, that takes into account both the interface curvature and modeled amount of interface surface. ELSA model is developed first considering both phases as incompressible, the extension to compressible phase is also briefly studied in this thesis, resulting in compressible ELSA formulation that takes into account varying density in each phase. In collaboration with Imperial College London, the Probability Density Function (PDF) formulation with Stochastic Fields is also explored to study atomization. In modern fuel injection systems, quite oftenthe local pressure inside the injector falls below the vapor saturation pressure of the fuel, resulting in cavitation. Cavitation effects the external flow and spray formulation. Thus, a procedure is required to study the phase change as well as jet formulation using a single and consistent numerical setup. A method is developed in this thesis that couples the phase change inside the injector to the external jet atomization. This is achieved using the volume of fluid formulation where the interface is considered between liquid and gas; gas consists of both the vapor and non condensible ambient air
Canterle, Joseane Ortiz Breitenbach. "Avaliação da tenacidade à fratura do aço API 5L X70 em diferentes meios de etanol." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/114982.
Повний текст джерелаIn recent years, there have been significant increases in ethanol production due to Brazilian Alcohol Program (Proálcool) implementation, Kyoto Protocol and replacement MBTE in some countries. The world’s largest producers of ethanol are United States and Brazil, being produced from Corn and Sugar Cane, correspondingly. Pipeline transportation is the most cost effective in large volumes, although, there are evidences that these pipelines and the bottom of ethanol storage tanks might be susceptible to the stress corrosion cracking phenomenon. This phenomenon can be assessed, for example, by slow strain rate tests (SSRT) and fracture toughness tests, with specimens well defined by international standards. This study aims to evaluate the susceptibility of steel API X70 in different ethanol environment (Simulated fuel-grade ethanol (SFGE), Corn and Sugar Cane) through fracture mechanics specimens. The tests were carried out on pre-cracked C(T) (Compact Tension) specimens, according to ASTM E647-08. The analysis of results was performed using linear elastic fracture mechanics equations. The analysis of K-R curves initially presented a decrease in toughness only in Corn environment, however the K for crack initiation apparent and fractography investigation confirm the material embrittlement in both SFGE and Corn ethanol environments. Tests of the slow strain rate test (SSRT) interrupted and loading step with fluctuating load also confirm these results.
Abdel, Alim Richard. "Formation of Soft Particles in Drop-in Fuels." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231462.
Повний текст джерелаMujahid, Raqibul I. "Evaporation of liquid fuel droplet." abstract and full text PDF (UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1460767.
Повний текст джерелаCaraghiaur, Diana. "On drops and turbulence in nuclear fuel assemblies of Boiling Water Reactors." Doctoral thesis, KTH, Reaktorteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-107115.
Повний текст джерелаQC 20121207
Broukal, Jakub. "Effervescent Breakup and Combustion of Liquid Fuels: Experiment and Modelling." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-234230.
Повний текст джерелаValencia, Bejarano Maritza. "Experimental investigation of droplet coalescence in a poly-disperse full-cone spray." Thesis, The University of Sydney, 2003. https://hdl.handle.net/2123/27907.
Повний текст джерелаVarady, Mark Jordan. "Fuel reformation and hydrogen generation in direct droplet impingement reactors." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/42826.
Повний текст джерелаHarizi, Hedi [Verfasser]. "Full Chip Dynamic Voltage Drop Analysis Using Automated Abstractions of Cell and Block Properties / Hedi Harizi." München : Verlag Dr. Hut, 2010. http://d-nb.info/1009095439/34.
Повний текст джерелаShriharsha, Swarga. "Development of a method that quantifies the filtration efficiency of soft particles in drop-in fuels." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-261143.
Повний текст джерелаDet globala koldioxidavtrycket ökar med tidens gång. Världen rör sig mer mot ökad fossilfrihet och minskat beroende av fossila bränslen för dagliga behov. Transportsektorn är idag den största användaren av fossila bränslen och den största bidragaren till de CO2-utsläpp som leder till global uppvärmning. Biobränslen utgör ett lovande och hållbart alternativ till fossila bränslen. Om biobränslen används i sin rena form i fordonen krävs det att motorerna anpassas. Därför introduceras konceptet drop-in fuels. Drop-in fuels är fossila bränslen som blandats med biobränslen. Dessa bränsleblandningar har flera fördelar, som en minskad mängd oförbrända kolväteföreningar och en minskad toxicitet. Å andra sidan leder blandandet av fossila bränslen och biobränslen till bildandet av olösliga organiska föreningar även kallade mjuka partiklar. Dessa mjuka partiklar ackumuleras i bränslefiltret och leder till ett tryckfall som minskar bränsleflödet in i motorn. Ett minskat inflöde av bränsle till motorn leder till en försämrad motorprestanda. Denna studie ämnar utveckla en metod för att kvantifiera mängden mjuka partiklar i drop-in fuels med en filtreringsteknik. Den första fasen av studien innefattar en litteraturstudie om föroreningar i drop-in fuels, olika filtreringstekniker och några olika analysmetoder. Litteraturstudien följs av en serie experiment som ämnar kvantifiera mängden mjuka partiklar. Den första delen av denna experimentserie ämnade utveckla en metod för att framställa dessa mjuka partiklar. Efterföljande experimentserie innefattade att tillsätta dessa mjuka partiklar till en bränslevätska för att framställa en syntetisk testvätska. Slutligen, genom att filtrera denna testvätska och analysera vätskan före och efter filtret, kan effektiviteten av filtreringsprocessen bestämmas. Analysmetoder som Gaskromatografi och masspektroskopi (GC/MS) och Fourier Transform Infraröd Spektroskopi (FTIR) användes för analysen.
Boodoo, Sudesh. "Estimation of drop-size distributions from deconvolved doppler radar data." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=69698.
Повний текст джерелаThe fast Fourier transform and two iterative methods of deconvolution were applied to simulated Doppler spectra. We concluded that the iterative methods of deconvolution are more appropriate than the fast Fourier transform. Of the two iterative methods, Jansson's method of deconvolution, including prefiltering of the data, was found to give better results than Van Cittert's method.
Jansson's method was applied to biomodal spectra obtained from the HARP project of 1990 in Hawaii and to spectra obtained from a similar radar operated in Montreal. Evident is the different characteristics of rainfall in both regions and the appropriateness of the same deconvolution method to different classes of spectra.
Fekete, Denise M. "Pro-drop and verb-second : romance and germanic in Old French." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63760.
Повний текст джерелаLee, Gyu Won. "Errors in rain mearurement by radar : effect of variability of drop size distributions." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=19509.
Повний текст джерелаDuangsuwan, Wiriya. "Experimental studies of the mixing of alcohols with vegetable oil using gas-liquid compound drops for applications in bio-fuel production." Thesis, University of Surrey, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521716.
Повний текст джерелаLim, Albert Kee Wah. "Non-linear response of reinforced concrete coupling slab with drop panel in earthquake-resisting shear wall structures." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=55618.
Повний текст джерелаEdwards, Kerri. "Greenhouse gas emissions from drip irrigated tomato fields." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=123327.
Повний текст джерелаLes techniques d'irrigation affectent l'humidité du sol dans les terres agricoles, ce qui affecte les émissions de gaz à effets de serre. Une étude sur le terrain d'une durée de deux ans a été menée dans le sud-ouest de l'Ontario au Canada afin de déterminer les émissions de CO2, CH4 et N2O de champs de tomates irrigués au goutte-à-goutte de surface et au goutte-à-goutte souterrain. Les flux de gaz ont été obtenus en prenant des échantillons à chaque 15 minute pour une durée d'une heure, en utilisant la méthode de chambre statique. L'humidité et la température des sols ont été mesurés et utilisés afin d'expliquer les émissions de gaz. La moyenne de flux de N2O a atteint un sommet de 405µg N2O-N m-2 h-1 dans le cas de l'irrigation au goutte-à-goutte de surface, peu de temps après un épisode de pluie. La majorité des flux de N2O qui se sont produits pendant le moment de la saison utilisant de l'irrigation était d'environ 50 µg N2O-N m-2 h-1 dans les deux traitements. La plus faible (12mg CO2-C m-2 h-1) et la plus haute (123mg CO2-C m-2 h-1) moyenne des flux des traitements ont toutes les deux été observées dans les champs irrigués au goutte-à-goutte de surface. Les flux de CH4 étaient principalement négatifs ce qui indiquent que les sols sont des puits, plutôt qu'une source de ce gaz. Une différence significative entre les flux des traitements a été démontrée seulement pour un nombre limité de jour parce que l'humidité des sols créée par les deux systèmes d'irrigation de goutte-à-goutte était similaire. Les émissions saisonnières de CO2 étaient significativement plus hautes dans le cas des champs irrigués au goutte-à-goutte de surface que les champs irrigués au goutte-à-goutte souterrain en 2013, mais pas en 2012, ce qui est probablement dû aux différences dans les températures des sols. Globalement, l'utilisation de l'irrigation au goutte-à-goutte de surface ou de l'irrigation au goutte-à-goutte souterraine n'a pas d'effet majeur sur les émissions de gaz des sols dans les champs de tomates.
Monette, Liza. "Numerical simulations of nucleation and growth phenomena." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=64053.
Повний текст джерелаParikh, Anand. "LONG-TERM CRANIAL RECONSTRUCTIONS IN FULL THICKNESS DEFECTS USING CARBONATED CALCIUM PHOSPHATE CEMENT WITH TITANIUM MESH SCAFFOLD IN A SHEEP MODEL: BIOMECHANICAL ANALYSIS." Akron, OH : University of Akron, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1164993505.
Повний текст джерела"December, 2006." Title from electronic thesis title page (viewed 06/27/2007) Co-Advisors, Glen O. Njus, Daniel B. Sheffer; Faculty Reader, Mary C. Verstraete; Department Chair, Daniel B. Sheffer; Dean of the College, George K. Haritos; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.
Mensah, Joel B. [Verfasser], Regina Akademischer Betreuer] Palkovits, and Lars Mathias [Akademischer Betreuer] [Blank. "Chemo-catalytic and electrochemical deoxygenation of bio-derivable 3-hydroxydecanoic acid : production of drop-in fuels and fine chemicals / Joel Boakye Mensah ; Regina Palkovits, Lars M. Blank." Aachen : Universitätsbibliothek der RWTH Aachen, 2020. http://d-nb.info/1226303811/34.
Повний текст джерелаKoziol, Anna S. (Anna Sophia). "The effect of turbulence on the collision rates of small cloud drops." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=28802.
Повний текст джерелаWe developed a method to calculate collision rates of small hydrodynamically interacting drops embedded in an external flow field; we call it the flux method. Then, the method was tested for simple cases of laminar flows such as linear shear and a two-dimensional deformation field. The tests were designed not only to validate the method but also to examine the mechanisms associated with the simplified types of external flows which may be equally important for real turbulent flows.
In order to obtain estimates of collision rates for turbulent flows, the flux method was used in conjunction with a probabilistic approach. Numerous simulations of trajectories of two hydrodynamically interacting droplets in a turbulent field were carried out. The ratio of the number of collisions to the total number of simulations gave the probability of collision for different relative positions of the drops. Because the Reynolds number of the flow around droplets (based on the drop radius and terminal velocity) is small, the trajectories were calculated with the help of a model based on the linear Stokes hydrodynamics. Turbulence was modelled in the form of random Fourier modes with both the space and the time spectrum prescribed. Both spectra were characterized by Kolmogorov scaling. The space spectrum was modelled in the inertial and dissipation subranges. On the basis of scale analysis, only small scale time variations were allowed, and, the so called Eulerian-Lagrangrian time spectrum was applied.
The results show that most collision rates increase moderately in a turbulent flow characterized by a rate of energy dissipation of the order of 1, 10, and 100 cm$ sp2$ sec$ sp{-3}.$ The estimated increase in collision efficiencies, however, is not uniform, and a rather complicated relation between the increase in the collision efficiency and the parameters--the drop radii, and the rate of energy dissipation--can be observed.
Cunningham, Mark Huzzard. "Effect of coolant velocity on the fragmentation of single melt drops in water." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27214.
Повний текст джерелаResults showed that there was a transition from thermal to hydrodynamic fragmentation through an intermediate stage in which the drops initially underwent hydrodynamic fragmentation followed by the formation of a vapour bubble. For low velocities (9 m/s) this bubble collapsed, fragmenting the remainder of the drop while at great velocities (15 m/s) the drop broke up within the bubble before it condensed. At 22 and 28 m/s there was no vapour formation and the drop fragmented due to hydrodynamic effects. The total non-dimensional break-up time was 2.0-2.5 for all cases.
Pilon, Mark J. (Mark Joseph). "A numerical and observational study of bimodal surface raindrop size distributions /." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66028.
Повний текст джерелаCiccarelli, Gaby. "Investigation of vapor explosions with single molten metal drops in water using flash X-ray." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39276.
Повний текст джерелаMafuta, Million Trocco. "Design and implementation of an efficient solar powered irrigation management system for drip irrigated maize field." Thesis, University of Strathclyde, 2014. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=24708.
Повний текст джерелаKafadar, Cemal 1954. "When coins turned into drops of dew and bankers became robbers of shadows : the boundaries of Ottoman economic imagination at the end of the sixteenth century." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75361.
Повний текст джерелаChapter I surveys the development of Ottoman historiography prior to the late sixteenth century, with the aim of highlighting the novelty of the critical perspectives developed by historians of the era like Ali, Lokman and Selaniki. The attitudes and analyses of these historians concerning disturbing economic processes such as monetary turbulence and price movements constitute the focus of Chapters II and III respectively. These chapters argue that Ottoman decline consciousness grew partly in response to a keen awareness of newly emerging social and economic forces that Ottoman reform literature chose not to understand and accomodate but to resist and suppress. The failure of Ottoman intellectuals to come to terms with the new market forces of the early modern world was not due to an anti-mercantile bias, but to the primacy of politics in the Ottoman order. Chapter IV traces the international commercial activities of Ottoman Muslims in the context of a comparison between Ottoman decline consciousness and European mercantilism.
Castrillon, Escobar Sebastian. "Instabilité et dispersion de jets de corium liquides : analyse des processus physiques et modélisation dans le logiciel MC3D." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0102/document.
Повний текст джерелаIn the case of a severe accident in a nuclear power plant, the molten core may flow into water and interact with it. The consequences of this fuel-coolant interaction (FCI) for the follow-up of the accident may be numerous so the phenomenon needs to be described accurately, one of them called “steam explosion” can lead to the failure of the nuclear reactor containment. FCI is a complex multiphase interaction involving several physical phenomena. The premixing phase of the interaction consists in the fragmentation and dispersion of corium in the coolant pool. This phase is driven by the fragmentation process which modifies heat transfers (coolant boiling dynamics) and chemical reactions (corium oxidation and hydrogen generation). This thesis brings new elements about the corium jet and droplet breakup with the main goal of improve fragmentation models on the MC3D multiphase code, developed by the IRSN. Our study is based on a multi-scale fragmentation process where the jet fragmentation rate and final droplet dimensions are not coupled themselves. We suppose a fragmentation process resulting from a primary instability (mass transfer within jet and big droplets) depending on the large flow scales and a secondary instability depending on the small flow scales (leading to final droplet breakup). This model has been implemented in MC3D in combination with the MUSIG method recently added to MC3D. In this method, droplets are represented using several classes, each of them with their own droplet diameter, mass and energy fields. Despite new improvements on modeling corium fragmentation, there is still a lack on the comprehension and characterization on the liquid droplet fragmentation, particularly on liquid/liquid configurations. In this thesis, we study in detail droplet breakup using the computational fluid dynamics software GERRIS. As a result, we find a new droplet breakup classification in liquid/liquid configurations, we improve the droplet breakup dynamics comprehension and we analyze the droplet-vortex interaction to determine breakup regime transition
Akshay, S. "Fuel Drop Splashing on Heated Solid Surfaces." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5118.
Повний текст джерелаShih, Yu-Cheng, and 石育政. "Combustion Applications of Fuel Oil Additives and Liquid Drop-Jet Collisions." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/63180139210880611204.
Повний текст джерела國立成功大學
機械工程學系碩博士班
91
A multi-functional multi-fuel industrial furnace simulator was utilized to study the burning characteristics and pollutant emissions of fuel oils containing various additives. Three specimens were tested. The first was light-oil-added fuel oil, which burned well and could reduce the emission of SOX and NOX. The second was water-emulsified fuel oil, which decreased the burning intensity and reduced SOX emission. For NOX reduction, the amount of water added had to be over 10%. The third was fuel oil with trace additives. Some additives could intensify burning. Some showed reduction in NOX. But none of them changed SOX emission. For drop-jet collision experiment, we utilized a piezo-electric drop generator to produce a stream of uniform droplets, which was directed to collide with a liquid jet of the same diameter as the drop. The dimensionless parameters governing the collision phenomena are the jet-axial Weber number, the jet-cross-sectional Weber number, and the impact parameter. We have discovered four types of collision outcome: (a) Segmenting coalescence-this happens at high jet-cross-sectional Weber number, low jet-axial Weber number. (b) Clinging coalescence-this happens at low jet-cross-sectional Weber number, high jet-axial Weber situation. (c) Stretching separation-this happens at high impact parameters. (d) Reflecting separation-only occurs at low impact parameters and a specific jet-axial Weber number range.
Bhat, Maanasa. "Experimental Investigation of Fuel Drop Impact on Unheated and Heated Solid." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/4720.
Повний текст джерелаLiang, Jason Jian. "Design and Development of an Experimental Apparatus to Study Jet Fuel Coking in Small Gas Turbine Fuel Nozzles." Thesis, 2013. http://hdl.handle.net/1807/43080.
Повний текст джерелаPacheco, Gonçalo de Sousa Pina Pernicha. "Single droplet ignition and combustion of jet-A1, hydroprocessed vegetable oil and their blends in a drop tube furnace." Master's thesis, 2019. http://hdl.handle.net/10400.6/10388.
Повний текст джерелаO impacto ambiental e a dependência de combustíveis fósseis no setor aeronáutico promoveram a procura por combustíveis alternativos e ecológicos. Este é um dos principais desafios para este setor no futuro. Uma possível solução num futuro próximo pode ser a mistura de biocombustíveis com combustível de aviação, o que permitiria o uso de combustível mais ecológico e a redução de gases de efeito estufa e emissões sem alterações significativas nas frotas existentes das empresas, isto é, o desenvolvimento de um combustível “drop-in”. Neste contexto, este trabalho examina as características de ignição e combustão de gotas isoladas de jet-A1 (JF), óleo vegetal hidroprocessado (NExBTL) e suas misturas num forno de queda livre (DTF). O objetivo deste trabalho é avaliar a influência da composição da mistura nas características do combustível. Gotas com diâmetros de 155 ± 5 µm, produzidas por um gerador comercial de gotas, foram injetadas no DTF, cuja temperatura da parede e concentração de oxigênio eram controladas. Os testes foram conduzidos para três temperaturas (900, 1000 e 1100 ºC). A ignição e a combustão das gotículas foram avaliadas através das imagens obtidas com uma câmara de alta velocidade acoplada a uma lente de alta ampliação e um algoritmo de deteção de limites. As imagens permitiram a observação dos fenómenos de queima e avaliar a evolução temporal do tamanho das gotas e das taxas de queima. Os resultados revelaram que as misturas de combustível seguem a lei D2 , exceto a mistura com 75% de JF para uma temperatura de 1100 ºC na parede do DTF. Isso ocorreu devido à ocorrência de puffing e microexplosões, o que aumentou as taxas de queima. Observou-se ainda que as misturas com maior teor de JF apresentam chamas com maior intensidade luminosa e maiores taxas de queima.