Дисертації з теми "Heat and mass transfer analysis"
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Mattingly, Brett T. (Brett Thomas). "Containment analysis incorporating boundary layer heat and mass transfer techniques." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/84749.
Повний текст джерелаTien, Hwa-Chong. "Analysis of flow, heat and mass transfer in porous insulations /." The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487672631599499.
Повний текст джерелаHaq, Inam Ul. "Heat and mass transfer analysis for crud coated PWR fuel." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/6373.
Повний текст джерелаHublitz, Inka. "Heat and mass transfer of a low pressure Mars greenhouse simulation and experimental analysis /." [Gainesville, Fla.] : University of Florida, 2006. http://purl.fcla.edu/fcla/etd/UFE0013488.
Повний текст джерелаBohra, Lalit Kumar. "Analysis of Binary Fluid Heat and Mass Transfer in Ammonia-Water Absorption." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19780.
Повний текст джерелаOjada, Ejiro Stephen. "Analysis of mass transfer by jet impingement and study of heat transfer in a trapezoidal microchannel." [Tampa, Fla] : University of South Florida, 2009. http://purl.fcla.edu/usf/dc/et/SFE0003297.
Повний текст джерелаDuda, Anna. "Numerical analysis of heat and mass transfer processes within an infant radiant warmer." Thesis, University of Leeds, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555901.
Повний текст джерелаSubramaniam, Vishwanath. "Computational analysis of binary-fluid heat and mass transfer in falling films and droplets." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26485.
Повний текст джерелаCommittee Chair: Garimella, Srinivas; Committee Member: Fuller, Tom; Committee Member: Jeter, Sheldon; Committee Member: Lieuwen, Tim; Committee Member: Wepfer, William. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Olanrewaju, Anuoluwapo Mary. "Analysis of boundary layer flow of nanofluid with the characteristics of heat and mass transfer." Thesis, Cape Peninsula University of Technology, 2011. http://hdl.handle.net/20.500.11838/2157.
Повний текст джерелаNanofluid, which was first discovered by the Argonne laboratory, is a nanotechnology- based heat transfer fluid. This fluid consists of particles which are suspended inside conventional heat transfer liquid or base fluid. The purpose of this suspension is for enhancing thermal conductivity and convective heat transfer performance of this base fluid. The name nanofluid came about as a result of the nanometer- sized particles of typical length scales 1-100nm which are stably suspended inside of the base fluids. These nanoparticles are of both physical and chemical classes and are also produced by either the physical process or the chemical process. Nanofluid has been discovered to be the best option towards accomplishing the enhancement of heat transfer through fluids in different unlimited conditions as well as reduction in the thermal resistance by heat transfer liquids. Various manufacturing industries and engineering processes such as transportation, electronics, food, medical, textile, oil and gas, chemical, drinks e.t.c, now aim at the use of this heat transfer enhancement fluid. Advantages such organisations can obtain from this fluid includes, reduced capital cost, reduction in size of heat transfer system and improvement of energy efficiencies. This research has been able to solve numerically, using Maple 12 which uses a fourth- fifth order Runge -kutta- Fehlberg algorithm alongside shooting method, a set of nonlinear coupled differential equations together with their boundary conditions, thereby modelling the heat and mass transfer characteristics of the boundary layer flow of the nanofluids. Important properties of these nanofluids which were considered are viscosity, thermal conductivity, density, specific heat and heat transfer coefficients and microstructures (particle shape, volume concentration, particle size, distribution of particle, component properties and matrixparticle interface). Basic fluid dynamics equations such as the continuity equation, linear momentum equation, energy equation and chemical species concentration equations have also been employed.
Torres, Alvarez Juan Felipe. "A study of heat and mass transfer in enclosures by phase-shifting interferometry and bifurcation analysis." Thesis, Ecully, Ecole centrale de Lyon, 2014. http://www.theses.fr/2014ECDL0001/document.
Повний текст джерелаFundamental questions concerning the mass diffusion properties of biological systems under isothermal and non-isothermal conditions still remain due to the lack of experimental techniques capable of visualizing and measuring mass diffusion phenomena with a high accuracy. As a consequence, there is a need to develop new experimental techniques that can deepen our understanding of mass diffusion. Moreover, steady natural convection in a tilted three-dimensional rectangular enclosure has not yet been studied. This tilt can be a slight defect of the experimental device or can be imposed on purpose. In this dissertation, heat and mass transfer phenomena in parallelepiped enclosures are studied focusing on convectionless thermodiffusion and on natural convection of pure fluids (without thermodiffusion). Mass diffusion is studied with a novel optical technique, while steady natural convection is first studied in detail with an improved numerical analysis and then with the same optical technique initially developed for diffusion measurements. A construction of a precise optical interferometer to visualize and measure mass diffusion is described. The interferometer comprises a polarizing Mach–Zehnder interferometer, a rotating polariser, a CCD camera, and an original image-processing algorithm. A method to determine the isothermal diffusion coefficient as a function of concentration is proposed. This method uses an inverse analysis coupled with a numerical calculation in order to determine the diffusion coefficients from the transient concentration profiles measured with the optical system. Furthermore, thermodiffusion of protein molecules is visualized for the first time. The proposed method has three main advantages in comparison to similar methods: (i) reduced volume sample, (ii) short measurement time, and (iii) increased hydrodynamic stability of the system. These methods are validated by determining the thermophysical properties of benchmark solutions. The optical technique is first applied to study isothermal diffusion of protein solutions in: (a) dilute binary solutions, (b) binary solutions with a wide concentration range, and (c) dilute ternary solutions. The results show that (a) the isothermal diffusion coefficient in dilute systems decreases with molecular mass, as roughly predicted by the Stokes-Einstein equation; (b) BSA protein has a hard-sphere-like diffusion behaviour and lysozyme protein a soft sphere characteristic; and (c) the cross-term effect between the diffusion species in a dilute ternary system is negligible. The optical technique is then applied to (d) non-isothermal dilute binary solutions, revealing that that the aprotinin (6.5 kDa) and lysozyme (14.3 kDa) molecules are thermophilic and thermophobic, respectively, when using water as solvent at room temperature. Finally, the optical technique is applied to study Rayleigh-Bénard convection in a horizontal cubical cavity. Since natural convection can be studied in more depth by solving the Navier-Stokes equations, a bifurcation analysis is proposed to conduct a thorough study of natural convection in three-dimensional parallelepiped cavities. Here, a continuation method is developed from a three-dimensional spectral finite element code. The proposed numerical method is particularly well suited for the studies involving complex bifurcation diagrams of three-dimensional convection in rectangular parallelepiped cavities. This continuation method allows the calculation of solution branches, the stability analysis of the solutions along these branches, the detection and precise direct calculation of the bifurcation points, and the jump to newly detected stable or unstable branches, all this being managed by a simple continuation algorithm. This can be used to calculate the bifurcation diagrams describing the convection in tilted cavities. [...]
Ohmori, Hiroko. "A Numerical Study of Solid Oxide Iron-Air Battery:Thermodynamic Analysis and Heat and Mass Transfer Characteristics." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215529.
Повний текст джерелаGoulet, Remi. "Development and analysis of an innovative evaporator/absorber for automotive absorption-based air conditioning systems : investigation on the simultaneous heat and mass transfer." Thesis, Lyon, INSA, 2011. http://www.theses.fr/2011ISAL0099.
Повний текст джерелаAutomotive air conditioning systems are based on the vapour compression cycle that requires mechanical energy for its operation. This mechanical energy is provided by the engine, which engenders year-averaged fuel extra consumptions, and thereby extra pollutant emissions, of the order of 5 %. Absorption cooling technology is of interest as this system could be driven by the engine waste heat.The absorption air conditioning technology has been under the scope of the R&D services of the french manufacturer PSA Peugeot Citroën for a decade. PSA's major innovation concerns the evaporator/absorber: a new system based on the confinement inside capillary structures of refrigerant and absorbent falling films has been patented. This new layout aims at avoiding unwanted mixing of the fluids. Experimental analysis of this original component has shown that the refrigerating effect is limited by the absorption phenomenon. It was proved that the refrigerating effect produced by the system is equal to one third of the maximal effect that could be achieved. A simple model of the absorption part has been proposed. It provides a guideline to improve the design of the component. A literature review has revealed that the absorption models are based on assumptions whose reliability is not obvious. Especially, most of the authors assume that the thermophysical properties are constant. The impact of this assumption has been clarified in the simple case of pool absorption. Modeling the simultaneous heat and mass transfer that takes place in the liquid absorbent requires to account for the increase of the liquid volume. This was achieved by means of a finite-volume treatment of the governing equations over a dynamic grid. Two procedures for the grid deformation have been implemented and compared. The numerical results have been compared to experimental results obtained on a bench developed on purpose and to experimental data from the literature. Finally, the impact of the non-absorbable gases on the absorption rate has been investigated numerically and experimentally, in the pool absorption case. This study enabled to confirm the phenomena at the origin of the decrease of the absorption rate. However, we could not clarify with certainty the importance of gravity-driven flows in the vapour phase, in the presence of non-absorbable gases
Ali, Ahmad A. "Analysis of heat and mass transfer between air and falling film desiccant for different flow configurations in the presense [i.e. presence] of ultrafine particles." The Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1060028115.
Повний текст джерелаDuty, Chad Edward. "Design, operation, and heat and mass transfer analysis of a gas-jet laser chemical vapor deposition system." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/17925.
Повний текст джерелаAsfand, Faisal. "Analysis of heat and mass transfer in membrane-based absorbers with new working fluid mixtures for absorption cooling systems." Doctoral thesis, Universitat Rovira i Virgili, 2016. http://hdl.handle.net/10803/395951.
Повний текст джерелаGondre, Damien. "Numerical modeling and analysis of heat and mass transfers in an adsorption heat storage tank : Influences of material properties, operating conditions and system design on storage performances." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI022/document.
Повний текст джерелаThe development of energy storage solutions is a key challenge to enable the energy transition from fossil resources to renewable energies. The need to store energy actually comes from a dissociation between energy sources and energy demand. Storing energy meets two principal expectations: have energy available where and when it is required. Low temperature heat, for dwellings and offices heating, represents a high share of overall energy consumption (i.e. about 35 %). The development of heat storage solutions is then of great importance for energy management, especially in the context of the growing part of renewable energies. Adsorption heat storage appears to be the best trade off among available storage technologies in terms of heat storage density and performances over several cycles. Then, this PhD thesis focuses on adsorption heat storage and addresses the enhancement of storage performances and system integration. The approach developed to address these issues is numerical. Then, a model of an adsorption heat storage tank is developed, and validated using experimental data. The influence of material thermophysical properties on output power but also on storage density and system autonomy is investigated. This analysis enables a selection of particularly influencing material properties and a better understanding of heat and mass transfers. The influence of operating conditions is also underlined. It shows the importance of inlet humidity on both storage capacity and outlet power and the great influence of discharge flowrate on outlet power. Finally, it is shown heat storage capacity depends on the storage tank volume, while outlet power depends on cross section area and system autonomy on bed length. Besides, the conversion efficiency from absorbed energy (charge) to released energy (discharge) is 70 %. But during the charging process, about 60 % of incoming heat is not absorbed by the material and directly released. The overall conversion efficiency from energy provided to energy released is as low as 25 %. This demonstrates that an adsorption heat storage system cannot be thought of as a self-standing component but must be integrated into the building systems and control strategy. A clever use of heat losses for heating applications (in winter) or inlet fluid preheating (in summer) enhances global performances. Using available solar heat for system preheating is an interesting option since a part is instantly retrieved at the outlet of the storage tank and can be used for direct heating. Another part is stored as sensible heat and can be retrieved a few hours later. At least, it has the advantage of turning the adsorption storage tank into a combined sensible-adsorption storage tank that offers short-term and long-term storage solutions. Then, it may differ avoidable discharges of the sorption potential and increase the overall autonomy (or coverage fraction), in addition to optimizing chances of partial system recharge
Kombo, Rainah. "Qualitative analysis of flow patterns : two-phase flow condensation at low mass fluxes and different inclination angles." Diss., University of Pretoria, 2016. http://hdl.handle.net/2263/61303.
Повний текст джерелаDissertation (MSc)--University of Pretoria, 2016.
Mechanical and Aeronautical Engineering
MSc
Unrestricted
Payette, Gregory Steven. "Mathematical modeling of evaporative cooling of moisture bearing epoxy composite plates." Texas A&M University, 2003. http://hdl.handle.net/1969.1/3857.
Повний текст джерелаRedman, Adam L. "Modelling of vacuum drying of Australian hardwood species." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/110505/1/Adam_Redman_Thesis.pdf.
Повний текст джерелаThabot, Arnaud Henri. "Porosity Analysis in Starch Imbued Handsheets - Challenges using impulse drying and methods for image analysis." Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19804.
Повний текст джерелаHo, Son Hong. "Numerical modeling and simulation for analysis of convective heat and mass transfer in cryogenic liquid storage and HVAC&R applications." [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0002266.
Повний текст джерелаNourgaliev, Robert R. "Modeling and analysis of heat and mass transfer processes during in-vessel melt progression stage of light water reactor (LWR) severe accidents /." Stockholm : Tekniska högsk, 1998. http://www.lib.kth.se/abs98/nour0427.pdf.
Повний текст джерелаMetri, Prashant G. "Mathematical Analysis of Forced Convective Flow Due to Stretching Sheet and Instabilities of Natural Convective Flow." Doctoral thesis, Mälardalens högskola, Utbildningsvetenskap och Matematik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-35222.
Повний текст джерелаCervato, Andrea. "Energy analysis of household devices and their modeling software." Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3424302.
Повний текст джерелаLo scopo di questo lavoro è stato lo sviluppo di tre modelli numerici adatti alla simulazione dinamica di asciugatrici domestiche. In particolare modo è stata analizzata l’asciugabiancheria a pompa di calore, l’asciugabiancheria ad aria ventilata ed infine l’asciugabiancheria a condensa. Oggigiorno i produttori di asciugabiancheria, per ragioni di competitività, si stanno sfidando sul mercato con prodotti sempre più efficienti: ridotto consumo energetico e ridotta durata del ciclo. Questa sfida ha condotto all’uso di metodologie di lavoro innovative come il "model-based-design" adatto all’analisi di sistemi complessi e non lineari come è il ciclo di asciugatura. In questo approccio riveste un ruolo fondamentale lo sviluppo di un modello matematico che spieghi il funzionamento del sistema. L’asciugatrice a pompa di calore è costituita da tre componenti principali: modulo pompa di calore, cesto e circuito aeraulico. Per ognuno di essi è stato sviluppato un modello. La prima parte di questo lavoro è stata dedicata allo sviluppo di un modello dinamico del ciclo a compressione di vapore usando un approccio di primo principio in cui i principi di conservazione della massa e dell’energia vengono applicati per sviluppare le equazioni che ne descrivono il comportamento. Gli scambiatori di calore sono stati modellizzati attraverso l’approccio a frontiera mobile noto in letteratura con il nome: "moving-boundary". Per la stima della portata di refrigerante elaborata dal tubo capillare è stata impiegata una relazione analitica disponibile in letteratura, coerente con i valori sperimentali. Infine il comportamento dinamico del compressore manifestatosi durante alcune fasi del ciclo di asciugatura, è stato considerato sviluppando un modello a due capacità termiche. Le caratteristiche del circuito aeraulico della pompa di calore sono state soggette prima ad analisi sperimentali, permettendo la derivazione delle correlazioni in grado di stimare le perdite di carico lato aria di processo, e successivamente alla loro modellizzazione utilizzando l’analogia elettrica. Una significativa parte del lavoro è stata concentrata sull’analisi del processo di evaporazione a cui è soggetta l’acqua contenuta nei panni. L’analisi sperimentale condotta ha permesso di sviluppare la correlazione che spiega come varia la trasmittanza media aria-panni durante il ciclo di asciugatura, inoltre sfruttando l’analogia di scambio di calore e di massa, basata sul numero di Lewis, è stato determinato il coefficiente medio di scambio di massa. Il sistema acqua-panni è stato modellizzato con un approccio originale che prevede di dividerlo in due zone: una zona secca ed una zona bagnata, l’estensione della zona bagnata è funzione del grado di asciugatura. La correlazione che spiega come varia l’estensione di tale zona è stata ricavata dai dati sperimentali. Il modello è stato validato e mostra una accuratezza del 5% nella predizione del tempo di asciugatura. I tre sotto-modelli sviluppati sono stati collegati tra di loro in modo da sviluppare il modello complessivo dell’asciugabiancheria a pompa di calore. L’attendibilità del modello è stata verificata prima con confronti sperimentali e successivamente con più casi studio che hanno evidenziato, qualora il tempo ciclo fosse predetto, delle deviazioni di circa il 10% sulla stima del consumo energetico del compressore. La seconda piattaforma di asciugabiancheria che è stata analizzata è il modello ad aria ventilata. Questo tipo di elettrodomestico opera con una configurazione di ciclo aperta in cui l’aria uscente dal cesto viene espulsa in ambiente. Lo sforzo modellistico è stato concentrato nella comprensione dei fenomeni fluidodinamici che ne regolano il funzionamento. Due tipi di sorgenti di perdita sono stati messi in luce, in questi punti, l’aria può entrare nel sistema. L’effetto della portata non riscaldata influenza notevolmente le prestazioni dell’asciugabiancheria. L’intera caratterizzazione sperimentale del circuito aeraulico ha permesso di dedurre delle correlazioni che stimano le perdite di carico attraverso i vari componenti. Ciò ha permesso la derivazione di un modello aeraulico, che accompagnato dalla descrizione dinamica dell’elemento riscaldante, ha permesso lo sviluppo del modello complessivo della macchina. Il modello è stato validato sperimentalmente ed il confronto tra risultati sperimentali e numerici ha indicato che esso è in grado di predire eccellentemente le prestazioni della macchina nel ciclo di aciugatura. La terza piattaforma di asciugabiancheria che è stata analizzata è il tipo a condensa. Esso può essere visto come un’estensione del modello ad aria ventilata in cui il flusso d’aria proveniente del cesto viene ricircolato ma prima di passare attraverso l’elemento riscaldante il flusso d’aria transita in uno scambiatore compatto ad aria dove viene raffreddato e deumidificato. Pertanto lo sforzo modellistico si è concentrato non solo nello sviluppo del consueto modello aeraulico derivato dai dati sperimentali ma anche nello sviluppo di un modello bidimensionale dello scambiatore di calore. La piastra metallica dello scambiatore di calore è strata discretizzata bidimensionalmente. Il modello è in grado di cogliere fenomeni sia di scambio sensibile che di trasporto di massa. Le capacità di predizione del modello sono state testate confrontando i risultati su un intero ciclo di asciugatura. La diversa configurazione della flangia, che immette l’aria all’interno del cesto, riduce la porzione attiva di portata d’aria a contatto con i panni.
Iacob, Constantin. "Transfert thermique et transfert de masse en lit fluidise. Application à la nitruration d'aciers." Rouen, 1996. http://www.theses.fr/1996ROUES020.
Повний текст джерелаBouzarour, Amina. "Auto-échauffement d'un lit ventilé de matériaux carbonés : cas du bois torréfié Experimental study of torrefied wood fixed bed: Thermal analysis and source term identification." Thesis, Ecole nationale des Mines d'Albi-Carmaux, 2019. http://www.theses.fr/2019EMAC0012.
Повний текст джерелаTorrefaction is one of the thermo-chemical pretreatment processes of lignocellulosic biomass that facilitates both the storage and transport of the material and increases the energy value of the product. However, as the torrefied substrate is more reactive, it is more prone to spontaneous exothermic mechanisms that can lead to self-heating of the material. This issue is not well investigated in the case of torrefied wood since its industrial application is mainly in the test phase. For this reason, this topic is further studied throughout this thesis. Indeed, the aim was to understand the phenomena responsible for the self-heating of a bed of biomass ventilated with oxidizing gas at low temperature. To do this, self-heating scenarios of torrefied wood chips were created under an oxidizing atmosphere. Pilot-scale experiments were conducted in a 12 L fixed-bed reactor. During these tests, we demonstrated that self-heating is intensified when the oxidizing gas flow rate is low and under a high oxygen fraction. In addition, the heat produced during the self-heating of the wooden bed was estimated on the basis of a heat balance and thermal data. Then, the source term was correlated to the oxygen fraction and temperature in a simplified model. The apparent kinetic parameters and heat of reaction associated with self-heating were derived from this. On the other hand, in order to understand the exothermic phenomena characterizing self-heating, low temperature oxidation tests are carried out on a small scale (ATG/ATD). On the basis of these analyses, kinetic models were developed to distinguish and quantify the mechanisms identified experimentally. These two approaches have made it possible to highlight three main mechanisms involved in low-temperature oxidation: chemical adsorption of oxygen on the reagent, decomposition of the oxygen complexes formed during adsorption and a direct oxidation reaction. In a more problem-oriented approach to industrial-scale self-heating, a numerical model coupling chemical kinetics and mass and heat transfers was designed at the scale of the particle bed. This model provided a reasonable prediction of the thermal performance of the torrefied wood bed under high ventilation flow. It was then extrapolated to an industrial scale to simulate the thermal behaviour of a storage silo undergoing self-heating
Oikawa, Eduardo Hiroshi. "Avaliação de um sistema industrial de resfriamento de água." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-16112012-114140/.
Повний текст джерелаIn the present work, the performance of a system composed of a cooling tower integrated in butadiene hydrogenation plant was studied. An experimental investigation was made to characterize the cooling towers based on a phenomenological model and in real process conditions. The hydrogenation process was configured on a process simulator and design specifications were considered as base case. A cooling tower module was developed and integrated to the process simulator. The interaction of the cooling tower system and the plant operation was investigated.
Maia, Neto Alfredo dos Santos. "Simulação computacional do processo de soldagem MIG de uma junta de topo de chapas de aço inoxidável da série 304 com deposição de material." Universidade Federal de Uberlândia, 2014. https://repositorio.ufu.br/handle/123456789/14780.
Повний текст джерелаThis work presents a 3D computational/mathematical model to solve the heat diffusion equation with phase change, considering addition of material and complex geometry. The finite volume method was used and the computational code was implemented in C++, using Borland compiler. Experimental tests were carried out for validation of the model in question. It was used a material whose thermal properties, varying with temperature, are well known: the stainless steel AISI 304. In addition, an inverse technique based on Golden Section was implemented to estimate the heat flux supplied to the sample. Experimental temperatures were measured using thermocouples type J - in a total of 07 (seven) - all connected to the metal sheet and the Agilent 34970A datalogger. The metal had a \"V\" Groove of 45°. In this location was conducted the deposition of material on only one welding pass and the dimensions (width and height) were measured after welding. The thermal model was validated from comparisons between measured and calculated temperatures. The results were consistent and validated the computational/mathematical model proposed. An innovation presented in this work consists in the calculation and visualization of the dimensions of the welding pool during welding. The complex geometry obtained proves that more studies are needed and new models must be designed to clarify and explain the formation of welding pool during welding of metal sheet.
Desenvolve-se, neste trabalho, um modelo matemático/computacional 3D (tridimensional) de difusão de calor com mudança de fase, acréscimo de material e geometria complexa. O método de volumes finitos foi implementado em linguagem C, utilizando o compilador Borland. Foram realizados testes experimentais para a validação do modelo em questão. Usou-se um material cujas propriedades térmicas, variando com a temperatura, são bem conhecidas: o aço inox AISI 304. Além do modelo direto já citado, foi implementada uma técnica inversa para o cálculo do fluxo de calor. Utilizou-se neste caso a amplamente conhecida Seção Áurea: técnica que exige uma simplificação, fluxo de calor constante ao longo do tempo de soldagem. As temperaturas na chapa foram medidas utilizando termopares do tipo J - em um total de 07 (sete) - todos ligados ao datalogger Agilent 34970A. As medições foram feitas do lado oposto à tocha de soldagem. A chapa metálica possuía um chanfro em V de 45º. Neste local foi realizada a deposição de material (reforço) em somente um passe de soldagem. As dimensões da geometria do reforço (largura e altura) foram medidas depois da realização da soldagem. Em relação aos resultados, além da comparação entre as temperaturas medidas e calculadas, foi também determinada a eficiência térmica da soldagem. Os resultados foram consistentes e validaram o modelo matemático/computacional proposto. Uma inovação apresentada neste trabalho consiste no cálculo e visualização gráfica tridimensional da poça de fusão ao longo do tempo. A complexa geometria obtida comprova que mais estudos se fazem necessários e que novos modelos devem ser concebidos para esclarecer e explicar a formação da poça de fusão durante a soldagem de chapas metálicas.
Doutor em Engenharia Mecânica
Nadim, Pedram. "Irreversibility of combustion, heat and mass transfer." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13651.
Повний текст джерелаKeyhani, Alireza. "Heat and mass transfer in layered seedbed." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq23997.pdf.
Повний текст джерелаWee, H. K. "Heat and mass transfer in confined spaces." Thesis, University of Canterbury. Chemical and Process Engineering, 1986. http://hdl.handle.net/10092/5879.
Повний текст джерелаZhang, Guodong. "Heat and mass transfer in porous media." Thesis, University of Leeds, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392321.
Повний текст джерелаReichrath, Sven. "Convective heat and mass transfer in glasshouses." Thesis, University of Exeter, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391213.
Повний текст джерелаSouccar, Adham. "Heat transfer and mass transfer with heat generation in drops at high peclet number /." Connect to Online Resource-OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1177603981.
Повний текст джерелаTypescript. "Submitted as partial fulfillment of the requirements for The Doctor of Philosophy degree in Engineering." Bibliography: leaves 65-74.
Souccar, Adham W. "Heat Transfer and Mass Transfer with Heat Generation in Drops at High Peclet Number." University of Toledo / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1177603981.
Повний текст джерелаEl, Sawalhi Rayan. "Caractérisation expérimentale et modélisation multi-échelles des transferts de chaleur et de masse au sein d'isolants à structure fibreuse." Thesis, La Rochelle, 2015. http://www.theses.fr/2015LAROS011/document.
Повний текст джерелаThe use of low environmental impact materials becomes essential in the construction industry due to its high consumption of energy and natural resources. In this thesis it was focused on the bio-based and especially wool hemp insulation with interesting thermal and water properties. Hemp wool, being composed substantially of plant fibers, is an anisotropic, fibrous and highly porous material. At the microscopic level it possesses a complex and random structure, hence the interest of an accurate description to the morphology of this type of wool and to characterize its structure analysis by X-ray tomographic images and SEM images. Then a macroscopic model of coupled heat transfer and mass transport is set up to understand the behavior of these wools using the scaling method average gain. To take into account the geometric complexity of the microstructure a double change of scale was used
GRISOLIA, GIULIA. "Biofuels from micro-organisms: Thermodynamic analysis of sustainability." Doctoral thesis, Politecnico di Torino, 2022. https://hdl.handle.net/11583/2973986.
Повний текст джерелаKilic, Ilker. "Heat And Mass Transfer Problem And Some Applications." Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614140/index.pdf.
Повний текст джерелаLindblom, Jenny. "Condensation irrigation : simulations of heat and mass transfer." Licentiate thesis, Luleå : Luleå University of technology, 2006. http://epubl.luth.se/1402-1757/2006/08.
Повний текст джерелаHussain, Arshad. "Heat and mass transfer in tubular inorganic membranes." [S.l.] : [s.n.], 2006. http://diglib.uni-magdeburg.de/Dissertationen/2006/arshussain.htm.
Повний текст джерелаPorter, Simon William. "Heat and mass transfer during structured cereal baking." Thesis, University of Bristol, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.505758.
Повний текст джерелаGalbraith, Graham H. "Heat and mass transfer within porous building materials." Thesis, University of Strathclyde, 1992. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21508.
Повний текст джерелаSabir, Hisham. "Heat and mass transfer processes in absorption systems." Thesis, King's College London (University of London), 1993. https://kclpure.kcl.ac.uk/portal/en/theses/heat-and-mass-transfer-processes-in-absorption-systems(ab68d065-c159-4292-ad39-b7a820ac0054).html.
Повний текст джерелаGlockling, James L. D. "Heat and mass transfer in specific aerosol systems." Thesis, London South Bank University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303937.
Повний текст джерелаStaton, JoAnna Christen II. "Heat and Mass Transfer Characteristics of Desiccant Polymers." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/9785.
Повний текст джерелаMaster of Science
Shao, Ming. "Modelling simultaneous heat and mass transfer in wood." Thesis, Virginia Tech, 1994. http://hdl.handle.net/10919/42073.
Повний текст джерелаMaster of Science
Pembery, J. G. A. "Mass transfer modelling of heat transfer in partially blocked nuclear fuel bundles." Thesis, University of Exeter, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.354029.
Повний текст джерелаSong, Yang. "Solids transportation, heat and mass transfer in rotary dryers." Thesis, University of Ottawa (Canada), 2003. http://hdl.handle.net/10393/26346.
Повний текст джерелаMcClelland, Elizabeth A. "Heat and mass transfer in an axisymmetric sudden expansion." Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/16462.
Повний текст джерелаTzevelecos, Wassilis. "Contribution to Heat and Mass Transfer for Space Experiments." Doctoral thesis, Universite Libre de Bruxelles, 2018. https://dipot.ulb.ac.be/dspace/bitstream/2013/269864/6/contratWT.pdf.
Повний текст джерелаDoctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished