Дисертації з теми "Heat transfer reduction"
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Shi, Haifeng. "Surfactant Drag Reduction and Heat Transfer Enhancement." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1343664380.
Повний текст джерелаMaxson, Andrew. "Heat Transfer Enhancement in Turbulent Drag Reducing Surfactant Solutions." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1500419520976994.
Повний текст джерелаOakes, Brian K. "Reduction of convective heat transfer from reacting flows by application of electric fields." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-08042009-040424/.
Повний текст джерелаSood, Arun. "A study of drag reduction and convective heat transfer reduction in turbulent flow through pipes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ31534.pdf.
Повний текст джерелаParmar, Manjeet Singh. "Fluidized bed combustion of carbons and reduction of NOâ†x and Nâ†2O." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243062.
Повний текст джерелаOrchard, D. M. "The near-wall structure of the thermal turbulent boundary layer over riblets." Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339557.
Повний текст джерелаCoetsee, Theresa. "Non-isothermal reaction of iron ore-coal mixtures." Pretoria : [s.n.], 2007. http://upetd.up.ac.za/thesis/available/etd-07092008-142912/.
Повний текст джерелаEschenbacher, Jens F. "Drag Reduction and Heat Transfer Characteristics of Surfactant-added Flows with Large-scale Longitudinal Vortices." 京都大学 (Kyoto University), 2003. http://hdl.handle.net/2433/149461.
Повний текст джерелаQi, Yunying. "Investigation of Relationships among Microstructure, Rheology, Drag Reduction and Heat transfer of Drag Reducing Surfactant Solutions." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1036712806.
Повний текст джерелаGreen, Jeffrey Andrew. "IMPROVING THE ENERGY EFFICIENCY OF A MID-SIZE POWER PLANT BY REDUCTION IN AUXILIARY POWER AND IMPROVED HEAT TRANSFER." OpenSIUC, 2014. https://opensiuc.lib.siu.edu/theses/1502.
Повний текст джерелаKarve, Madhura Shreeram. "Numerical Analysis of Heat Transfer Enhancement and Pressure Drop Reduction for an A-frame Air Cooled Steam Condenser." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1307440507.
Повний текст джерелаNarvaez, Javier Artemio. "Evaluation of Alumina Nanofluids and Surfactant Drag Reducing Solutions to Improve Heat Transfer for Aircraft Cooling Systems." University of Dayton / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton154479500350447.
Повний текст джерелаCowley, Adam M. "Hydrodynamic and Thermal Effects of Sub-critical Heating on Superhydrophobic Surfaces and Microchannels." BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6572.
Повний текст джерелаFriso, Enrico. "Thermal effects reduction techniques for the SIMBIO-SYS scientific suite of BepiColombo mission." Doctoral thesis, Università degli studi di Padova, 2010. http://hdl.handle.net/11577/3421562.
Повний текст джерелаIl progetto di ricerca di questa tesi di dottorato è finalizzato a indagare possibili tecniche di riduzione degli effetti termici per la strumentazione scientifica SIMBIO-SYS della missione ESA BepiColombo a Mercurio. SIMBIO-SYS è una suite integrata di strumenti ottici costituita da tre canali: High Resolution Imaging Channel (HRIC), STereo Imaging Channel (STC), Visual and Infrared Hyperspectral Imager (VIHI). SIMBIO-SYS dovrà operare nell'ambiente termicamente ostile di Mercurio. E' quindi necessaria la progettazione di dedicati ed efficaci sistemi di reiezione del calore e di controllo termico per lo strumento. Il problema è stato affrontato con un approccio il più possibile metodologico al fine di individuare gli aspetti cruciali del problema progettuale. Inizialmente si è valutato l’ambiente termico che lo strumento incontrerà durante le fasi operative in orbita attorno a Mercurio. A tal fine è stato sviluppato un modello matematico in grado di valutare, per le possibili stagioni di Mercurio, i flussi solare, di albedo e planetario incidenti su una superficie orbitante attorno al pianeta secondo l’orbita e l’assetto nominali previsti per il satellite. Lo studio ha reso possibile identificare le orbite maggiormente critiche dal punto di vista termico. Il modello matematico implementato può essere applicato anche a studi riguardanti altre missioni di osservazione planetaria e consente di effettuare agevolmente studi di sensibilità dei flussi orbitali incidenti ai parametri orbitali o di assetto. Il modello matematico implementato permette inoltre di valutare l'angolo di incidenza solare rispetto agli assi ottici dei tre strumenti e ha consentito di identificare le condizioni maggiormnete critiche alla illuminazione solare diretta fornendo vincoli di progetto per le geometrie dei paraluce (baffle) degli strumenti. Le geometrie dei baffle della attuale configurazione prevista dal progetto sono state verificate all'ingresso diretto di raggi solari in orbita grazie alla implementazione di algoritmi di ray-cating ed è stato fornito un corrispettivo margine angolare per ciascun baffle. Successivamente sono stati sviluppati dei modelli termici, con approccio a parametri concentrati, dei baffle dei tre canali di SIMBIO-SYS utilizzando il software ESARAD/ESATAN, stimando così le potenze termiche scambiate, la distribuzione delle temperature e le prestazioni del sottosistema in termini di capacità di reiezione del calore. E' stato approfondito lo studio del baffle riflettente di tipo Stavroudis del canale ad alta risoluzione ed è stata individuata la geometria ottimale per la modellazione con gli attuali software commerciali disponibili di analisi termica. Questo studio ha condotto inoltre alla individuazione di criteri per la valutazione delle prestazionidel baffle Stavroudis utili a guidare il progetto di un apparato sperimentale per la caratterizzazione delle prestazioni del baffle.L'attività di ricerca è poi proseguita con il dimensionamento a livello di sistema di un apparato sperimentale finalizzato a riprodurre a terra l'ambiente termico incontrato dallo strumento in orbita attorno Mercurio. Esso è concepito per riprodurre all'interno di una camera termo vuoto l'andamento dei flussi solare e infrarosso incidenti sullo strumento e le interfacce radiative e conduttive della strumentazione con il satellite, tenendo conto della orientazione dello strumento durante il moto orbitale rispetto alle sorgenti di radiazione. I modelli matematici sviluppati e le analisi termiche eseguite hanno fornito le specifiche di progetto dell'apparato sperimentale ed utili dati numerici per la definizione del simulatore a livello di sistema. I metodi di analisi e di progetto sviluppati hanno contribuito alla definizione di efficienti sistemi di riduzione degli effetti termici per la strumentazione SIMBIO-SYS.
Rauthan, Kanishk. "Investigation of surface textures on thermal and pressure drop performance of plate-fin heat exchangers." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2022. https://ro.ecu.edu.au/theses/2597.
Повний текст джерелаHughes, Robert T. "NOx FORMATION IN LIGHT-HYDROCARBON, PREMIXED FLAMES." UKnowledge, 2018. https://uknowledge.uky.edu/me_etds/118.
Повний текст джерелаDonskoi, Eugene. "The mathematical modelling of direct reduction in iron ore/coal composites including the modelling of coal pyrolysis." Thesis, Queensland University of Technology, 2000.
Знайти повний текст джерелаO'Dowd, Devin Owen. "Aero-thermal performance of transonic high-pressure turbine blade tips." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:e7b8e7d0-4973-4757-b4df-415723e7562f.
Повний текст джерелаTimpanaro, Anthony. "Reduction of NOx Emissions in a Single Cylinder Diesel Engine Using SNCR with In-Cylinder Injection of Aqueous Urea." UNF Digital Commons, 2019. https://digitalcommons.unf.edu/etd/876.
Повний текст джерелаLafaye, de Micheaux Téo. "Modélisation des écoulements d’air et des transferts de chaleur dans un camion frigorifique : Etude des performances d’un dispositif de rideau d’air innovant pour le maintien de la chaîne du froid et la réduction des pertes à l’ouverture des portes." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI057.
Повний текст джерелаCold chain safety is a key parameter for urban distribution where the frequent door-opening induces a heat infiltration. In order to reduce heat and mass transfer, air curtain have recently been installed to protect the doorway of refrigerated truck. The aim of this work is to study this type of door insulation. Two CFD numerical models were developed to simulate the temperature and velocity fields in a closed refrigerated truck. These models showed that modifying the blowing velocity does not modify the air flow structure inside the cavity. Different air chutes were modelled. Numerical results demonstrate that the configuration with a convergent and an open duct strongly improves the air renewal. A numerical investigation was performed in order to study heat and mass infiltration rates during the opening. The infiltration flow rate is well predicted by the CFD model, except at the transition between both flow regimes. An experimental truck was equipped with an air curtain setup, composed by an ambient air jet, a cold air jet or a double jet. In parallel, a numerical CFD model was developed to study the influence of various parameters. Experimental and numerical results were found to be in good agreement. The maximum efficiency of the ambient air curtain is reached when the impact point of the jet occurs in the door plane at the ground level. This configuration is only relevant for short opening times. The double air curtain efficiently maintains the temperature homogeneity for short openings. The cold air curtain is the best configuration which strongly limits the temperature increase during the opening and allows important energy savings
Waseem, Abdullah. "Numerical Homogenization and Model Reduction for Transient Heat, Diffusion and coupled Mechanics Problems." Thesis, Ecole centrale de Nantes, 2020. http://www.theses.fr/2020ECDN0028.
Повний текст джерелаIn this thesis computationally efficient numerical homogenization techniques are presented for diffusion phenomena in heterogeneous materials. As a preliminary step, a model reduction for the transient heat diffusion equation is performed at the micro-scale using component mode synthesis, which provides an emergent enriched-continuum description at the macro-scale. Based on the location of the enrichmentvariables, either on the finite element nodes or the quadrature points, two spatial discretization schemes are analyzed for the enrichedcontinuum. The proposed model reduction is also extended to the transient mass diffusion coupled to the mechanics with application to lithium-ion batteries. Chemical potential and strain fields formulation is used which allows the use of standard C0-continuous finite elements. The micro-scale problem, which usually involves an expensive solution of the coupled mass diffusionmechanics problem is now replaced by a set of ordinary differential equations through model reduction. Finally, an alternative model reduction approach using data-driven mechanics is explored. It relies on a direct search and interpolation from a database instead of the solution of a microscopic problem. The database is constructed and stored using the microscopic calculations in an offline stage. It also provides a route to extend the proposed model reduction method to the nonlinear regime
Výravská, Zdeňka. "Vliv stavební konstrukce na tepelnou zátěž prostoru." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226871.
Повний текст джерелаCostini, Pierre. "Applicabilité de la réduction de modèles à la conception aérothermique collaborative des systèmes d'air secondaire des turbomachines." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0109.
Повний текст джерелаA non intrusive method to create surrogate models describing the flow in jet engines’ secondary air system is desired. The resulting model must be integrated in a thermal model describing the whole engine during a complete mission under the wing. This requires the model to use a high number of input and output parameters and to be valid on a broad domain of variation of its parameters. Several approches are explored in this thesis and applied to a simplified turbine cavity :— Surrogate modeling of terms of the ANOVA decomposition of wall fluxes.— Surrogate modeling of wall fluxes combined with an adaptive refinement method exploiting the trajectory followed by the input parameters during the coupling between the metamodel and the structural model.— Dimensionality reduction of the interface data exchanged during the coupling between flow and structure thermal model and surrogate modeling of the resulting reduced coordinate.This last approach leads to good results on the test case considered in this thesis with fixed inlet boundary conditions and then with variations of some of the inlet parameters
Kim, Eui-Jong. "Development of numerical models of vertical ground heat exchangers and experimental verification : domain decomposition and state model reduction approach." Thesis, Lyon, INSA, 2011. http://www.theses.fr/2011ISAL0026/document.
Повний текст джерелаGround-source heat pump systems with vertical ground heat exchangers (GHE) are gaining popularity worldwide for their higher coefficients of performance and lower CO2 emissions. However, the higher initial cost of installing the borehole GHEs is a main obstacle to spread the systems. To reduce the required total GHE length and efficiently operate the systems, various systems such as hybrid ones (e.g. solar heat injection) have recently been introduced. Accurate prediction of heat transfer in and around boreholes of such systems is crucial to avoid costly overdesigns or catastrophic failures of undersized systems as it is for typical GCHP systems. However, unlike the traditional sizing methods, it is increasingly required to take into account detailed borehole configuration and transient effects (e.g. short circuit effects between U-tubes). Many of the existing GHE models have been reviewed. Some of these models have serious limitations when it comes to transient heat transfer, particularly in the borehole itself. Accordingly, the objective of this thesis is to develop a model that is capable to accurately predict thermal behaviors of the GHEs. A precise response to input variations even in a short time-step is also expected in the model. The model also has to account for a correct temperature and flux distribution between the U-tubes and inside the borehole that seems to be important in the solar heat injection case. Considering these effects in 3D with a detailed mesh used for describing the borehole configurations is normally time-consuming. This thesis attempts to alleviate the calculation time using state model reduction techniques that use fewer modes for a fast calculation but predict similar results. Domain decomposition is also envisaged to sub-structure the domain and vary the time-step sizes. Since the decomposed domains should be coupled one another spatially as well as temporally, new coupling methods are proposed and validated particularly in the FEM. For the simulation purpose, a hybrid model (HM) is developed that combines a numerical solution, the same one as the 3D-RM but only for the borehole, and well-known analytical ones for a fast calculation. An experimental facility used for validation of the model has been built and is described. A comparison with the experimental results shows that the relatively fast transients occurring in the borehole are well predicted not only for the outlet fluid temperature but also for the grout temperatures at different depths even in very short time-steps. Even though the current version of 3D-RM is experimentally validated, it is still worth optimizing the model in terms of the computational time. Further simulations with the 3D-RM are expected to be carried out to estimate the performance of new hybrid systems and propose its appropriate sizing with correspondent thermal impacts on the ground. Finally, the development of the model 3D-RM can be an initiation to accurately model various types of GHE within an acceptable calculation time
Dizon, Lucas, and Martin Johansson. "Atrial Fibrillation Detection Algorithm Evaluation and Implementation in Java." Thesis, KTH, Skolan för teknik och hälsa (STH), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-158878.
Повний текст джерелаFörmaksflimmer är en vanlig hjärtrytmrubbning som kännetecknas av en avsaknad eller oregelbunden kontraktion av förmaken. Sjukdomen är en riskfaktor för andra allvarligare sjukdomar och de totala kostnaderna för samhället är betydande. Det skulle därför vara fördelaktigt att effektivisera och förbättra prevention samt diagnostisering av förmaksflimmer. Kliniskt diagnostiseras förmaksflimmer med hjälp av till exempel pulspalpation och auskultation av hjärtat, men diagnosen brukar fastställas med en EKG-undersökning. Det finns idag flertalet algoritmer för att detektera arytmin genom att analysera ett EKG. En av de vanligaste metoderna är att undersöka variabiliteten av hjärtrytmen (HRV) och utföra olika sorters statistiska beräkningar som kan upptäcka episoder av förmaksflimmer som avviker från en normal sinusrytm. I detta projekt har två metoder för att detektera förmaksflimmer utvärderats i Matlab, en baseras på beräkningar av variationskoefficienten och den andra använder sig av logistisk regression. EKG som kommer från databasen Physionet MIT används för att träna och testa modeller av algoritmerna. Innan EKG-signalen kan användas måste den behandlas för att ta bort olika typer av brus och artefakter. Vid test av algoritmen med variationskoefficienten blev resultatet en sensitivitet på 91,38%, en specificitet på 93,93% och en noggrannhet på 92,92%. För logistisk regression blev sensitiviteten 97,23%, specificiteten 93,79% och noggrannheten 95,39%. Algoritmen med logistisk regression presterade bättre och valdes därför för att implementeras i Java, där uppnåddes en sensitivitet på 91,31%, en specificitet på 93,47% och en noggrannhet på 95,25%.
Dello, Ioio Gennaro. "An improved data reduction technique for heat transfer measurements in hypersonic flows." Tesi di dottorato, 2008. http://www.fedoa.unina.it/3039/1/delloioio_2008.pdf.
Повний текст джерелаClark, Jordan Douglas. "Modeling of transport processes for the reduction of energy use in commercial buildings." 2013. http://hdl.handle.net/2152/23146.
Повний текст джерелаtext
Kuo-Yeh, Shen. "Trajectory Piecewise Linear Model Order Reduction Technique for Nonlinear Micro Heat Transfer Modeling." 2006. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-1807200616261600.
Повний текст джерелаShen, Kuo-Yeh, and 沈國曄. "Trajectory Piecewise Linear Model Order Reduction Technique for Nonlinear Micro Heat Transfer Modeling." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/75346026508499617077.
Повний текст джерела國立臺灣大學
機械工程學研究所
94
ABSTRACT In this paper, we present a nonlinear heat-transfer macromodeling technique using the trajectory piecewise linear model order reduction (TPWLMOR) method. A 3D nonlinear heat-transfer model, which is capable of accounting for the temperature-dependent material properties as well as radiation effect, is implemented using the finite difference method (FDM). The numerical models generated by the FDM are reduced into compact models using the TPWLMOR technique, which is based on the concept of piecewise-linear approximation and an Arnoldi-based model order reduction (MOR) algorithm. Nonlinear macromodeling case studies of different MEMS thermal devices are demonstrated using the TPWLMOR technique. The calculated steady and transient characteristics of the thermal devices are discussed. In terms of computational cost, the TPWLMOR models are at least 2 orders of magnitude faster than the original nonlinear full-meshed models with negligible compromise in accuracy. The simulated results by the TPWLMOR models are also verified with the experimentally measured results. Keywords: model order reduction, piecewise linear, macromodel, system-level modeling, Arnoldi algorithm
Chang, Y. H., and 張堯翔. "Model Reduction of Porous Media Heat Transfer with Uncertain Boundary Conditions and Distributed Parameters." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/54832940283137367917.
Повний текст джерела國立中正大學
機械系
90
This thesis provides a methodology of model reduction of the heat transfer of porous media with uncertain boundary conditions and distributed parameters. It focuses on the identification of uncertain parameters, boundary conditions as well as the process of dynamical database and simplification of dynamical model, which build an important bridge from the complexity of porous media heat transfer to the availability of online operation. The kernel methodology is to formulate the governing equation and boundary conditions into a single state-space description. A set of Eigen-bases is therefore found, and a truncated model is obtained after the uncertain parameters and boundary conditions are identified in the frequency domain. A series of experiment via MATLAB simulation is performed in order to verify the methodology.
"Modeling and Characterization of Ammonia Injection and Catalytic Reduction in Kyrene Unit-7 HRSG." Master's thesis, 2011. http://hdl.handle.net/2286/R.I.14496.
Повний текст джерелаDissertation/Thesis
M.S. Mechanical Engineering 2011
Kim, Tae Jin active 21st century. "Pressure and thermal effects on superhydrophobic friction reduction in a microchannel flow." Thesis, 2013. http://hdl.handle.net/2152/26078.
Повний текст джерелаtext
De, Villiers Emil E. "Tempo van direkte reduksie van komposiet korrels (Afrikaans)." Diss., 1998. http://hdl.handle.net/2263/30486.
Повний текст джерелаDissertation (M Eng (Metallurgical Engineering))--University of Pretoria, 2006.
Materials Science and Metallurgical Engineering
unrestricted
"Classical symmetry reductions of steady nonlinear one-dimensional heat transfer models." Thesis, 2015. http://hdl.handle.net/10539/16865.
Повний текст джерелаWe study the nonlinear models arising in heat transfer in extended surfaces (fins) and in solid slab (hot body). Here thermal conductivity, internal generation and heat transfer coefficient are temperature dependent. As such the models are rendered nonlinear. We employ Lie point symmetry techniques to analyse these models. Firstly we employ Lie point symmetry methods and determine the exact solutions for heat transfer in fins of spherical geometry. These solutions are compared with the solutions of heat transfer in fins of rectangular and radial geometries. Secondly, we consider models describing heat transfer in a hot body, for example, a plane wall. We then employ the preliminary group classification methods to determine the cases of the arbitrary function for which the principal Lie algebra is extended by one. Furthermore we the exact solutions.