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Thèses sur le sujet « Energy stratification »

Auteur : Grafiati

Publié le 2 juin 2025

Mis à jour le 31 juillet 2025

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1

Lawrie, Andrew. "Rayleigh-Taylor mixing : confinement by stratification and geometry." Thesis, University of Cambridge, 2010. https://www.repository.cam.ac.uk/handle/1810/225125.

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Rayleigh-Taylor instability has been an area of active research in fluid dynamics for the last twenty years, but relatively little attention has been paid to the dynamics of problems where Rayleigh-Taylor instability plays a role, but is only one component of a more complex system. Here, Rayleigh-Taylor instability between miscible fluids is examined in situations where it is confined by various means: by geometric restriction, by penetration into a stable linear stratification, and by impingement on a stable density interface. Water-based experiments are modelled using a variety of techniques

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2

Smyth, Mervyn A. "Design and development of a heat retaining integrated collection/storage solar water heater." Thesis, University of Ulster, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264693.

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Rodney, J. T. "The effects of stratification and coastline geometry on the geographical localisation of shelf wave energy." Thesis, University College London (University of London), 2012. http://discovery.ucl.ac.uk/1349172/.

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Variations in shelf geometry mean that a coastal-trapped wave (CTW) mode can propagate within some finite length of shelf but be evanescent outside these regions. These disturbances will be denoted here as localised coastal-trapped waves (ℓCTWs). The subsequent motions produced by such localised variations in shelf geometry, i.e. wave propagation, wave trapping and eddy generation, are discussed in both the coastal-trapped wave (baroclinic) and continental shelf wave (barotropic) limits. Firstly, localised continental shelf waves (ℓCSWs) trapped by local variations in coastline curvature, shel

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4

Pentagna, Robert Pasquale Paulo [UNESP]. "Modelo matemático para análise de problemas de estocagem de líquidos que apresentam estratificação térmica." Universidade Estadual Paulista (UNESP), 2004. http://hdl.handle.net/11449/90813.

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Made available in DSpace on 2014-06-11T19:24:47Z (GMT). No. of bitstreams: 0 Previous issue date: 2004-08-22Bitstream added on 2014-06-13T20:47:19Z : No. of bitstreams: 1 pentagna_rpp_me_bauru_prot.pdf: 1054031 bytes, checksum: c2f515f7ab29cf3aa3f199133c8d8d15 (MD5)<br>outros - empresas<br>Foi desenvolvido um modelo matemático para descrever o processo de estocagem de energia via estratificação térmica de líquido em um tanque. Neste modelo foi considerado um balanço de energia para o sistema de estocagem e proposto um modelo matemático unidimensional e transiente capaz de descrever o históri

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5

Armstrong, Peter Michael. "Enhancing the energy storage capability of electric domestic hot water tanks." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:af140a2c-aab4-4fc9-8709-6f9474079cd5.

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Electric hot water tanks play a pivotal role as demand response assets within the UK's energy system by storing heat when energy is inexpensive and delivering domestic hot water when it is required. This role will become increasingly important if non-dispatchable renewable energy sources are to play a bigger part in the energy mix. Historically, the design standards relating to hot water tanks have focused primarily on minimising heat losses. However, in addition to preserving energy, a hot water tank should preserve the availability of heat above a useful temperature for as long as possible t

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6

Nyberg, Roland. "The Inclusion of Stratification in Wind Analysis; A New Linearized Code." Thesis, KTH, Strömningsmekanik och Teknisk Akustik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-289627.

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Wind energy is rapidly growing around the world as non-renewable energy sources are being phased out. To maximize the energy production, it is crucial to construct new wind turbines at locations where the average wind speed is high. An accurate wind assessment of a new potential site is thus essential in the development of new wind farms. Linearized codes (codes based on simplified models) such as Orfeus and WAsP have seen frequent use in the wind industry as a tool for wind resource assessment since they offer reasonable accuracy at a relatively low computational cost. A major issue with the

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Pentagna, Robert Pasquale Paulo. "Modelo matemático para análise de problemas de estocagem de líquidos que apresentam estratificação térmica /." Bauru : [s.n.], 2004. http://hdl.handle.net/11449/90813.

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Orientador: Alcides Padilha<br>Banca: Ricardo Fortes de Miranda<br>Banca: Vicente Luiz Scalon<br>Resumo: Foi desenvolvido um modelo matemático para descrever o processo de estocagem de energia via estratificação térmica de líquido em um tanque. Neste modelo foi considerado um balanço de energia para o sistema de estocagem e proposto um modelo matemático unidimensional e transiente capaz de descrever o histórico dos perfis de temperatura do líquido e da parede do reservatório durante a operação de carregamento dinâmico. O modelo matemático foi discretizado através da técnica de diferença finita

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8

Adua, Lazarus. "The Salience of Stratification, Lifestyle and Residential Energy Efficiency Improvement in the Climate Change Discourse and Policy: Implications for Environmental Justice." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243888108.

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9

Kayserilioglu, Yavuz Selim. "Heat Removal From A Large Scale Warm Water Storage." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605359/index.pdf.

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ABSTRACT HEAT REMOVAL FROM A LARGE SCALE WARM WATER STORAGE Kayserilioglu, Yavuz Selim M.S., Department of Mechanical Engineering Supervisor: Prof. Dr. R&uuml<br>knettin Oskay August 2004, 88 Pages A preliminary experimental study was performed in order to investigate the charging and heat removal characteristics of a sensible heat storage. Two sets of experiments were performed at two aspect ratios. Heat removal processes of these two sets were different while the charging processes were similar. In the first set of experiments, after the charging of the storage unit with relatively warm w

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10

Santos, Guilherme Henrique Sempionato Souza. "Análise numérica de um sistema integrado coletor solar/armazenador térmico /." Bauru : [s.l.], 2007. http://hdl.handle.net/11449/136670.

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Orientador: Alcides Padilha<br>Banca: Vicente Luiz Scalon<br>Banca: Ricardo Fortes de Miranda<br>Resumo: Este estudo apresenta uma análise numérica dos campos de temperaturas e velocidades d'água durante seu processo de aquecimento via calor sensível no interior de um armazenador térmico cilíndrico, aquecido lateralmente e adiabático em seu topo e base, visando o estudo da condição de operação de um aquecedor de água coletor solar-armazenador integrados (ICSSWH - Integrated Collector-Storage Water Heater). Em uma segunda análise a influência de um defletor interno é estudada pela definição dos

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11

Santos, Guilherme Henrique Sempionato Souza [UNESP]. "Análise numérica de um sistema integrado coletor solar/armazenador térmico." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/136670.

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Made available in DSpace on 2016-04-01T17:54:39Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-08-10. Added 1 bitstream(s) on 2016-04-01T18:00:20Z : No. of bitstreams: 1 000505772.pdf: 2673100 bytes, checksum: 0b1ec10e248621594ebb61317344d2af (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Este estudo apresenta uma análise numérica dos campos de temperaturas e velocidades d'água durante seu processo de aquecimento via calor sensível no interior de um armazenador térmico cilíndrico, aquecido lateralmente e adiabático em seu topo e base, visando o estudo

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12

Avallone, Elson [UNESP]. "Estudo de um coletor solar, tipo tubo evacuado modificado, utilizando um concentrador cilíndrico parabólico (CPC)." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/152135.

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13

Lee, Allison Marie. "An Experimental and Theoretical Investigation of Internal Wave Kinetic Energy Density in Variable Stratifications." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7737.

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Internal waves are generated in a fluid if the density increases continuously with depth. The variation in density with depth, or stratification, defines the natural frequency of the fluid N. Two common examples of stratified fluids are the ocean and atmosphere; internal waves are generated continuously in both mediums. Although there are many internal wave generation mechanisms, one common and frequently studied method is tidal flow over oceanic bathymetry. If the local natural frequency of the water near the topography is greater than the tidal frequencyω, internal waves will be generated

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14

Boury, Samuel. "Energy and Buoyancy Transport by Inertia-Gravity Waves in Non-Linear Stratifications. Application to the Ocean." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEN014.

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Les ondes gravito-inertielles contribuent au transport global d’énergie et d’impulsion dans les océans, et elles jouent un rôle crucial dans le mélange stratifié par des processus non-linéaires transférant l'énergie d'une échelle à l'autre, comme la génération de super-harmoniques ou l'instabilité résonante triadique. Ces ondes sont d'une importance capitale pour l'océan Arctique, et plus particulièrement le transport d'énergie par les ondes internes créées par des tempêtes à la surface de l'océan. En raison de la fonte croissante des glaces au cours des dernières décennies, la surface de l'oc

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15

Matulka, Anna Magdalena. "Turbulent structure in environmental flows: effects of stratification and rotation." Doctoral thesis, Universitat Politècnica de Catalunya, 2010. http://hdl.handle.net/10803/52809.

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Several series of experiments in stratified and in rotating/stratified decaying flows after a grid is used to stir the two layer stable fluid brine and fresh water set up. We measure by comparing the gained potential energy with the available kinetic energy AKE, the relative efficiency of mixing. The experiments in stratified rotating flows with grid driven turbulence were both periodic (quasi stationary) and non-monotonic (decaying) forcing. This thesis compares experimental, numerical and field observations on the structure and Topology of the Stratified Rotating Flows as well as their d

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16

Myrtrøen, Ole-Jørgen Feiring. "Vertical Stratification in a Ventilated Space : Comparison of Theoretical Predictions to Experimental Results from a Water Scale Model." Thesis, Norwegian University of Science and Technology, Department of Energy and Process Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-8841.

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<p>This study investigates the behaviour of a vertically distributed source of buoyancy on the vertical stratification in a ventilated space, an important factor for determining indoor comfort when using displacement ventilation. A new theory describing the behaviour of this buoyancy source in a ventilated space was presented previous to this work, but experimental results were required in order to validate the theoretical and numerical modelling. The behaviour of this source of buoyancy on the stratification in a ventilated space is studied for a mechanically ventilated at steady-state and f

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17

Findeisen, Fabian. "Radiale Diﬀusoren in Warmwasserspeichern: Einﬂuss des Beladesystems auf Strömungsverhalten und Schichtungsqualität". Technische Universität Chemnitz, 2018. https://monarch.qucosa.de/id/qucosa%3A21083.

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Radiale Diffusoren beeinflussen signifikant die Qualität der thermischen Schichtung in Warmwasserspeichern. Um die Effizienz der Energiespeicherung zu verbessern, ist das Verständnis des komplexen Strömungsverhaltens notwendig. Diese Arbeit liefert Grundlagen zur Beschreibung der auftretenden Effekte und stellt ein geeignetes CFD-Simulationsmodell vor. Als Untersuchungsobjekt dient eine neuartige Speicherkonstruktion, wobei der Radialdiffusor direkt an einer schwimmenden Decke montiert ist. Vorteile dieser Anordnung werden aufgezeigt, die auftretenden Strömungseffekte beschrieben sowie der Ein

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18

AMIRAT, MADJID. "Contribution a l'etude des serres associees a un habitat : etude et modelisation des transferts thermiques, realisation d'une cellule d'essai." Paris 6, 1986. http://www.theses.fr/1986PA066542.

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19

Rysanek, Adam M. "Second Law Performance Analysis of a Large Thermal Energy Storage Vessel using CFD." Thesis, 2009. http://hdl.handle.net/1974/5178.

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This work is an example of a CFD-assisted design and characterization process for thermal energy storage vessels. A general modeling technique for future works is also proposed. The Short-Term Thermal Storage (STTS) tanks at the Drake Landing Solar Community (DLSC) were used as the principal case study. The performance characterization of the STTS tanks and the evaluation of other tank designs were made under solar charging conditions and for the STTS “Hot Tank” only. Three sets of simulations were undertaken for each tank design, each representing a different state of inlet conditions reflect

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Cruickshank, CYNTHIA. "Evaluation of a Stratified Multi-tank Thermal Storage for Solar Heating Applications." Thesis, 2009. http://hdl.handle.net/1974/1969.

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A novel multi-tank thermal energy storage (TES) was evaluated experimentally and numerically. The multi-tank storage is based on the interconnection of standard hot water storage tanks by a single charge flow loop. Each tank is charged through a thermosyphon loop and natural convection heat exchanger (NCHE). Both series- and parallel-connected configurations were investigated and results show that high degrees of stratification can occur. To predict the performance of the series- and parallel-connected multi-tank TES, a numerical model was developed and implemented in the TRNSYS simulation e

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Advaith, S. "Density Stratified Thermal Energy Storage System and Associated Fluid Dynamic Perturbations." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4411.

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The hunger of humankind for energy has reached unprecedented levels with the ever-rising industrialization and global population surge. We are witnessing a global economic evolution towards a clean, affordable, sustainable and reliable sources of energy which could transform our lives and the planet itself. The mismatch between the supply of solar energy which is one among the most promising renewable energy and the demand for its utilization, compel us to incorporate a solar energy storage. Such storage systems are essential in various fields including power generation sectors like power pla

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(8081558), Khushal Ashok Bhatija. "Particles in a linearly stratified fluid." Thesis, 2019.

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The settling of spherical and cylindrical particles in a linearly stratified fluid is investigated using experiments. The double-tank method is used to generate a linear stratification with a red colored dye homogeneously mixed in the heavy water tank. As a result of feeding the stratification using dyed heavy water, the concentration of dye varies with depth in the experiment tank. A powerful back-light and a digital camera are used to record the events. Assuming the concentration of dye is directly proportional to density of fluid, Beer-Lambert's law is used to generate a calibration between

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