Thematische Bibliographien / Thermal CFT

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Auswahl der wissenschaftlichen Literatur zum Thema „Thermal CFT“

Autor: Grafiati

Veröffentlicht am 23. November 2024

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Zeitschriftenartikel zum Thema "Thermal CFT"

CHOWDHURY, BORUN D. „BLACK HOLES VERSUS FIREWALLS AND THERMO-FIELD DYNAMICS“. International Journal of Modern Physics D 22, Nr. 12 (Oktober 2013): 1342011. http://dx.doi.org/10.1142/s021827181342011x.

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In this paper, we examine the implications of the ongoing black holes versus firewalls debate for the thermo-field dynamics of black holes by analyzing a conformal field theory (CFT) in a thermal state in the context of anti-de Sitter/CFT. We argue that the thermo-field doubled copy of the thermal CFT should be thought of not as a fictitious system, but as the image of the CFT in the heat bath. In case of strong coupling between the CFT and the heat bath, this image allows for free infall through the horizon and the system is described by a black hole. Conversely, firewalls are the appropriate dual description in case of weak interaction of the CFT with its heat bath.

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Dutta, Suvankar, und Rajesh Gopakumar. „Free fermions and thermal AdS/CFT“. Journal of High Energy Physics 2008, Nr. 03 (06.03.2008): 011. http://dx.doi.org/10.1088/1126-6708/2008/03/011.

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Dusling, Kevin, Derek Teaney, Clint Young, Johanna Erdmenger, Matthias Kaminski und Felix Rust. „Quarkonium transport in thermal AdS/CFT“. Journal of High Energy Physics 2008, Nr. 10 (27.10.2008): 098. http://dx.doi.org/10.1088/1126-6708/2008/10/098.

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Ohya, Satoshi. „Intertwining operator in thermal CFTd“. International Journal of Modern Physics A 32, Nr. 02n03 (25.01.2017): 1750006. http://dx.doi.org/10.1142/s0217751x17500063.

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It has long been known that two-point functions of conformal field theory (CFT) are nothing but the integral kernels of intertwining operators for two equivalent representations of conformal algebra. Such intertwining operators are known to fulfill some operator identities — the intertwining relations — in the representation space of conformal algebra. Meanwhile, it has been known that the S-matrix operator in scattering theory is nothing but the intertwining operator between the Hilbert spaces of in- and out-particles. Inspired by this algebraic resemblance, in this paper, we develop a simple Lie-algebraic approach to momentum-space two-point functions of thermal CFT living on the hyperbolic space–time [Formula: see text] by exploiting the idea of Kerimov’s intertwining operator approach to exact S-matrix. We show that in thermal CFT on [Formula: see text], the intertwining relations reduce to certain linear recurrence relations for two-point functions in the complex momentum space. By solving these recurrence relations, we obtain the momentum-space representations of advanced and retarded two-point functions as well as positive- and negative-frequency two-point Wightman functions for a scalar primary operator in arbitrary space–time dimension [Formula: see text].

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Gan, Wen-Cong, Fu-Wen Shu und Meng-He Wu. „Thermal geometry from CFT at finite temperature“. Physics Letters B 760 (September 2016): 796–99. http://dx.doi.org/10.1016/j.physletb.2016.07.073.

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LEMOS, JOSÉ P. S., und VITOR CARDOSO. „RADIATION GENERATED BY THE INFALL OF A SCALAR PARTICLE IN A SCHWARZSCHILD–ANTI-DE SITTER BACKGROUND“. International Journal of Modern Physics A 17, Nr. 20 (10.08.2002): 2767. http://dx.doi.org/10.1142/s0217751x02011941.

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In the context of the AdS/CFT conjecture1, a Schwarzschild-anti-de Sitter (SAdS) black hole may be looked at as a thermal state in the CFT. Perturbing the black hole corresponds in the CFT to perturb the thermal state. We considered an important specific perturbation - the radial infall of a small test particle coupled to a scalar field into a SAdS black hole. We computed the spectra, waveforms and total scalar energy radiated during this process. For small black holes, the spectra is dominated by a resonance, and the waveform by quasinormal ringing2,3,4. For large black holes we find that the waveform quickly settles down to its final zero value, always in a quasinormal way. The approach to thermal equilibrium in the CFT is therefore dictated by the lowest quasinormal frequency. We also commented on the interpretation of the bulk process when viewed from the brane: to the black hole corresponds a thermal bath, to the infalling probe corresponds an expanding bubble, and to the scalar field waves correspond particles decaying into bosons of the associate operator of the gauge theory. For more details see5,6.

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Li, Lingjie, Dongna Li, Xiaoming Zhu, Kun Zhang und Yanhu Mu. „Freeze-Thaw Resistance of Thermal Insulating Materials Used in Cold Regions Engineering: A State-of-the-Art Review“. Geofluids 2022 (23.09.2022): 1–11. http://dx.doi.org/10.1155/2022/9015055.

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Thermal insulating materials (TIMs) are widely used in roadways, tunnels, airfields, pipeline systems, and buildings in cold regions to prevent infrastructure from freeze damages and reduce energy consumption. During the period of use in cold regions, however, seasonal freeze-thaw actions can cause degradation of thermal and mechanical properties of TIMs and even malfunctions. Lots of research has been carried out on the durability of TIMs under cyclic freeze-thaw (CFT), but comprehensive reviews are scarce at present. Based on a literature review, the state and development of the test apparatus, temperature controls for the CFT test, and changes in the thermal and mechanical characteristics of TIMs during the CFT operations were summarized in this study. The review shows that the CFT can damage the TIMs’ microstructure, which will result in an increase in the materials’ thermal conductivity and water absorption rate with a decrease in their mechanical strength. However, since the application scenarios of TIMs are various, there are significant differences in previous researches, especially the test conditions. These differences limited the applicability of the test results and make a barrier among researchers and engineers. Thus, a unified test method for the durability of TIMs under the CFTs should be established in the future.

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Pires, Tiago A. de C., João Paulo C. Rodrigues und Jose J. R. Silva. „Numerical analysis on circular concrete-filled tubular columns subjected to fire“. Journal of Structural Fire Engineering 10, Nr. 1 (28.02.2019): 2–23. http://dx.doi.org/10.1108/jsfe-06-2017-0036.

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Purpose Nowadays, circular concrete-filled tubular (CFT) columns are largely used in construction because of structural and architectural advantages such as high load bearing capacity and aesthetic appearance. The behavior of CFT columns at ambient and high temperatures is good; however, there are problems related to their behavior in fire when inserted in a real building structure, as for example, the influence of the restraining to thermal elongation that have to be addressed in order to improve their design. This study aims to present the results of a numerical study on the behavior of CFT columns with restrained thermal elongation in case of fire. Design/methodology/approach The parameters tested in the numerical simulations included column slenderness, load level, surrounding structure stiffness and steel reinforcement ratio. A sequentially coupled thermal stress analysis was carried out. The numerical model was validated with results from a large series of fire resistance tests carried out at Coimbra University, in Portugal. From these, simple equations to evaluate CFT column critical times were derived. Findings The results were also compared with the ones obtained from the current EN 1994-1-2:2005 simplified calculation and tabulated data methods. For the analyzed cases, it was verified that, while the simplified calculation method led to safe results on the evaluation of the fire resistance of CFT columns with restrained thermal elongation, the tabulated data method led, in certain cases, to unsafe results. This research showed also lower critical times than those from literature on similar type of columns. Originality/value The influence of the stiffness of the surrounding structure on the behavior of CFT columns subjected to fire was not yet clear in the major part of the studies already carried out. So, this paper has the originality to consider this parameter in the numerical simulations of this type of columns.

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Cao, Xuanmin, Lian Liu und Hui Liu. „Thermal R-current correlators from AdS/CFT correspondence“. Journal of Physics G: Nuclear and Particle Physics 41, Nr. 5 (26.02.2014): 055004. http://dx.doi.org/10.1088/0954-3899/41/5/055004.

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Son, Dam T., und Derek Teaney. „Thermal noise and stochastic strings in AdS/CFT“. Journal of High Energy Physics 2009, Nr. 07 (06.07.2009): 021. http://dx.doi.org/10.1088/1126-6708/2009/07/021.

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Dissertationen zum Thema "Thermal CFT"

Štikonas, Andrius. „Entanglement entropy of locally perturbed thermal systems“. Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/28910.

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In this thesis we study the time evolution of Rényi and entanglement entropies of thermal states in Conformal Field Theory (CFT). These quantities are usually hard to compute but Ryu-Takayanagi (RT) and Hubeny-Rangamani-Takayanagi (HRT) proposals allow us to find the same quantities using calculations in general relativity. We will introduce main concepts of holography, quantum information and conformal field theory that will be used to derive the results of this thesis. In the first part of the thesis, we explicitly compute entanglement entropy of the rotating BTZ black hole by directly applying HRT proposal and finding lengths of spacelike geodesics. Rényi entropy of thermal state perturbed by a local quantum quench is computed by mapping correlators on two glued cylinders to the plane for field theory containing a single free boson and for 2d CFTs in the large c limit. We consider Thermofield Double State (TFD) which is an entangled state in direct product of two 2D CFTs. It is conjectured to be holographically equivalent to the eternal BTZ black hole. TFD state is perturbed by a local quench in one CFT and mutual information between two intervals in two CFTs is computed. We find when mutual information vanishes and interpret this as scrambling time, i.e. time scale required for the system to thermalize. This field theory result is modelled with a massive free falling particle in the BTZ black hole. We have computed the back-reaction of the particle on the metric of BTZ and used RT proposal to find holographic entanglement entropy. Finally, we generalize this calculation to the case of rotating BTZ with inner and outer horizons. It is dual to the CFT with different temperatures for left and right moving modes. We calculate mutual information and scrambling time and find exact agreement between results in the gravity and those in the CFT.

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Vilatte, Matthieu. „Adventures in (thermal) Wonderland“. Electronic Thesis or Diss., Institut polytechnique de Paris, 2024. https://theses.hal.science/tel-04791687.

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Le travail que nous présentons dans cette thèse est structuré autour de la notion de théorie des champs et de géométrie, qui sont appliquées à la gravité et la thermalisation.En gravité, notre travail donne un éclairage nouveau sur la structure asymptotique du champ gravitationnel dans le contexte des espace-temps asymptotiquement plats, ceci en utilisant l'information codée sur leur bord conforme. Ce dernier est une hypersurface de genre lumière sur laquelle émerge la physique carrollienne au lieu de la physique relativiste. Une structure carrollienne sur une variété est constituée une métrique dégénérée et un champ de vecteurs couvrant le noyau de cette dernière. Ce vecteur sélectionne une direction particulière qui peut être le point de départ de la description des structures carrolliennes dans un cadre séparé. Nous développons d'abord la géométrie carrollienne, y compris une étude complète des connexions et isométries (conformes). Des actions effectives peuvent vivre sur un arrière-plan carrollien. Les moments canoniques conjugués à la géométrie ou à la connexion peuvent être définis, et la variation de l'action donnera leurs équations de conservation, à partir desquelles les charges isométriques peuvent être bâties.La physique carrollienne émerge également lorsque la vitesse de la lumière tend vers zéro. Cette limite donne généralement plus de descendants carrolliens que ce qui est attendu après une analyse intrinsèque, comme le montrent les exemples explicites des fluides carrolliens, des champs scalaires carrolliens (pour lesquels deux actions, électrique et magnétique, apparaissent dans la limite) et du tenseur de Cotton carrollien. La richesse de la limite est due à sa possibilité de décrire plus de degrés de liberté, ce qui s'avère être un outil fondamental dans l'étude de la relation entre les espace-temps asymptotiquement anti de Sitter et plats.Les espace-temps asymptotiquement plats peuvent être écrits comme une expansion infinie dans une jauge covariante par rapport à leur bord nul. Cette légère extension de la jauge de Newman-Unti est également valable dans AdS, ce qui permet de prendre la limite plate dans le bulk, équivalente à la limite carrollienne sur le bord. Nous démontrons que l'espace des solutions infini des espace-temps Ricci-plat provient en fait du développement en série de Laurent du tenseur énergie-impulsion d'AdS. Ces répliques obéissent à chaque ordre une dynamique carrollienne (lois de flux). Dans le cadre des espaces algébriquement spéciaux de Petrov (pour lesquels le développement infinie se resomme), nous utilisons les lois de flux carrolliennes ainsi que la conservation des tenseurs énergie-impulsion et de Cotton pour construire, du point de vue du bord, deux tours duales de charges du bulk. Parmi elles, nous retrouvons l'expansion mutipolaire de la masse et du moment angulaire pour la famille Kerr-Taub-NUT. La jauge covariante est également le cadre approprié pour dévoiler l'action des symétries cachées de la gravité sur le bord nul. Dans ce travail, nous étudions le cas de la symétrie SL(2,R) d'Ehlers.Du côté de la théorie thermique des champs, nous travaillons sur l'ensemble minimal de données nécessaires pour les décrire à température finie. Alors qu'à température infinie toutes les valeurs moyennes des opérateurs primaires s’annulent, leurs valeurs non nulle dans le cas thermique constituent les données supplémentaires qu'il faut calculer pour caractériser la théorie. Les simulations numériques, la dualité avec un trou noir dans AdS ou une analyse spectrale sont généralement les méthodes employées pour trouver la valeur de ces coefficients. Notre travail propose une nouvelle approche à ce problème en montrant, à partir de deux oscillateurs harmoniques couplés, que ces coefficients sont en fait liés à des graphes conformes de théories de type fishnet. A partir de cette observation, nous avons établi une correspondance entre les fonctions de partition thermique et ces graphes
The work we present in this thesis is structured around the concepts of field theories and geometry, which are applied to gravity and thermalisation.On the gravity side, our work aims at shedding new light on the asymptotic structure of the gravitational field in the context of asymptotically flat spacetimes, using information encoded on the conformal boundary. The latter is a null hypersurface on which Carrollian physics instead of relativistic physics is at work. A Carroll structure on a manifold is a degenerate metric and a vector field spanning the kernel of the latter. This vector selects a particular direction which can be the starting point for describing Carroll structures in a split frame. We first elaborate on the geometry one can construct on such a manifold in this frame, including a comprehensive study of connections and (conformal isometries). Effective actions can be defined on a Carrollian background. Canonical momenta conjugate to the geometry or the connection are introduced, and the variation of the action shall give their conservation equations, upon which isometric charges can be reached.Carrollian physics is also known to emerge as the vanishing speed of light of relativistic physics. This limit usually exhibits more Carrollian descendants than what might be expected from a naive intrinsic analysis, as shown in the explicit examples of Carrollian fluids, Carrollian scalar fields (for which two actions, electric and magnetic arise in the limit) and the Carrollian Chern-Simons action. The richness of the limiting procedure is due to this versatility in describing a palette of degrees of freedom. This turns out to be an awesome tool in studying the relationship between asymptotically anti de Sitter (AdS) and flat spacetimes.Metrics on asymptotically flat spacetimes can be expressed as an infinite expansion in a gauge, covariant with respect to their null boundaries. This slight extension of the Newman-Unti gauge is shown to be valid also in AdS, which allows to take the flat limit in the bulk i.e. the Carrollian limit on the boundary, while preserving this covariance feature. We demonstrate that the infinite solution space of Ricci-flat spacetimes actually arises from the Laurent expansion of the AdS boundary energy-momentum tensor. These replicas obey at each order Carrollian dynamics (flux/balance laws). Focusing our attention to Petrov algebraically special spacetimes (for which the infinite expansion resums), we use the Carrollian flux/balance laws together with the conservation of the energy-momentum and Cotton tensors to build two dual towers of bulk charges from a purely boundary perspective. Among them we recover the mass and angular momentum mutipolar moments for the Kerr-Taub-NUT family. The covariant gauge is also the appropriate framework to unveil the action of hidden symmetries of gravity on the null boundary. In this thesis we study exhaustively the case of Ehlers' $SL(2,mathbb{R})$ symmetry.On the side of thermal field theory we see that while at infinite temperature a CFT is described by its spectrum and the OPE coefficients, additional data is needed in the thermal case. These are the average values of primary operators, completely determined up to a constant coefficient. Numerical simulations, duality with black-hole states in AdS or spectral analyses are the methods usually employed to uncover the latter. Our work features a new breadth. Starting from two coupled harmonic oscillators, we show that they are related to conformal ladder graphs of fishnet theories. This observation is the first step for setting a new correspondence between thermal partition functions and graphs

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Somarathne, Shini. „Dynamic thermal modelling using CFD“. Thesis, Brunel University, 2003. http://bura.brunel.ac.uk/handle/2438/5523.

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Buildings expend vast quantities of energy, which has a detrimental impact on the environment. Buildings systems are often oversized to cope with possible extreme environmental conditions. Building simulation provides an opportunity to improve building thermal design, but the available tools are typically used in combination in order to overcome their individual deficiencies. Two such tools, often used in tandem are computational fluid dynamics (CFD) and dynamic thermal modelling (DTM). DTM provides a coarse analysis, by considering external and internal thermal conditions over a building (including its fabric) over time. CFD is usually used to provide steady state analysis. Boundary conditions typically in the form of surface temperatures are manually input from DTM into CFD. CFD can model buildings dynamically, but is not commonly used, since solving for hugely different time constants of solid and air pose significant limitations, due to data generated and time consumed. A technique is developed in this study to tackle these limitations. There are two main strands to the research. DTM techniques had to be incorporated into CFD, starting from first principles of modelling heat transfer through solid materials. These were developed into employing the use of functions such as the 'freeze flow' function (FEF) and the 'boundary freeze' function (BFF) in combination with a time-varying grid schedule to model solids and air simultaneously. The FFF pauses the solution of all governing equations of fluid flow, except temperature. The BFF can be applied to solid boundaries to lock their temperatures whilst all other equations are solved. After extensive research the established DTM-CFD Procedure eventually used the FEF and BFF with transient periods and steady state updates, respectively. The second strand of research involved the application of the DTM-CFD Procedure to a typical office space over a period of 24-hours. Through inter-model comparisons with a fully transient simulation, the DTM-CFD Procedure proved to be capable of providing dynamic thermal simulations 16.4% more efficiently than a typical CFD code and more accurately than a typical DTM code. Additional research is recommended for the further improvement of the DTM-CFD Procedure.

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Forster, Robin Norman George. „CFD modelling of vortex combustors“. Thesis, University of Surrey, 1999. http://epubs.surrey.ac.uk/770204/.

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This dissertation examines the suitability of Computational Fluid Dynamics (CFD) modelling for the production of realistic flowfields and temperature fields within a series of vortex combustion chambers of differing geometries and operating under various conditions. Initial validation of the CFD predictions was obtained through modelling of a series of isothermal vortex chambers for which a comprehensive set of experimental data was available. It was observed that CFD did indeed produce representative flowfield predictions for chambers of various geometries and operating conditions. A vortex unit used for the incineration of sewage sludge (US Navy Waste Incinerator) was subsequently investigated, and it was shown that due to the high moisture content of the waste material used, temperature profiles obtained with a modified coal combustion model were similar to those obtained with a more straightforward and computationally less expensive spray drier model. Results from both models were similar to experimentally observed conditions. However, comprehensive validation was not possible. In order that full validation could be provided for a CFD model of a vortex combustion unit, a model was developed of a commercial thermal oxidiser used for the incineration of liquid and gaseous wastes. CFD temperature predictions for the BASF Thermal Oxidiser were validated by a series of experimental measurements obtained from the operating unit. In general, it was found that the Reynolds Stress Model for turbulence produced the most representative velocity flowfields, with the less computationally demanding k-e model being applicable only under certain limited circumstances. Furthermore, insufficient grid refinement resulted in significantly distorted velocity profiles.

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Kodajková, Zuzana. „Analýza tepelných ztrát pasivního manekýna ve větrané místnosti“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229197.

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This thesis is about problematics of creating Computational Fluid Dynamics (CFD) model suited for analysis of airflow around sitting passive person. Thesis includes analysis of velocity field distribution, thermal distribution and thermal losses in the surroundings of sitting thermal dummy (computational model) and comparison of these values with experimental measurements. Thesis is a part of large experimental research (this research is not included here) focused on creating of functional method used for person-surrounding airflow analysis in future commercial use.

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Yalcin, Fidan Seza. „Cfd Analysis Of A Notebook Computer Thermal Management Solution“. Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609483/index.pdf.

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In this study, the thermal management system of a notebook computer is investigated by using a commercial finite volume Computational Fluid Dynamics (CFD) software. After taking the computer apart, all dimensions are measured and all major components are modeled as accurately as possible. Heat dissipation values and necessary characteristics of the components are obtained from the manufacturer'
s specifications. The different heat dissipation paths that are utilized in the design are investigated. Two active fans and aluminum heat dissipation plates as well as the heat pipe system are modeled according to their specifications. The first and second order discretization schemes as well as two different mesh densities are investigated as modeling choices. Under different operating powers, adequacy of the existing thermal management system is observed. Average and maximum temperatures of the internal components are reported in the form of tables. Thermal resistance networks for five different operating conditions are obtained from the analysis of the CFD simulation results. Temperature distributions on the top surface of the chassis where the keyboard and touchpad are located are investigated considering the user comfort.

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黎浩然 und Ho-yin Albert Lai. „Artificial intelligence based thermal comfort control with CFD modelling“. Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B3122278X.

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Lai, Ho-yin Albert. „Artificial intelligence based thermal comfort control with CFD modelling /“. Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21929555.

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Babich, Francesco. „Thermal comfort in non-uniform environments : real-time coupled CFD and human thermal regulation modelling“. Thesis, Loughborough University, 2017. https://dspace.lboro.ac.uk/2134/32835.

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Energy consumption in buildings contributes more greenhouse gas emissions than either the industrial or transportation sectors, primarily due to space cooling and heating energy use, driven by the basic human need for thermal comfort and good indoor air quality. In recent years, there has been a proliferation of air conditioning in both residential and commercial buildings especially in the developing economic areas of the world, and, due to the warming climate and the growing disposable income in several densely populated developing countries, the energy demand for space cooling is dramatically increasing. Although several previous studies focused on thermal comfort, there are only a few works on asymmetrical environments or transient conditions, such as those expected when mixed mode ventilation or other low energy techniques such as elevated air movement generated by ceiling fans are adopted in the residential sector. Moreover, even fewer studies addressed the accuracy of computer predictions of human thermal comfort in non-uniform environmental conditions. However, focusing on non-uniform thermal environments is important because the space conditioning systems that generate them are often likely to be less energy consuming than those which provide more homogeneous conditions. This is due to the fact that these less energy-intensive space conditioning systems tend to condition the occupants, and not the entire room. The aim of this research was to investigate human thermal comfort in non-uniform transient environmental conditions, focusing in particular on the capability of predicting human thermal comfort in such conditions in residential buildings. Furthermore, this research investigated the energy savings that can be achieved in residential buildings when the same level of thermal comfort is delivered using less conventional, but lower-energy, approaches. In this research, a combination of computer based modelling, experimental work in controlled environments, and data from field studies was used. Computer modelling comprised CFD coupled with a model of human thermal physiology and human thermal comfort, and dynamic thermal modelling. In the experimental work, environmental chambers were used to collect data to validate the coupled CFD model. The data from field studies on real domestic buildings in India and in the UK was used to identify the most relevant configurations to be modelled using the coupled system. This research led to three main conclusions concerning thermal comfort in non-uniform environments: (i) the coupled model is able to predict human thermal comfort in complex non-uniform indoor configurations, as long as the environment around the human body is accurately modelled in CFD, and is superior to the traditional PMV model as both temporal and spatial variation and non-uniform conditions can be taken into account; (ii) dynamic thermal simulation completed using a dynamic cooling set-point showed that the energy demand for space cooling can be reduced by as much as 90% in mixed mode buildings by using ceiling fans, without jeopardising occupants' thermal comfort; and (iii) the accurate and validated transient three-dimensional CFD model of a typical Indian ceiling fan developed in this research can be used for any study that requires the air flow generated by a ceiling fan to be modelled in CFD.

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Al-Witry, Ali Qais. „Thermal performance of roll-bonded aluminium plate heat exchanger panels for use in ocean thermal energy conversion“. Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301658.

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Bücher zum Thema "Thermal CFT"

service), SpringerLink (Online, Hrsg. From Gravity to Thermal Gauge Theories: The AdS/CFT Correspondence: The AdS/CFT Correspondence. Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg, 2011.

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Papantonopoulos, Eleftherios, Hrsg. From Gravity to Thermal Gauge Theories: The AdS/CFT Correspondence. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-04864-7.

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Statens råd för byggnadsforskning (Sweden), Hrsg. CFC in refrigeration- and heat pump plants. Stockholm: Swedish Council for Buildings Research, 1989.

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Huang, Ming Jun. The application of computational fluid dynamics (CFD) to predict the thermal performance of phase change materials for the control of photovoltaic cell temperature in buildings. [S.l: University of Ulster, 2002.

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A, Hassan Y., Cho Chun H, American Society of Mechanical Engineers. Nuclear Engineering Division. und International Mechanical Engineering Congress and Exposition (1998 : Anaheim, Calif.), Hrsg. Proceedings of the ASME Nuclear Engineering Division, 1998: CFD and thermal hydraulic analysis in nuclear reactors : presented at the 1998 ASME International Mechanical Engineering Congress and Exposition, November 15-20, 1998, Anaheim, California. New York, N.Y: American Society of Mechanical Engineers, 1998.

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Papantonopoulos, Eleftherios. From Gravity to Thermal Gauge Theories: The AdS/CFT Correspondence. Springer, 2011.

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Serrano, Maria Isabel Roldán. Concentrating Solar Thermal Technologies: Analysis and Optimisation by CFD Modelling. Springer, 2016.

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Serrano, Maria Isabel Roldán. Concentrating Solar Thermal Technologies: Analysis and Optimisation by CFD Modelling. Springer, 2018.

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Serrano, Maria Isabel Roldán. Concentrating Solar Thermal Technologies: Analysis and Optimisation by CFD Modelling. Springer London, Limited, 2017.

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Christian, Jeffrey E. Impact of CFC restrictions on U.S. building foundation thermal performance. Oak Ridge National Laboratory., 1987.

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Buchteile zum Thema "Thermal CFT"

Soda, Jiro. „AdS/CFT on the Brane“. In From Gravity to Thermal Gauge Theories: The AdS/CFT Correspondence, 235–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-04864-7_8.

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Sachdev, Subir. „Condensed Matter and AdS/CFT“. In From Gravity to Thermal Gauge Theories: The AdS/CFT Correspondence, 273–311. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-04864-7_9.

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Argyres, Philip C. „Introduction to the AdS/CFT Correspondence“. In From Gravity to Thermal Gauge Theories: The AdS/CFT Correspondence, 57–75. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-04864-7_3.

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Janik, Romuald A. „The Dynamics of Quark-Gluon Plasma and AdS/CFT“. In From Gravity to Thermal Gauge Theories: The AdS/CFT Correspondence, 147–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-04864-7_5.

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Charmousis, Christos. „Introduction to Anti de Sitter Black Holes“. In From Gravity to Thermal Gauge Theories: The AdS/CFT Correspondence, 3–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-04864-7_1.

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Horowitz, Gary T. „Introduction to Holographic Superconductors“. In From Gravity to Thermal Gauge Theories: The AdS/CFT Correspondence, 313–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-04864-7_10.

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Kaminski, Matthias. „Flavor Superconductivity and Superfluidity“. In From Gravity to Thermal Gauge Theories: The AdS/CFT Correspondence, 349–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-04864-7_11.

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Petkou, Anastasios C. „Holographic Torsion and the Prelude to Kalb–Ramond Superconductivity“. In From Gravity to Thermal Gauge Theories: The AdS/CFT Correspondence, 395–422. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-04864-7_12.

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Siopsis, George. „Perturbations of Anti de Sitter Black Holes“. In From Gravity to Thermal Gauge Theories: The AdS/CFT Correspondence, 27–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-04864-7_2.

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Gursoy, U., E. Kiritsis, Liuba Mazzanti, G. Michalogiorgakis und Francesco Nitti. „Improved Holographic QCD“. In From Gravity to Thermal Gauge Theories: The AdS/CFT Correspondence, 79–146. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-04864-7_4.

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Konferenzberichte zum Thema "Thermal CFT"

Chakrabarti, Sidharth, I. Ghosh und Prasanta Kumar Das. „EVAPORATIVE COOLING IN A CLAY POT REFRIGERATOR:CFD SIMULATION AND EXPERIMENTAL VALIDATION“. In Second Thermal and Fluids Engineering Conference. Connecticut: Begellhouse, 2017. http://dx.doi.org/10.1615/tfec2017.cft.018375.

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Talebi, Elnaz, Manfred Korzen, Ana Espinós und Sascha Hothan. „The effect of damage location on the performance of seismically damaged concrete filled steel tube columns at fire“. In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.6984.

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In this paper, a nonlinear three-dimensional finite element (FE) model was developed and validated to study the effect of seismic damage location on the response of concrete filled tube (CFT) columns at fire after earthquakes. Three analyses were conducted consecutively in the modelling, namely, cyclic, thermal and structural. Results of the cyclic loading analysis comprising residual deformations were applied as the initial condition to the thermal-stress model, replicating the seismic performance of column. Following, a nonlinear sequentially coupled-thermal stress analysis was carried out to investigate the fire response of CFT columns after the seismic event. Three damage scenarios were contemplated, considering any possible potential damages that could be generated by the earthquake loading on CFT columns. The accuracy of proposed FE model was examined by comparing the numerical results with that of available tests on fire and cyclic loading. By means of validated model, the performance of damaged CFT columns was then investigated under fire after earthquakes. The level of damage was assumed as a high damage level, presuming that the column reached 50% of its lateral resistance while still maintaining its overall stability after the earthquake. The results were presented broadly, including the axial deformation history as well as the fire resistance time for CFT columns. To have a comprehensive insight on the influence of damage location in columns, the fire response of damaged specimens was compared with that of an intact one.

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Zhou, T., und Y. Song. „Design of ITER TF Magnet Cryostat Feeder Through“. In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29625.

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International Thermonuclear Experimental Reactor (ITER) TF feeder systems convey the cryogenic supply and electrical power to the TF coils. The Cryostat Feed-through (CFT) includes the straight feeder part from the cryostat wall to the S-Bend Box (SBB). It is the bottleneck of the feeders. The huge Lorentz-force is a challenge for the CFT design. So the reasonable distribution and structural design of the internal and external supports are important. The CFT include the cold (cryogenic) to warm (room temperature) transitions. It is highly integrated with the cryo-pipes, the busbars, the superconductor joints, the thermal radiation shield and the instrumentation pipes and so on. The cryogenic and electrical requirements, the vacuum and mechanical requirements, and so on are considered when the CFT is designed. This paper presents the functional requirements on the TF CFT, gives its structure. The supports are designed and arrayed according to their mechanical or thermal function separately to stand the huge mechanical loads and isolate the conducting heat load from room temperature respectively. The assembly scheme is also described. Mid-joint and cryostat joint are designed to give the facility for the assembly on location. The mechanical analysis result shows the stress in the stainless steel and G10 material both are within the materials stress safety margin. The heat load to the cryogenic pipes and busbars are also less than the requirement 15W. Transient thermal analysis of global feeder model indicates that 32 days are needed for the feeder components to cool down to the required condition.

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Sudhir, Pinjala Sai, und Debjyoti Banerjee. „Exploring Efficacy of Machine Learning (Artificial Neural Networks) for Enhancing Reliability and Resilience of Thermal Energy Storage Platforms Utilizing Phase Change Materials for Sustainability and Mitigating Food-Energy-Water (FEW) Nexus“. In ASME 2023 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/imece2023-117109.

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Abstract Thermal Energy Storage (TES) platforms can help balance the difference between energy consumption and supply. Phase change materials (PCMs) can enhance the performance of TES platforms by improving their resilience and reliability, as the high latent heat values of PCMs allow for more compact form factors. Inorganic PCMs have higher latent heat values than organic PCMs, but their reliability is often compromised due to their requirement for a high degree of supercooling for initiating nucleation for freezing. The “Cold Finger Technique (CFT)” can mitigate this issue by leaving a small portion of the PCM un-melted during the melt cycle, facilitating spontaneous nucleation during the freezing cycle. This study uses machine learning (ML) techniques to leverage the effectiveness of CFT by training an Artificial Neural Network (ANN) model to predict the time required to reach a designated melt-fraction of the PCM with outstanding accuracy. However, the fidelity of the dataset used to train the ANN algorithm can impact the accuracy of the predictions. The prediction errors were in the order ≤ 10% of the time required to reach the desired melt-fraction and are drastically bigger at 99% and 100% melt-fractions.

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Sai Sudhir, Pinjala, Gangchen Ren, Aditya Chuttar, Nandan Shettigar und Debjyoti Banerjee. „Deploying Machine Learning (ML) for Improving Reliability and Resiliency of Thermal Energy Storage (TES) Platforms by Leveraging Phase Change Materials (PCM) for Sustainability Applications and Mitigating Food-Energy-Water (FEW) Nexus“. In ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-97121.

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Abstract In this paper, machine learning (ML) techniques, more specifically artificial neural networks (ANN), are utilized to enhance the efficacy of Cold Finger Technique (CFT). Experiments were conducted by melting the PCM at different values of power input to an electrical heater (mounted at the base of the container and immersed in PCM). Temperature transients were recorded by three thermocouples that were mounted at locations corresponding to liquid-meniscus heights for melt fraction values of 30%, 60% and 85%. The surface temperature transients were measured using thermocouples mounted on the exterior of the container surface that were mounted at locations corresponding to liquid-meniscus heights for melt fraction values of 30%, 60% and 90%. The surface temperature transients afford a cheap, reliable and cost-effective option for predicting the required values in real-time (i.e., the time remaining to attain a desired melt fraction, say 85%, at any particular instant during the melting cycle). These results validated the approach reported by (Chuttar et al. 2022). The average prediction error in the last half hour (before reaching a target melt fraction of 85%) was less than 10 minutes for all but one of the datasets. The Mean Absolute Percentage Error (MAPE) was as low as 11% for some of the predicted values of the datasets.

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Alissa, H. A., K. Nemati, B. Sammakia, K. Ghose, M. Seymour und R. Schmidt. „Innovative approaches of experimentally guided CFD modeling for data centers“. In 2015 31st Thermal Measurement, Modeling & Management Symposium (SEMI-THERM). IEEE, 2015. http://dx.doi.org/10.1109/semi-therm.2015.7100157.

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Sathyanarayan, Suhas, Betsegaw Gebrehiwot, Vishnu Sreeram, Digvijay Sawant, Dereje Agonafer, Naveen Kannan, James Hoverson und Mike Kaler. „Steady state CFD modeling of an IT pod and its cooling system“. In 2015 31st Thermal Measurement, Modeling & Management Symposium (SEMI-THERM). IEEE, 2015. http://dx.doi.org/10.1109/semi-therm.2015.7100159.

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Alkharabsheh, Sami, Bahgat Sammakia, Saurabh Shrivastava und Roger Schmidt. „Implementing rack thermal capacity in a room level CFD model of a data center“. In 2014 30th Semiconductor Thermal Measurement & Management Symposium (SEMI-THERM). IEEE, 2014. http://dx.doi.org/10.1109/semi-therm.2014.6892237.

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Gebrehiwot, Betsegaw, Kushal Aurangabadkar, Naveen Kannan, Dereje Agonafer, Deepak Sivanandan und Mark Hendrix. „CFD analysis of free cooling of modular data centers“. In 2012 IEEE/CPMT 28th Semiconductor Thermal Measurement & Management Symposium (SEMI-THERM). IEEE, 2012. http://dx.doi.org/10.1109/stherm.2012.6188834.

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„Luncheon Speaker: Another day at the office: combining AI, CFD, and Belgian beer“. In 2020 36th Semiconductor Thermal Measurement, Modeling & Management Symposium (SEMI-THERM). IEEE, 2020. http://dx.doi.org/10.23919/semi-therm50369.2020.9142832.

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Berichte der Organisationen zum Thema "Thermal CFT"

Wang, Weimin, Satoshi Sasaki und Masaki Kakizawa. Thermal Analysis for a Radiator Using CFD. Warrendale, PA: SAE International, Mai 2005. http://dx.doi.org/10.4271/2005-08-0332.

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Rimpel, Aaron. PR-316-17200-R03 A Study of the Effects of Liquid Contamination on Seal Performance. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), Januar 2021. http://dx.doi.org/10.55274/r0012015.

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This project is a continuation of research to enhance dry gas seal (DGS) reliability. Previous work reviewed failures from literature and experience of manufacturers and end-users and identified that liquid contamination was the most common cause, but it was concluded there was insufficient quantitative data to base recommendations on for further DGS reliability enhancements. Therefore, experimental and analytical investigations were pursued to fill the void. The ultimate objective was to be able to predict DGS failures due to liquid contamination, which could lead to greater DGS reliability through improvements in design, instrumentation, and monitoring. From the previous project phase, testing had demonstrated that the introduction of small quantities of oil (liquid mass fraction up to 3%) produced a slight increase in torque but impacts on temperatures and leakage were negligible. Previous simulations demonstrated converged two-phase computational fluid dynamics (CFD) with conjugate heat transfer (CHT) solutions of the seal and reasonable trends, but the agreement with test data was lower than desired. The current project phase made significant improvements to the single- and two-phase CFD simulation of the DGS, lowering the discrepancy of all previously reported performance parameters. The current simulations were performed only at the 700 psi supply pressure case. Ideal gas was used, and CHT coupling was used to predict temperatures of the primary ring. The previous wall thermal boundary conditions were not well understood, so the current work focused on establishing performance with adiabatic walls.

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Griffith, B. T., D. Arasteh und S. Selkowitz. High-performance, non-CFC-based thermal insulation: Gas filled panels. Office of Scientific and Technical Information (OSTI), April 1992. http://dx.doi.org/10.2172/7145146.

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Smith, Thomas Michael, John N. Shadid, Roger P. Pawlowski, Eric C. Cyr und Timothy Michael Wildey. Thermal hydraulic simulations, error estimation and parameter sensitivity studies in Drekar::CFD. Office of Scientific and Technical Information (OSTI), Januar 2014. http://dx.doi.org/10.2172/1204072.

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Salko Jr, Robert, M. Pilch und Vineet Kumar. Code and Solution Verification Assessment of the CTF Thermal Hydraulic Subchannel Code. Office of Scientific and Technical Information (OSTI), September 2021. http://dx.doi.org/10.2172/1822036.

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Lee, S. THERMAL MODELING ANALYSIS OF CST MEDIA IN THE SMALL COLUMN ION EXCHANGE PROJECT. Office of Scientific and Technical Information (OSTI), November 2010. http://dx.doi.org/10.2172/1016381.

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Vegendla, Prasad, Adrian Tentner und Dezhi Dai. DEVELOPMENT AND VALIDATION OF A TWO-PHASE THERMAL-HYDRAULIC CFD CODE NEK-2P. Office of Scientific and Technical Information (OSTI), September 2020. http://dx.doi.org/10.2172/1670705.

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Johnson, C. J., und S. Long. Potential for thermal coal and Clean Coal Technology (CCT) in the Asia-Pacific. Office of Scientific and Technical Information (OSTI), November 1991. http://dx.doi.org/10.2172/5788935.

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Lee, S., und W. King. THREE-DIMENSIONAL THERMAL MODELING ANALYSIS OF CST MEDIA FOR THE SMALL ION EXCHANGE PROJECT. Office of Scientific and Technical Information (OSTI), September 2011. http://dx.doi.org/10.2172/1024400.

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