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Dissertations / Theses on the topic 'Bundle of tubes'

Author: Grafiati

Published: 7 July 2024

Last updated: 31 July 2025

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1

Mazzone, Robert Walter. "Enhanced condensation of R-113 on a small bundle of horizontal tubes." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/43769.

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Condensation of r-113 was studied using an evaporator condenser test platform. the condenser section contained four horizontal tubes (nominal outer diameter 15.9 mm)forming a vertical in line column with a pitch-to-diameter ratio of 2.25 and a condensing length of 1.2 m. the condenser tubes could be operated either individually (ie. as a single tube apparatus) or as a small tube bundle. this allowed investigation of the effects of condensate inundation on different types of condenser tubes. tubes tested were smooth copper tubes, copper/nickel korodense roped tubes, korodense tubes wrapped with

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2

Mabrey, Burlin Davis. "Condensation of refrigerants on small tube bundles." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/22984.

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Approved for public release; distribution is unlimited<br>The construction of an apparatus for the condensation performance testing of a horizontal bundle of four tubes with various refrigerants was completed. The apparatus was instrumented, and data reduction software was developed to provide bundle and single tube condensation data. Two tube bundles were tested, smooth copper tubes and low integral-fin copper-nickel tubes, with two refrigerants, R-114 and R-113. An enhancement ratio of about 2.0 for the overall heat transfer coefficient was demonstrated for the finned tubes over the smooth

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3

Beech, Philip Michael. "Filmwise condensation of high velocity downward flowing steam on a bundle of horizontal tubes." Thesis, Queen Mary, University of London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309675.

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4

Bazin, Clément. "Numerical and experimental studies of two-phase flows interacting with a bundle of tubes." Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAX106.

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Les générateurs de vapeur (GV) des centrales nucléaires sont composés de faisceaux de tubes soumis à des écoulements diphasiques eau-vapeur. Les vibrations liées à cette interaction peuvent induire des dommages (fatigue et usure par frottement et chocs) pouvant entraîner de graves conséquences pour la sûreté nucléaire.Dans le cadre de la prévention des risques vibratoires des tubes de GV des études expérimentales sont réalisées à l'aide de faisceaux analytiques de tubes droits soumis à un écoulement transverse diphasique.En parallèle, il est également important de développer un outil de simula

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5

Ramadan, Abdulghani. "Numerical And Experimental Investigation Of Forced Filmwise Condensation Over Bundle Of Tubes In The Presence Of Noncondensable Gases." Phd thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/3/12607831/index.pdf.

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The problem of the forced film condensation heat transfer of pure steam and steam-air mixture flowing downward a tier of horizontal cylinders is investigated numerically and experimentally. Liquid and vapor-air mixture boundary layers were solved by an implicit finite difference scheme. The effects of the free stream non-condensable gas (air) concentration, free stream velocity (Reynolds number), cylinder diameter, temperature difference and angle of inclination on the condensation heat transfer are analyzed. Inline and staggered tubes arrangements are considered. The mathematical model takes

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6

Marcel, Thibaud. "Simulation numérique et modélisation de la turbulence statistique et hybride dans un écoulement de faisceau de tubes à nombre de Reynolds élevé dans le contexte de l'interaction fluide-structure." Thesis, Toulouse, INPT, 2011. http://www.theses.fr/2011INPT0109/document.

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La prédiction des instabilités fluide-élastique qui se développent dans un faisceau de tubes est importante pour la conception des générateurs de vapeur dans les centrales nucléaires, afin de prévenir les accidents liés à ces instabilités. En effet, ces instabilités fluide-élastique, ou flottements, conduisent à une fatigue vibratoire des matériaux, voire à des chocs entre les tubes, et par la suite, à des dégâts importants. Ces aspects sont d'une grande complexité pour les applications scientifiques impliquant l'industrie nucléaire. Le présent travail est issu d'une collaboration entre l'EDF,

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7

Belghazi, Mourad. "Condensation d'un fluide pur et de mélanges zéotropes à l'extérieur d'un faisceau de tubes à surface améliorée." Université Joseph Fourier (Grenoble), 2001. http://www.theses.fr/2001GRE10055.

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8

Blanc, Philippe. "Condensation des fluides frigorigènes HFC134a et HFC22 à l'extérieur d'un faisceau de tubes horizontaux améliorés." Université Joseph Fourier (Grenoble ; 1971-2015), 1994. http://www.theses.fr/1994GRE10221.

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L'utilisation de nouveaux fluides frigorigenes respectueux de notre environnement remet en cause les connaissances etablies pour le dimensionnement des installations frigorifiques et de conditionnement d'air. Les condenseurs de type tema x, largement utilises dans de telles applications, sont composes d'un faisceau de tubes horizontaux ameliores a l'exterieur desquels vient se condenser la vapeur de fluide frigorigene. Le dimensionnement optimal d'un tel echangeur necessite la prise en compte de l'effet d'inondation du condensat le long des rangees de tubes du faisceau. L'approche experimental

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9

Mansur, Sergio Said. "Amélioration des échangeurs thermiques tubulaires par l'utilisation d'inserts hélicoïdaux à l'extérieur des tubes." Grenoble 1, 1993. http://www.theses.fr/1993GRE10192.

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Ce travail propose une etude numerique et experimentale du comportement thermohydraulique des echangeurs multitubulaires munis de bandes vrillees a l'exterieur des tubes. Des lois de frottement et d'echange thermique au sein de cette geometrie ont ete determinees experimentalement et programmees dans le logiciel trio developpe au commissariat a l'energie atomique, cea , avec une modelisation du type milieu poreux. Des mesures de pression et de vitesse, ainsi que des visualisations de l'ecoulement ont ete realisees sur un echangeur construit en plexiglas transparent. Les resultats obtenus dans

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10

Adom, Ebenezer. "Investigation of boiling heat transfer on small diameter tubes and tube bundles." Thesis, Heriot-Watt University, 2007. http://hdl.handle.net/10399/2067.

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Boiling heat transfer on the outside of small diameter tubes in the range of 1.8-3.0mm has been investigated. Pool boiling was investigated at nominal atmospheric pressure for each of the tubes iIi isolation. The experiment was varied by investigating the effect of bubbles from a second tube mounted below by varying the heat flux on the upper tube. The upper tube diameter was changed from 3.00 to 2.32 and 1.83mm and in each case the lower tube was 3.00mm. Experimental results showed that the upper tube heat transfer coefficient was enhanced due to the combined mechanism of translating bubbles

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11

Ortega, Del Rosario Maria de los Ángeles. "Système de stockage et transfert d'énergie par chaleur latente adaptable au rafraîchissement d’air en bâtiments : conception et analyse thermique." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0197/document.

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Ces travaux de thèse visent à concevoir et étudier une unité d'échangeur de chaleur air-MCP en tant que solution passive a la problématique du contrôle de confort thermique dans les bâtiments pendant l'été, fournissant des directives de conception et une intégration facile aux bâtiments. Les MCP présentent une grande capacité de stockage par unité de volume, ce qui leur permet de contribuer à la réduction de la consommation d'énergie liée aux applications de rafraîchissement. Bien qu'ils présentent certains inconvénients, en tant que faible conductivité thermique, notamment dans les PCM commer

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12

Havlů, Michal. "Algoritmus automatického výběru vhodného typu zařízení z databáze výměníků tepla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228730.

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Thesis is devoted to development of an database algorithm for selection (or necking selection) of suitable type of heat exchanger for given industrial application. Database creates a part of multipurpose calculation system containing three individual modules: (i) module for selection (or necking selection) of type of heat exchanger for given application, (ii) module for thermal-hydraulic design or rating of heat exchanger, (iii) module for calculation of investments and operating cost. Thesis describes details of method for selection of suitable heat exchanger type for given application and pr

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13

Gidi, Alejandro. "Two-phase flow-induced vibrations in a heated tube bundle." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0031/NQ66267.pdf.

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14

Ahmad, Hussain Hamed. "Boiling of immiscible systems over tube bundles." Thesis, Heriot-Watt University, 1989. http://hdl.handle.net/10399/966.

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15

Gorgy, Evraam. "Experimental evaluation of heat transfer impacts of tube pitch on highly enhanced surface tube bundle." Diss., Kansas State University, 2011. http://hdl.handle.net/2097/11995.

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Doctor of Philosophy<br>Department of Mechanical and Nuclear Engineering<br>Steven J. Eckels<br>The current research presents the experimental investigation of the effect of tube pitch on enhanced tube bundles’ performance. The typical application of this research is flooded refrigerant evaporators. Boosting evaporator’s performance through optimizing tube spacing reduces cost and energy consumption. R-134a with the enhanced tube Turbo BII-HP and R-123 with Turbo BII-LP were used in this study. Three tube pitches were tested P/D 1.167, P/D 1.33, and P/D 1.5. Each tube bundle includes 20 tubes

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16

McIlwain, Stuart Russell. "Improved prediction methods for finned tube bundle heat exchangers in crossflow." Thesis, University of Strathclyde, 2003. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21526.

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Previous methods for predicting the heat transfer and pressure drop performance of crossflow heat exchangers with finned tubes have concentrated on developing correlations. These correlations have been based on the researchers observations of what geometric parameters may affect the performance, and then dimensionless groups developed to allow a correlation to be developed. This work shows that many of these models are limited either by design or by their databases, and often are not general enough to cater for air-cooled heat exchangers as well as the generally larger scale heat recovery bund

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17

Nelson, Peter Jonathan. "Boiling the immiscible water/n - nonane system from a tube bundle." Thesis, Heriot-Watt University, 1986. http://hdl.handle.net/10399/1060.

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18

Omar, Hossin. "Numerical Simulations of Fluidelastic Instability in Tube Bundles." Thesis, University of New Brunswick, 2010. http://hdl.handle.net/1882/1089.

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Flow-Induced Vibration (FIV) is a major issue in designing shell and tube heat exchangers. Amongst FIV behaviour, fluidelastic instability (FEI) is the most damaging excitation mechanism since it can cause catastrophic failure of tube arrays. This study investigates unsteady flow in tube bundles and the fluid forces which can lead to large tube vibration amplitudes associated with FEI. The fluidelastic forces are approximated by the combining of the unsteady-flow model and a computation fluid dynamics (CFD) flow model. The unsteady flow through tube arrays is simulated using a two-dimensional

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19

Scoones, David John. "Boiling on plain and low-finned tube bundles." Thesis, Heriot-Watt University, 1986. http://hdl.handle.net/10399/2134.

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20

Andrews, Patrick Rowan. "Boiling on in-line and staggered tube bundles." Thesis, Heriot-Watt University, 1985. http://hdl.handle.net/10399/1608.

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21

Teixidó, Roman Miguel. "A cotangent bundle Hamiltonian tube theorem and its applications in reduction theory." Doctoral thesis, Universitat Politècnica de Catalunya, 2015. http://hdl.handle.net/10803/288376.

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The Marle-Guillemin-Sternberg (MGS) model is an extremely important tool for the theory of Hamiltonian actions on symplectic manifolds. It has been extensively used to prove many local results both in symplectic geometry and in symmetric Hamiltonian systems theory. It provides a model for a tubular neighborhood of a group orbit and puts in normal form the group action and the symplectic structure. The main drawback of the MGS model is that it is not explicit. Only it existence and main properties can be proved. Moreover, for cotangent bundles, this model does not respect the natural fibratio

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22

Chilman, Scott V. "Nucleate boiling characteristics of R-113 in a small enhanced tube bundle." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/28404.

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23

Castiglia, Davide. "Fluid flow and heat transfer in unconventional tube bundle arrangements in crossflow." Thesis, King's College London (University of London), 2002. https://kclpure.kcl.ac.uk/portal/en/theses/fluid-flow-and-heat-transfer-in-unconventional-tube-bundle-arrangements-in-crossflow(19f17b5f-6ea1-4f6c-9168-8e809d2495f7).html.

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24

Shire, Neil Frank. "Heat transfer and hydrodynamics of boiling over tube bundles." Thesis, Heriot-Watt University, 1995. http://hdl.handle.net/10399/769.

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25

Balabani, Stavroula. "An experimental investigation of the crossflow over tube bundles." Thesis, King's College London (University of London), 1996. https://kclpure.kcl.ac.uk/portal/en/theses/an-experimental-investigation-of-the-crossflow-over-tube-bundles(27c20ab8-798a-4a07-b1cd-b31fbd77578e).html.

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26

MacIver, Alasdair. "The application of enhanced surfaces to boiling over tube bundles." Thesis, Heriot-Watt University, 1993. http://hdl.handle.net/10399/1472.

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27

Penner, Lloyd Alan. "Two-dimensional flow predictions in a tube bundle using orthogonal and non-orthogonal grids." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/mq23452.pdf.

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28

Haas, Russell E. "Nucleate pool boiling of R-114/oil mixtures in a small enhanced tube bundle." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23733.

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29

Angula, Ester. "Numerical performance evaluation of a delugeable flat bare tube air-cooled steam condenser bundle." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/97151.

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Thesis (MEng)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT: In this study, one and two-dimensional models are developed for the evaluation of the thermal performance of a delugeable flat tube bundle to be incorporated in the second stage of an induced draft hybrid (dry/wet) dephlegmator (HDWD) of a direct air-cooled steam condenser (ACSC). Both models are presented by a set of differential equations. The one-dimensional model is analysed analytically by using three methods of analysis which are: Poppe, Merkel, and heat and mass transfer analogy. The two-dimensional model is analys

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30

Sadikin, Azmahani. "An experimental study of two-phase flow in idealised tube bundles." Thesis, Heriot-Watt University, 2013. http://hdl.handle.net/10399/2898.

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This thesis reports on an experimental study of air-water mixtures flowing through idealized shell and tube, in-line and staggered heat exchangers. The measured void fractions in the maximum and minimum gaps between the tubes are reported at near atmospheric conditions, to give local variations for different tube diameters and tube bundle arrangements. The void fraction measurements were made using a gamma-ray densitometer. The pressure drops in the tube bundles are also reported. These data are compared with the correlations available in the open literatures to investigate the void fraction a

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31

Li, Fang. "Heat Transfer in a High-pressure Gas-solid Fluidized Bed with Horizontal Tube Bundle and Continuous Addition of Fines." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/38002.

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Climate change is becoming more severe than ever in human history and the emission of green house gas urgently needs to be reduced while global energy consumption remains booming. Large-scale application of clean fossil fuel combustion shall be considered as a priority for its economical advantages as well as reliability in meeting global energy needs. Oxygen-fired pressurized fluidized bed combustor technology with downstream carbon capture and sequestration is considered a key approach to clean coal combustion. In such technology, the fluidized bed combustor operates at elevated pressures an

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32

Cui, Xingdong. "Prediction of critical heat flux in bundles using tube look-up table." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0002/MQ28415.pdf.

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33

Kanizawa, Fábio Toshio. "Estudo teórico e experimental sobre padrões de escoamento, fração de vazio e perda de pressão durante escoamento bifásico água-ar cruzado ascendente externo a banco de tubos." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/18/18147/tde-30032015-080832/.

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O presente trabalho envolve um estudo teórico e experimental do escoamento bifásico externo a banco de tubos. Inicialmente, apresenta-se uma ampla revisão da literatura sobre padrões de escoamento, fração de vazio e perda de pressão, durante escoamentos monofásicos e bifásicos externos a banco de tubos. Nesta análise são também descritos os métodos de previsão destes parâmetros. Verificam-se diferenças significativas entre as estimativas proporcionadas por eles, fato que indica a inexistência de métodos generalizados. Posteriormente é apresentada uma descrição detalhada da bancada experimental

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34

Schlup, Jason. "Two phase flow visualization in evaporator tube bundles using experimental and numerical techniques." Thesis, Kansas State University, 2013. http://hdl.handle.net/2097/16237.

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Master of Science<br>Department of Mechanical and Nuclear Engineering<br>Steven Eckels and Mohammad Hosni<br>This research presents results from experimental and numerical investigations of two-phase flow pattern analysis in a staggered tube bundle. Shell-side boiling tube bundles are used in a variety of industries from nuclear power plants to industrial evaporators. Fluid flow patterns in tube bundles affect pressure drop, boiling characteristics, and tube vibration. R-134a was the working fluid in both the experimental and computational fluid dynamics (CFD) analysis for this research.

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35

Liang, Chunlei. "Large eddy simulation of the turbulent flow and heat transfer in tube bundles." Thesis, King's College London (University of London), 2005. https://kclpure.kcl.ac.uk/portal/en/theses/large-eddy-simulation-of-the-turbulent-flow-and-heat-transfer-in-tube-bundles(73e0ff53-1135-4620-bb66-7eb3d091a7a6).html.

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36

Tuma, Juergen. "The enhancement of heat transfer to gases in longitudinal flow in tube bundles." Thesis, University of Brighton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280462.

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37

Almeshaal, Mohammed Abdulrahman. "An experimental and numerical study of two-phase flow in horizontal tube bundles." Thesis, Heriot-Watt University, 2013. http://hdl.handle.net/10399/2900.

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An effective design for a kettle reboiler is dependent on fitness for purpose while reducing costs. Thus, accurate information concerning two-phase flow behaviour within it is important. Experimental and numerical studies have been carried out in this research to gain a more detailed understanding of the phenomena associated with two-phase flow in a thin-slice kettle reboiler. The kettle reboiler contained 241 electrically heated tubes arranged as 17 rows of 17 columns in an in-line layout with an outside diameter of 19 mm and a pitch-to-diameter ratio of 1.34. The working fluids used in this

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38

Wu, Tzu-Yu. "Design of Confocal Microendscopy for Fallopian Tube Imaging and Detection of Esophageal Cancer." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/347227.

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This work presents several major developments related to a fluorescence confocal microendoscope technology that can provide instantaneous cellular level images from selected depths of tissue inside the human body. The confocal microendoscope systems discussed employ fiber-optic based imaging catheters coupled to custom built slit-scan confocal microscopes. One major new development involves the design, development, and testing of a new flexible confocal microgastroscope (CMG) system for imaging the esophagus. This new system has the potential to aid in the early detection of esophageal cancer.

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39

Bahaidarah, Haitham M. S. "A numerical study of heat and momentum transfer over a bank of flat tubes." Texas A&M University, 2004. http://hdl.handle.net/1969.1/2782.

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The present study considers steady laminar two-dimensional incompressible flow over both in-line and staggered flat tube bundles used in heat exchanger applications. The effects of various independent parameters, such as Reynolds number (Re), Prandtl number (Pr), length ratio (L/Da), and height ratio (H/Da), on the pressure drop and heat transfer were studied. A finite volume based FORTRAN code was developed to solve the governing equations. The scalar and velocity variables were stored at staggered grid locations. Scalar variables (pressure and temperature) and all thermophysical properties

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40

Ahlinder, Stefan. "On modelling of compact tube bundle heat exchangers as porous media for recuperated gas turbine engine applications." [S.l.] : [s.n.], 2006. http://se6.kobv.de:8000/btu/volltexte/2006/15.

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41

Ahlinder, Stefan [Verfasser]. "On Modelling of Compact Tube Bundle Heat Exchangers as Porous Media for Recuperated Gas Turbine Engine Applications / Stefan Ahlinder." Aachen : Shaker, 2006. http://d-nb.info/1170538037/34.

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42

Musa, Mohd Nor. "Condensation of a binary vapour of immiscible liquids on a horizontal tube bundle under the influence of vapour shear." Thesis, Heriot-Watt University, 1987. http://hdl.handle.net/10399/1046.

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43

Beccacece, Lorenzo. "Electromagnetic interaction between multi-walled carbon nanotube bundles." Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS268.

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L’utilisation des matériaux 1D et 2D dans les dispositifs électroniques suscite un intérêt dans la communauté scientifique et industriel. Grâce à leurs propriétés uniques, les chercheurs envisagent la miniaturisation de dispositifs électroniques fabriqués. Les nanotubes de carbone font partie des matériaux 1D. Après avoir fait l’état de l’art concernant le matériau et son intégration dans les dispositifs électroniques, on a pu déterminer de nouveaux axes de recherche. Ce travail de thèse porte sur la synthèse, caractérisation, modélisation et intégration des fagots verticaux de nanotubes de ca

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44

Akcasayar, Nezih. "Nucleate pool boiling performance of finned and high flux tube bundles in R-114/oil mixtures." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/27168.

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Approved for public release; distribLUion is unlimited<br>The heat transfer characteristics of pure R-114 and R-114/oil mixtures during nucleate pool boiling from a small bundle of finned and High Flux tubes were measured. The bundles had 5 instrumented and 10 additional heated tubes of 15.8 mm outside diameter which were arranged in an equilateral triangular pitch of 19.1 mm giving a pitch-to-diameter ratio of 1.2. Pure refrigerant with York-C lubrication oil mass con-centrations of 1, 2, 3, 6 and 10% was used. All experiments were performed at 2.2C corresponding to a pressure slightl

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45

Anderson, Carl Lee. "Nucleate pool boiling performance of smooth and finned tube bundles in R-113 and R-114/oil mixtures." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/27169.

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46

Eraydin, Hakan. "Nucleate pool boiling performance of small High Flux and Turbo-B tube bundles in R-114/oil mixtures." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA241936.

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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, December 1990.<br>Thesis Advisor(s): Marto, Paul J. ; Memory, Steve. "December 1990." Description based on title screen as viewed on March 30, 2010. DTIC Identifier(s): Pool Boiling. Author(s) subject terms: Heat Transfer, Pool Boiling. Includes bibliographical references (p. 102-104). Also available in print.

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47

Chýlek, Martin. "Tok látek v nestandardních procesních a energetických zařízeních." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-377756.

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Flow distribution has big importance in equipment with limited tube rows because it provides correct operation and sometimes specific flow distribution for technology purposes is needed. This thesis is focusing on flow analysis in these units using computational fluid dynamics (CFD). For analysis of such systems models with varying tube rows and varying perforated segment lengths were created. Analysis showed significant impact of flow manifold layout along with tube layout and number of tubes. Simplified 1D model using static pressure regain coefficient was created which provides much shorter

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48

Kubíček, Ondřej. "Návrh ohříváku topné vody pro vyvedení tepla z teplárny o výkonu 5,5 MW." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232145.

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The Master thesis deals with the water-heater design for heat-exchange station with total power output 5,5 MW. The goal of the thesis is to make thermal and hydraulic calculation in the extent of the assignment and to develop a projection drawing of the heater along with a correct dimensioning of the shell and flanges. Thesis goals were met according to the assignment. The introductory part of the thesis briefly introduces to the heat-exchanger problematic and selected topics about heat-transfer. Following the basic mass and energy flows calculation inside the heater together with the thermal

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Pomarède, Marie. "Investigation et application des méthodes d'ordre réduit pour les calculs d'écoulements dans les faisceaux tubulaires d'échangeurs de chaleur." Thesis, La Rochelle, 2012. http://www.theses.fr/2012LAROS355/document.

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Cette thèse s’intéresse à la faisabilité de la mise en place de modèles d’ordre réduit pour l’étude des vibrations sous écoulement au sein de faisceaux tubulaires d’échangeurs de chaleur. Ces problématiques sont cruciales car les systèmes étudiés sont des éléments majeurs des centrales nucléaires civiles et des chaufferies embarquées dans les sous-marins.Après avoir rappelé le fonctionnement et les risques vibratoires existants au sein des échangeurs de chaleur, des calculs complets d’écoulement et de vibrations sous écoulement ont été effectués, d’abord pour un tube seul en milieu infini, pui

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Volná, Kateřina. "Vliv zanášení svazku trubek v kotli na jeho životnost." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-377757.

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Fouling of tube bundles in boilers on the flue gas side affects not only the service life, but also the boiler heat output and increases maintenance and operating costs. Therefore, it is necessary to minimize or completely eliminate this process. This thesis focuses on comparison of the service life and the heat output of the tube bundles with and without deposit in the coal fired boiler. Simulations of flue gas flow in area of tube bundles with and without deposit are performed using ANSYS Fluent software, which shows that the surface of tube bundles with deposit is much less heated than the

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