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Dissertations / Theses on the topic 'CFD modelling for gas coolers'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 February 2022

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1

Santosa, I. Dewe. "Optimisation gas coolers for CO2 refrigeration application." Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/12161.

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Carbon dioxide (CO2) is a natural, low cost refrigerant with good thermo-physical properties. CO2 is a good alternative for replacing HFC refrigerants that possess high global warming potential and reducing the direct impacts of refrigeration systems on the environment. However, CO2 refrigeration systems operate at relatively high condenser/gas cooler pressures and this imposes special design and control considerations. The gas cooler is a very important part of the system and can have significant influence on its performance. In sub-critical operation, good gas cooler/condenser design can red

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2

Van, Antwerpen Hermanus Johannes. "Modelling a pebble bed high temperature gas-cooled reactor using a system-CFD approach / Hermanus Johannes (Herman) van Antwerpen." Thesis, North-West University, 2007. http://hdl.handle.net/10394/1301.

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The objective of this study was the development of a systems-CFD model of the PBMR reactor that used the minimum number of grid points to achieve grid independence. The number of grid points is reduced by increasing the accuracy of the discretisation scheme in the reactor model. Any reduction in the number of grid points leads to an increase in calculation speed, which is critical for systems simulation codes that are used for optimisation or transient simulations. While some previous reactor models had been developed for systems simulation codes, their discretisation schemes have not been opt

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3

Keshmiri, Amir. "Thermal-hydraulic analysis of gas-cooled reactor core flows." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/thermalhydraulic-analysis-of-gascooled-reactor-core-flows(29335acf-a397-4b8c-8217-fd2ee0d26967).html.

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In this thesis a numerical study has been undertaken to investigate turbulent flow and heat transfer in a number of flow problems, representing the gas-cooled reactor core flows. The first part of the research consisted of a meticulous assessment of various advanced RANS models of fluid turbulence against experimental and numerical data for buoyancy-modified mixed convection flows, such flows being representative of low-flow-rate flows in the cores of nuclear reactors, both presently-operating Advanced Gas-cooled Reactors (AGRs) and proposed ‘Generation IV’ designs. For this part of the projec

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4

Uyanwaththa, Asela R. "CFD modelling of gas turbine combustion processes." Thesis, Loughborough University, 2018. https://dspace.lboro.ac.uk/2134/34686.

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Stationary gas turbines manufacturers and operators are under constant scrutiny to both reduce environmentally harmful emissions and obtain efficient combustion. Numerical simulations have become an integral part of the development and optimisation of gas turbine combustors. In this thesis work, the gas turbine combustion process is analysed in two parts, a study on air-fuel mixing and turbulent combustion. For computational fluid dynamic analysis work the open-source CFD code OpenFOAM and STAR-CCM+ are used. A fuel jet injected to cross-flowing air flow is simplified air-fuel mixing arrangeme

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5

Palipana, Aruna Susantha. "CFD modelling of natural gas combustion in spark ignited engines." Thesis, Loughborough University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327653.

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6

Walker, David Howey. "CFD Modelling of Sewage Sludge Vitrification Plant." Thesis, University of Canterbury. Chemical and Process Engineering, 2008. http://hdl.handle.net/10092/1717.

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This Technology in Industry Fellowship (TIF) funded Masters Project was structured around Computational Fluid Dynamics (CFD) modelling for Lemar Environmental Ltd (Lemar). This study is a component of a larger programme that is being undertaken by Lemar concerning the vitrification process. The modelling has built on an initial model developed by CSIRO for Lemar and has been carried out under the direction of Canterbury University. The modelling involved computer simulations and detailed comparisons of the gas flow for both high and low swirl vanes, in both the steady state and transient modes

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7

Johnson, S. Rejish Lal. "Thermal gas radiation modelling for CFD simulation of rocket thrust chamber." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264357.

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Methane and oxygen are a promising propellant combination in future rocket propulsion engines mainly due to its advantages like reusability and cost reduction. In order to have a comprehensive understanding of this propellant combination extensive research work is being done. Especially, for reusable rocket engines the thermal calculations become vital as an effective and efficient cooling system is crucial for extending the engine life. The design of cooling channels may significantly be influenced by radiation. Within the framework of this thesis, the gas radiation heat transfer is modelled

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8

Samee, Lal Rejish Lal Johnson. "Thermal gas radiation modelling for CFD simulation of rocket thrust chamber." Thesis, KTH, Kraft- och värmeteknologi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-261230.

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Methane and oxygen are a promising propellant combination in future rocket propulsion engines mainly due to its advantages like reusability and cost reduction. In order to have a comprehensive understanding of this propellant combination extensive research work is being done. Especially, for reusable rocket engines the thermal calculations become vital as an effective and efficient cooling system is crucial for extending the engine life. The design of cooling channels may significantly be influenced by radiation. Within the framework of this thesis, the gas radiation heat transfer is modelled

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9

Armstrong, Lindsay-Marie. "CFD modelling of the gas-solid flow dynamics and thermal conversion processes in fluidised beds." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/192155/.

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10

Tian, Zhaofeng, and rmit tian@gmail com. "Numerical Modelling of Turbulent Gas-Particle Flow and Its Applications." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080528.150211.

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The aim of this thesis is three-fold: i) to investigate the performance of both the Eulerian-Lagrangian model and the Eulerian-Eulerian model to simulate the turbulent gas-particle flow; ii) to investigate the indoor airflows and contaminant particle flows using the Eulerian-Lagrangian model; iii) to develop and validate particle-wall collision models and a wall roughness model for the Eulerian-Lagrangian model and to utilize these models to investigate the effects of wall roughness on the particle flows. Firstly, the Eulerian-Lagrangian model in the software package FLUENT (FLUENT Inc.)

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11

Owoyemi, Olumuyiwa. "CFD modelling of mono-component and binary gas-solid fluidized beds with application to industrial materials." Thesis, University College London (University of London), 2007. http://discovery.ucl.ac.uk/1446457/.

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Fluidized bed technology is employed in a wide range of industrial applications, covering the pharmaceutical, food, chemical and petrochemical industries as well as the mining and power generation industries. However in most industrial applications of fluidization, the suspension consists of non-spherical particles of different diameters and sometimes-different densities. Computational Fluid Dynamics modelling has been recognized by several in academia and industry as an indepensible tool to study multiphase systems including fluidization. CFD models that describe gas solid flow systems can be

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12

Correia, Sara Alexandra Chanoca. "Development of improved mathematical models for the design and control of gas-fired furnaces." Thesis, University of South Wales, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369080.

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13

Ramasetti, E. K. (Eshwar Kumar). "Modelling of open-eye formation and mixing phenomena in a gas-stirred ladle for different operating parameters." Doctoral thesis, Oulun yliopisto, 2019. http://urn.fi/urn:isbn:9789526223568.

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Abstract In ladle metallurgy, gas stirring and the behaviour of the slag layer are very important for alloying and the homogenization of the steel. When gas is injected through a nozzle located at the bottom of the ladle into the metal bath, the gas jet exiting the nozzle breaks up into gas bubbles. The rising bubbles break the slag layer and create an open-eye. The size of the open-eye is very important as the efficiency of the metal-slag reactions depend on the interaction between the slag and steel created during the stirring process, and information about the position and size of the open-

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14

Impoco, Stefano. "Probabilistic analysis of the performance of barriers controlling the ignition of combustible gas in gas turbine air intakes." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Nowadays, the frequent occurrence of hydrocarbon leaks underlies the need for investigating every possible contribution to the fire and explosion risk in the oil and gas industry. Hence, controlling the potential ignition sources is paramount for ensuring tolerable risk levels. Among potential ignitors, gas turbines (GT) are regarded as one of the main contributors when employed for mechanical-drive in the process area of offshore facilities even though their behaviour when acting as live sources has never been analysed in detail. This study aimed at investigating both the role that GTs play o

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15

Arimboor, Chinnan Jacob. "Simulation and validation of in-cylinder combustion for a heavy-duty Otto gas engine using 3D-CFD technique." Thesis, KTH, Förbränningsmotorteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-245172.

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Utsläpp från bilar har spelat stor roll de senaste decennierna. Detta har lett till ökad användning av Otto gasmotorer som använder naturgas som bränsle. Nya motordesigner behöver optimeras för att förbättra motorens effektivitet. Ett effektivt sätt att göra detta på är genom användningen av simuleringar för att minska ledtiden i motorutvecklingen. Verifiering och validering av simuleringarna spelar stor roll för att bygga förtroende för och förutsägbarhet hos simuleringsresultaten. Syftet med detta examensarbete är att föreslå förbränningsmodellparametrarna efter utvärdering av olika kombinat

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16

Collins, William Tristan. "Development and validation of a combustion model for a fuel cell off-gas burner." Thesis, University of Cambridge, 2008. https://www.repository.cam.ac.uk/handle/1810/225369.

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A low-emissions power generator comprising a solid oxide fuel cell coupled to a gas turbine has been developed by Rolls-Royce Fuel Cell Systems. As part of the cycle, a fraction of the unreacted fuel (the off-gas) and oxidizer streams is reacted in a burner, which is the main source of pollutant formation. In this thesis a computational model of the burner has been developed which captures the formation of NOx and the oxidation of CO. This model gives accurate predictions at low computational cost, making it suitable for use as a design tool in future burner design optimization through paramet

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17

Nanson, III Richard A. "Navier/Stokes/Direct Simulation Monte Carlo Modeling of Small Cold Gas Thruster Nozzle and Plume Flows." Digital WPI, 2002. https://digitalcommons.wpi.edu/etd-theses/254.

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This study involves the modeling of small cold-gas (N2) thrusters nozzle and plume flows, their interactions with spacecraft surfaces and the induced pressure environment. These small cold-gas thrusters were used for pitch, yaw and roll control and were mounted on the bottom of the conical Environmental Monitor Payload (EMP) suborbital spacecraft. The pitch and yaw thrusters had 0.906 mm throat diameter and 4.826 mm exit diameter, while the roll thrusters had 1.6 mm throat diameter and 5.882 mm exit diameter. During thruster firing, at altitudes between 670 km and 1200 km, pressure measurem

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18

Antonelli, Anna Giulia. "An experimental study of water BLEVE." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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A BLEVE is a physical explosion characterized by the sudden expansion of a liquefied gas under pressure and the vapor space above it. In this work, the analysis of a set of water BLEVE experiments was carried out both in terms of data processing and numerical modelling. The main purpose of the project was to investigate safety implications of a pipe rupture containing superheated water that may affect a steam generation system in a nuclear or chemical plant. The experimental campaign consisted in 27 explosive tests in which an instantaneous depressurization of the content was enabled by the us

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19

Chen, Fang. "Modélisation d'un jet de gaz dans le collecteur sodium des échangeurs à plaques compacts sodium gaz des réacteurs nucléaires de la filière RNR-Na." Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0380.

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Cette thèse s’inscrit dans le projet d’ASTRID au CEA Cadarache. L’objectif de cette thèse est de développer un outil numérique capable de décrire finement la structure du jet de gaz sous-détendu dans du sodium en fonction du débit de la fuite de gaz. Dans un jet de gaz dans un liquide, il existe une couche de gouttelettes issues du liquide et une couche des bulles de gaz. Le modèle de Baer-Nunziato est alors choisi car c’est le modèle le plus adapté pour cette étude. De plus, la diffusion visqueuse, l’échange de quantité de mouvement entre les deux phases sont également pris en compte. Le modè

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20

Belmar, Gil Mario. "Computational study on the non-reacting flow in Lean Direct Injection gas turbine combustors through Eulerian-Lagrangian Large-Eddy Simulations." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/159882.

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[ES] El principal desafío en los motores turbina de gas empleados en aviación reside en aumentar la eficiencia del ciclo termodinámico manteniendo las emisiones contaminantes por debajo de las rigurosas restricciones. Ésto ha conllevado la necesidad de diseñar nuevas estrategias de inyección/combustión que operan en puntos de operación peligrosos por su cercanía al límite inferior de apagado de llama. En este contexto, el concepto Lean Direct Injection (LDI) ha emergido como una tecnología prometedora a la hora de reducir los óxidos de nitrógeno (NOx) emitidos por las plantas propulsoras de lo

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21

Van, Antwerpen Herman. "Modelling a pebble bed high temperature gas-cooled reactor using a system-CFD approach / Hermanus Johannes van Antwerpen." Thesis, 2007. http://hdl.handle.net/10394/1301.

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22

Dapelo, Davide, F. Alberini, and John Bridgeman. "Euler-Lagrange CFD modelling of unconfined gas mixing in anaerobic digestion." 2015. http://hdl.handle.net/10454/16983.

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Yes<br>A novel Euler-Lagrangian (EL) computational uid dynamics (CFD) nite volume-based model to simulate the gas mixing of sludge for anaerobic digestion is developed and described. Fluid motion is driven by momentum transfer from bubbles to liquid. Model validation is undertaken by assessing the ow eld in a labscale model with particle image velocimetry (PIV). Conclusions are drawn about the upscaling and applicability of the model to full-scale problems, and recommendations are given for optimum application.

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23

Lane, Graeme Leslie. "Computational modelling of gas-liquid flow in stirred tanks." 2006. http://hdl.handle.net/1959.13/25727.

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Research Doctorate - Doctor of Philosophy (PhD)<br>This thesis describes a study in which the aim was to develop an improved method for computational fluid dynamics (CFD) modelling of gas-liquid flow in mechanically-stirred tanks. Stirred tanks are commonly used in the process industries for carrying out a wide range of mixing operations and chemical reactions, yet considerable uncertainties remain in design and scale-up procedures. Computational modelling is of interest since it may assist in investigating the detailed flow characteristics of stirred tanks. However, as shown by a review of th

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