Capdevila Paramio, Roser
Total activity: 29
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Heat and Mass Transfer Technological Center (CTTC)
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rosercttc.upc.edu
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  • Numerical and experimental study of a flat plate collector with honeycomb transparent insulation and overheating protection system  Open access

     Kessentini, Hamdi
    Defense's date: 2014-02-14
    Universitat Politècnica de Catalunya
    Theses

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    En esta tesis se presenta un captador solar plano (FPC) con aislamiento transparente plástico (TIM ) y un sistema de protección al sobrecalentamiento de bajo coste. Este captador está destinado a suministrar calor en el rango de temperatura de 80 hasta 120°C. Un canal de ventilación es introducido por debajo del absorbedor con una compuerta térmicamente accionada mediante un sistema de resorte de tipo aleación con memoria. Este canal permite proteger el colector en condiciones de estancamiento, preservando al mismo tiempo un buen rendimiento durante el funcionamiento normal. Para este objetivo, un prototipo ha sido construido y probado experimentalmente. En paralelo, diferentes modelos numéricos se han implementado con el objetivo de predecir el comportamiento térmico de este captador. La presente tesis consta de seis capítulos detallados a continuación. En el primer capítulo, se ha realizado una revisión de la literatura con el fin de presentar el estado del arte más actual en el campo de calor solar a temperaturas medias. Esta revisión ha permitido apreciar los últimos hallazgos y desafíos clave relacionados con el tema estudiado y presentar la contribución de este trabajo al conjunto de conocimientos existentes. El segundo capítulo está dedicado a la descripción del dispositivo experimental: descripción técnica del captador, de los diferentes sensores utilizados y los procedimientos de prueba adoptadas. En el tercer capítulo, se ha implementado un modelo numérico de cálculo rápido. Este modelo está basado en la resolución de los diferentes componentes del captador por medio de una plataforma modular orientada a objetos. Pruebas experimentales de interior y exterior se han llevado a cabo y han demostrado la eficacia del sistema de sobrecalentamiento en condiciones de estancamiento. La comparación de los resultados numéricos con experimentos ha demostrado que el código puede reproducir con precisión el funcionamiento térmico del captador. Varias simulaciones paramétricas se han realizado con el fin de optimizar el diseño del captador: se han evalúado 3125 diferentes configuraciones por medio de prototipos virtuales. Los resultados han permitido proponer el diseño más prometedor del FPC con TIM de plástico capaz de trabajar a temperatura de funcionamiento de 100 °C con eficiencia prometedora. En el cuarto capítulo, los elementos más críticos del colector (canal de ventilación y cámara de aire&TIM) han sido sustituidos por objetos CFD en el código modular implementado. En las simulaciones CFD, se ha utilizado Large Eddy Simulation (LES) modelo. Las soluciones numéricas se han validado primero con casos de referencia y a continuación se han verificado los resultados del modelo general del captador por comparación con las pruebas experimentales que han mostrado buena concordancia. Este análisis preliminar ha permitido entender la transferencia de calor y dinámica de fluido a diferentes temperaturas de funcionamiento del colector estudiado.En el quinto capítulo, se ha llevado a cabo un análisis de la transferencia de calor por radiación y conducción en el aislamiento transparente de estructura alveolar. Este analisis ha sido llevada a cobo mediante de la resolución de la ecuación de energía en su forma tridimensional de forma acoplado a la ecuación de transferencia por radiación (RTE). Se ha utilizado el método de volúmenes finitos para la resolución de la RTE. Los resultados numéricos han sido comparados con resultados experimentales de varios TIM dados por diferentes autores en la literatura mostrando acuerdos aceptables. Un estudio paramétrico se ha llevado a cabo para investigar el efecto de la variación de los parámetros ópticos y dimensionales más relevantes del TIM en la transferencia de calor. Finalmente, el último capítulo resume la contribución de esta tesis y presenta las posibles direcciones de investigación futura.

    In this thesis a flat plate collector (FPC) with plastic transparent insulation materials (TIM) and a low-cost overheating protection system destined for heat supply from 80 to 120°C is presented. A ventilation channel with a thermally actuated door is inserted below the absorber allowing to protect the collector from stagnation conditions, while preserving good performance during normal operation. For this objective, a prototype has been constructed and experimentally tested and in parallel, numerical and CFD models have been implemented with the aim of predicting the thermal behavior of this collector. The present thesis consists of six chapters and a brief summary of each one is given below: In the first chapter, a literature survey is carried out in order to present the most updated R&D status in the field of solar heat at medium temperatures. This literature research has allowed to appreciate the latest findings and key challenges related to the studied topic and to present the contribution of this work to the pool of existing knowledge. The second chapter is devoted to the description of the experimental set up. The problem of overheating for FPC with TIM is first pointed out and the technical description of the studied FPC is then presented. The different sensors used and the test procedures adopted during the experiments are presented. In the third chapter, a fast calculation numerical model is implemented. This model is based on the resolution of the different components of the collector by means of a modular object-oriented platform. Indoor and outdoor tests are performed and have shown the effectiveness of the overheating system being able to maintain low enough temperatures at the collector preventing thus the plastic TIM from stagnation conditions. The comparison of the numerical results with experiments has demonstrated that the code can accurately reproduce the performance of the collector. Several parametric simulations are then performed in order to optimize the collector design: 3125 different configurations are evaluated by means of virtual prototyping and the results have allowed to propose the most promising design of a stagnation proof FPC with plastic TIM able to work at operating temperature 100°C with promising efficiency. In the forth chapter, the most critical elements of the collector (ventilation channel and air gap&TIM) have been substituted by high-level CFD objects in the implemented modular object-oriented code. For the detailed numerical simulations, Large Eddy Simulations (LES) modeling is used. In order to speed-up the simulations, parallelisation techniques are used. The numerical solutions are firstly validated with benchmark cases. Then, the general model of the collector is validated by comparison of the numerical results with the indoor experimental tests showing a reasonable agreement. The preliminary CFD simulation results have allowed to understand the heat transfer and fluid flow at different operating temperatures of the studied collector. In the fifth chapter, a heat transfer analysis of the honeycomb TIM is carried out. The combined radiation and conduction heat transfer across the isolated cell is treated by means of the solution of the energy equation in its three dimensional form which is coupled to the Radiative Transfer Equation (RTE). The Finite Volume Method is used for the resolution of the RTE. The numerical results are compared to experimental measurements of the heat transfer coefficient on various honeycomb TIM given by different authors in the literature showing acceptable agreements. Finally, a parametric study is conducted in order to investigate the effect of the variation of the most relevant optical and dimensional parameters of the TIM on the heat transfer. Finally, the last chapter summarizes the contribution of this thesis and discuss the possible directions of future research.

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    Heat transfer analysis and numerical simulation of a parabolic trough solar collector  Open access

     Amine Hachicha, Ahmed; Rodriguez Pérez, Ivette Maria; Capdevila Paramio, Roser; Oliva Llena, Asensio
    Applied energy
    Date of publication: 2013-11-01
    Journal article

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    Parabolic trough solar collector is the most proven industry-scale solar generation technology today available. The thermal performance of such devices is of major interest for optimising the solar field output and increase the efficiency of power plants. In this paper, a detailed numerical heat transfer model based on the finite volume method for these equipment is presented. In the model, the different elements of the receiver are discretised into several segments in both axial and azimuthal directions and energy balances are applied for each control volume. An optical model is also developed for calculating the non-uniform solar flux distribution around the receiver. This model is based on finite volume method and ray trace techniques and takes into account the finite size of the Sun. The solar heat flux is determined as a pre-processing task and coupled to the energy balance model as a boundary condition for the outer surface of the receiver. The set of algebraic equations are solved simultaneously using direct solvers. The model is thoroughly validated with results from the literature. First, the optical model is compared with known analytical solutions. After that, the performance of the overall model is tested against experimental measurements from Sandia National Laboratories and other un-irradiated receivers experiments. In all cases, results obtained shown a good agreement with experimental and analytical results.

    Parabolic trough solar collector is the most proven industry-scale solar generation technology today available. The thermal performance of such devices is of major interest for optimising the solar field output and increase the efficiency of power plants. In this paper, a detailed numerical heat transfer model based on the finite volume method for these equipment is presented. In the model, the different elements of the receiver are discretised into several segments in both axial and azimuthal directions and energy balances are applied for each control volume. An optical model is also developed for calculating the non-uniform solar flux distribution around the receiver. This model is based on finite volume method and ray trace techniques and takes into account the finite size of the Sun. The solar heat flux is determined as a pre-processing task and coupled to the energy balance model as a boundary condition for the outer surface of the receiver. The set of algebraic equations are solved simultaneously using direct solvers. The model is thoroughly validated with results from the literature. First, the optical model is compared with known analytical solutions. After that, the performance of the overall model is tested against experimental measurements from Sandia National Laboratories and other un-irradiated receivers experiments. In all cases, results obtained shown a good agreement with experimental and analytical results.

  • Acumulador de energía térmica en base a materiales de cambio de fase sólido-líquido y método de fabricación de la unidad

     Oliva Llena, Asensio; Perez Segarra, Carlos David; Rigola Serrano, Joaquim; Castro Gonzalez, Jesus; Oliet Casasayas, Carles; Rodriguez Pérez, Ivette Maria; Lehmkuhl Barba, Oriol; Trias Miquel, Francesc Xavier; Capdevila Paramio, Roser; Alba Queipo, Ramiro; Ordoño Martinez, Manuel Miguel; Morales Ruiz, Sergio
    Date of request: 2013-03-01
    Invention patent

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  • Máquina de absorción refrigerada por aire

     Oliva Llena, Asensio; Perez Segarra, Carlos David; Rigola Serrano, Joaquim; Castro Gonzalez, Jesus; Oliet Casasayas, Carles; Rodriguez Pérez, Ivette Maria; Lehmkuhl Barba, Oriol; Trias Miquel, Francesc Xavier; Capdevila Paramio, Roser; Alba Queipo, Ramiro; Ordoño Martinez, Manuel Miguel; Farnos Baulenas, Joan
    Date of request: 2013-06-14
    Invention patent

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  • Three dimensional numerical simulations of combined conduction and radiation in transparent insulation material

     Kessentini, Hamdi; Capdevila Paramio, Roser; Castro Gonzalez, Jesus; Oliva Llena, Asensio
    ISES Europe Solar Conference
    Presentation's date: 2012-09-19
    Presentation of work at congresses

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  • Study of turbulent natural convection in a tall differentially heated cavity filled with either non-participating, participating grey and participating semigrey media

     Capdevila Paramio, Roser; Lehmkuhl Barba, Oriol; Colomer Rey, Guillem; Perez Segarra, Carlos David
    European Thermal Sciences Conference
    Presentation's date: 2012
    Presentation of work at congresses

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    Turbulent natural couvection in a tall differentially heated cavity of aspect ratio 5:1, filled with air under a Rayleigh number based on the height of 4.5.10(10), is studied numerically. Three different situations have been analysed. In the first one, the cavity is filled with a transparent medium. In the second one, the cavity is filled with a semigrey participating mixture, of air mid water vapour. In the List (me the cavity contains a grey participating gas. The turbulent flow is described by means of Large Eddy Simulation (LES) using symmetry-preserving discretizations. Simulations are compared with experimental data available in the literature and with Direct Numerical Simulations (DNS). Surface and gas radiation have been simulated using the Discrete Ordinates Method (DOM). The influence of radiation on fluid flow behaviour has been analysed.

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    Numerical simulation of heat transfer and fluid flow in a flat plate solar collector with TIM and ventilation channel  Open access

     Kessentini, Hamdi; Lehmkuhl Barba, Oriol; Capdevila Paramio, Roser; Castro Gonzalez, Jesus; Oliva Llena, Asensio
    ISES Europe Solar Conference
    Presentation's date: 2012-09-20
    Presentation of work at congresses

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    Flat plate solar collector with plastic transparent insulation materials and ventilation channel as overheating protection system inserted between the absorber and the back insulation has been studied numerically. First, a general object-oriented unsteady model of this solar collector is developed and presented. It allows solving, in parallel way, every component separately and interacting with its neighbors to set the boundary conditions in every time step of the simulation. Every component can be simulated using its own mesh and the number of CPUs necessary (depending on the simulation level needed). Second, the numerical simulations of the fluid flow and heat transfer by natural convection in the bottom part (ventilation channel) and the upper part (air gap + TIM) of the collector are done separately. The simulation has taken into account the different operation modes of the channel (opened at high operation temperatures and closed in normal operations). A three dimensional parallel turbulent CFD model based on Large Eddy Simulation is used in the simulations. The obtained numerical results are validated with experimental and benchmark results found in the literature.

  • Sistema de almacenamiento de energía térmica combinando material sólido de calor sensible y material de cambio de fase

     Oliva Llena, Asensio; Perez Segarra, Carlos David; Rigola Serrano, Joaquim; Castro Gonzalez, Jesus; Oliet Casasayas, Carles; Rodriguez Pérez, Ivette Maria; Lehmkuhl Barba, Oriol; Trias Miquel, Francesc Xavier; Capdevila Paramio, Roser; Galione Klot, Pedro Andres
    Date of request: 2012-12-27
    Invention patent

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    Un sistema para el almacenamiento y recuperación de energía térmica empleando como medio al menos un material de cambio de fase (sólido-líquido) y un material sólido de calor sensible que se encargan de almacenar/recuperar el calor obtenido desde una fuente externa en forma de calor sensible y calor latente de cambio de fase. Dichos materiales están debidamente contenidos en un único tanque, en cuyo interior existen al menos dos zonas, cada una conteniendo un material diferente, y diferenciadas por el rango de temperaturas a las que son sometidas. La configuración más usada consiste en tres diferentes zonas configuradas al interior del tanque: zona caliente, en la parte superior del tanque, donde un material de cambio de fase encapsulado caracterizado por una temperatura de fusión alta está encerrado; zona fría, ubicada en la parte inferior, donde un material de cambio de fase con baja temperatura de fusión está colocado; y una zona media, que contiene un material sólido de calor sensible.

  • Numerical simulation of radiative heat transfer in turbulent flows

     Capdevila Paramio, Roser
    Defense's date: 2012-09-28
    Department of Heat Engines, Universitat Politècnica de Catalunya
    Theses

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    Numerical and experimental study of a flat plate solar collector with transparent insulation and overheating protection system  Open access

     Kessentini, Hamdi; Capdevila Paramio, Roser; Castro Gonzalez, Jesus; Oliva Llena, Asensio
    ISES Solar World Congress
    Presentation's date: 2011-08-28
    Presentation of work at congresses

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    In this paper a FPSC with TIM and an overheating protection system is investigated numerically and experimentally. The studied collector has been manufactured using a process similar to that of the conventional FPSC but by inserting a honeycomb TIM glued under the glass cover. The designed overheating protection system consists of a ventilation channel inserted between the absorber and the back insulation and has a thermally actuated door which opens when it reaches a specific temperature and remains closed otherwise. This system is designed to protect the collector when reaching stagnation conditions while preserving good performances during normal operations.

  • Numerical simulation of a parabolic trough solar collector considering the concentrated energy flux distribution

     Amine Hachicha, Ahmed; Rodriguez Pérez, Ivette Maria; Capdevila Paramio, Roser; Oliva Llena, Asensio
    ISES Solar World Congress
    Presentation's date: 2011-08-29
    Presentation of work at congresses

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  • Numerical simulations of turbulent natural convection coupled and uncoupled with radiation

     Capdevila Paramio, Roser; Lehmkuhl Barba, Oriol; Colomer Rey, Guillem; Trias Miquel, Francesc Xavier; Perez Segarra, Carlos David
    International Conference on Computational Heat and Mass Transfer
    Presentation's date: 2011-07-18
    Presentation of work at congresses

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    In the present work, turbulent natural convection in a tall differentially heated cavity of aspect ratio 5:1, filled with air (Pr = 0.7) under a Rayleigh number based on the height of 4.5 · 1010, is studied numerically. Two different situations have been analysed. In the first one, the cavity is filled with a transparent medium. In the second one, the cavity contains a grey participating gas. The turbulent flow is described by means of Large Eddy Simulation (LES) using symmetry-preserving discretizations. Simulations are compared with experimental data available in the literature and with Direct Numerical Simulations (DNS). Surface and gas radiation have been simulated using the Discrete Ordinates Method (DOM). The influence of radiation on fluid flow behaviour has also been analysed.

  • Turbulent natural convection in a differentially heated cavity of aspect ratio 5 filled with non-participating and participating grey media

     Capdevila Paramio, Roser; Lehmkuhl Barba, Oriol; Trias Miquel, Francesc Xavier; Perez Segarra, Carlos David; Colomer, G.
    European Turbulence Conference
    Presentation's date: 2011-12-22
    Presentation of work at congresses

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    In the present work, turbulent natural convection in a tall differentially heated cavity of aspect ratio 5:1, filled with air (Pr = 0.7) under a Rayleigh number based on the height of 4.5 centerdot 1010, is studied numerically. Two different situations have been analysed. In the first one, the cavity is filled with a transparent medium. In the second one, the cavity contains a grey participating gas. The turbulent flow is described by means of Large Eddy Simulation (LES) using symmetry-preserving discretizations. Simulations are compared with experimental data available in the literature and with Direct Numerical Simulations (DNS). Surface and gas radiation have been simulated using the Discrete Ordinates Method (DOM). The influence of radiation on fluid flow behaviour has also been analysed.

  • DESARROLLO CODIGOS Y ALGORITMOS PARALELOS ALTA PRESTACIONES FINES DISEÑO OPTIMIZADO SISTEMAS Y EQUIPOS TERMICOS

     Perez Segarra, Carlos David; Trias Miquel, Francesc Xavier; Capdevila Paramio, Roser; Chiva Segura, Jorge; Gorobets, Andrey; Giraldez Garcia, Hector; Ventosa Molina, Jordi; Oliva Llena, Asensio
    Participation in a competitive project

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  • Development and comparison of different spatial numerical schemes for the radiative transfer equation resolution using three-dimensional unstructured meshes

     Capdevila Paramio, Roser; Perez Segarra, Carlos David; Oliva Llena, Asensio
    Journal of quantitative spectroscopy and radiative transfer
    Date of publication: 2010-01
    Journal article

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  • Numerical simulation of turbulent natural convection and gas radiation in differentially heated cavities using FVM, DOM and LES

     Capdevila Paramio, Roser; Perez Segarra, Carlos David; Lehmkuhl Barba, Oriol; Colomer, Dolors
    European Conference on Computational Fluid Dynamics
    Presentation's date: 2010-06-15
    Presentation of work at congresses

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  • Numerical simulation of turbulent natural convention and gas radiation in diferentially heated cavities using FVM, DOM and LES

     Capdevila Paramio, Roser; Perez Segarra, Carlos David; Lehmkuhl Barba, Oriol; Colomer, G.
    International Symposium on Radiative Transfer
    Presentation's date: 2010-06-17
    Presentation of work at congresses

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  • CENTRE TECNOLOGIC TRANSFERENCIA CALOR

     Rigola Serrano, Joaquim; Capdevila Paramio, Roser; Jaramillo Ibarra, Julian Ernesto; Morales Ruiz, Sergio; Trias Miquel, Francesc Xavier; Castro Gonzalez, Jesus; Oliet Casasayas, Carles; Borrell Pol, Ricard; Rodriguez Pérez, Ivette Maria; Mohan Damle, Rashmin; Carmona Muñoz, Angel; Torras Ortiz, Santiago; Kizildag, Deniz; Ablanque Mejia, Nicolas; Lehmkuhl Barba, Oriol; Lopez Mas, Joan; Soria Guerrero, Manel; Gorobets, Andrey; Sadurni Caballol, Alexandre; Perez Segarra, Carlos David; Oliva Llena, Asensio
    Participation in a competitive project

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  • Development and comparison of different spatial numerical schemes for the radiative transfer equation resolution using three-dimensional unstructured meshes.

     Capdevila Paramio, Roser; Perez Segarra, Carlos David; Oliva Llena, Asensio
    EUROTHER Seminar
    Presentation's date: 2009-04-15
    Presentation of work at congresses

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    In the prescm work four different spatial numerical schemes have been developed with the aim of reducing the false-scattering of the numerical solutions obtained with DOM and FVM. These schcmes have been designed specifically for unstructured meshes by means of the projection of nodal values of intensity on the studied radiative direction. The schemes have been tested and compared in several 3D benchmark cases using both structured onhogonal and unstructured grids.

  • Coupling radiation and convection: Effect of radiation mesh on both results and performance

     Colomer Rey, Guillem; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Capdevila Paramio, Roser
    Fifth European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS)
    Presentation of work at congresses

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  • Development and comparison of different spatial numerical schemes for the radiative transfer equation resolution using three-dimensional unstructured meshes

     Capdevila Paramio, Roser; Perez Segarra, Carlos David; Oliva Llena, Asensio; COLOMER, G
    Fifth European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS)
    Presentation of work at congresses

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  • Informe 2

     Capdevila Paramio, Roser; Oliva Llena, Asensio
    Date: 2007-01
    Report

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  • Informe 3

     Capdevila Paramio, Roser; Oliva Llena, Asensio
    Date: 2007-02
    Report

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  • Informe 4

     Capdevila Paramio, Roser; Oliva Llena, Asensio
    Date: 2007-09
    Report

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  • Informe 5

     Capdevila Paramio, Roser; Oliva Llena, Asensio
    Date: 2007-09
    Report

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  • Informe 1

     Capdevila Paramio, Roser; Oliva Llena, Asensio
    Date: 2006-09
    Report

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  • Numerical Simulation of Turbulent Natural Convection and Gas Radiation in Differentially Heated Tall Cavities Using Discrete Ordinates Method

     Capdevila Paramio, Roser
    International Symposium on Turbulence, Heat and Mass Transfer
    Presentation's date: 2006-09-25
    Presentation of work at congresses

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  • Numerical Simulation of Turbulent Natural Convection and Gas Radiation in Differentially Heated Tall Cavities Using Discrete Ordinates Method

     Capdevila Paramio, Roser; Perez Segarra, Carlos David; COLOMER, G; Oliva Llena, Asensio
    International Symposium on Turbulence, Heat and Mass Transfer
    Presentation of work at congresses

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  • Numerical simulation of the thermal and fluid-dynamic behaviour of fuel-oil in sunk ships

     Perez Segarra, Carlos David; Consul Serracanta, Ricard; Capdevila Paramio, Roser; Oliva Llena, Asensio; Castro Gonzalez, Jesus; Mas de Les Valls Ortiz, Elisabet
    Symposium on Marine Accidental Oil Spills (VERTIMAR-2005)
    Presentation of work at congresses

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