Now showing items 27-46 of 75

    Manteniment integral de motors d'encesa per compressió de cogeneració mitjançant l'anàlisi del lubricant. Validació experimental de nous paràmetres de control 

    González Castro, Josep Ramon (Date of defense: 2001-07-25)

    En les últimes dècades s'han impulsat nombroses investigacions adreçades a optimitzar el disseny, la fabricació i l'explotació de centrals de cogeneració i, en particular, les que són accionades per motors alternatius ...

    Modelización del cambio de fase sólido-líquido. Aplicación en sistemas de acumulación de energía térmica 

    Vidal Jiménez, Bárbara (Date of defense: 2007-07-09)

    En este trabajo se ha realizado una simulación numérica detallada del fenómeno de cambio de fase sólido-líquido, por ser esta fenomenología de gran interés en diferentes áreas industriales. <br/>La simulación realizada ...

    Modelling and experimental validation of water vapor absorption by falling films of LiBr aqueous solution under wave regimes conditions and presence of non-absorbable gases 

    García Rivera, Eduardo (Date of defense: 2015-04-17)

    Esta tesis se centra en el estudio de los diferentes mecanismos implicados en la absorción de vapor de agua en películas descendentes de configuración vertical (tipica configuracion para absorbedores enfriados por aire) ...

    Modelling and numerical simulation of combustion and multi-phase flows using finite volume methods on unstructured meshes 

    Muela Castro, Jordi (Date of defense: 2018-04-11)

    The present thesis is devoted to the development and implementation of mathematical models and numerical methods in order to carry out computational simulations of complex heat and mass transfer phenomena. Several areas ...

    Multiphysics simulation in buildings 

    Souaihi, Oussama (Date of defense: 2017-12-22)

    Numerical simulation play an important role in the design, engineering, operation and management of buildings. It can help reducing energy consumption, improving indoor air quality and thermal comfort and provide quantitative ...

    A new grey area mitigation technique for DES : theory and assessment 

    Pont Vilchez, Arnau (Date of defense: 2020-12-17)

    The use of hybrid RANS-LES methods has become widespread during the last decade, as an interesting approach for covering the gap between RANS and LES turbulence models in terms of both computational resources and degree ...

    Numerical algorithms for three dimensional computational fluid dynamic problems 

    Mora Acosta, Josue (Date of defense: 2001-12-20)

    The target of this work is to contribute to the enhancement of numerical methods for the simulation of complex thermal systems. Frequently, the factor that limits the accuracy of the simulations is the computing power: ...

    Numerical analysis and experimental studies of vapour compression refrigerating systems: special emphasis on different cycle configurations 

    Sadurní Caballol, Alexandre (Date of defense: 2012-09-28)

    The aim of this work is to study the thermal behavior and fluid-dynamic systems, vapor compression refrigeration and its components (heat exchangers, expansion devices, compressors, connecting pipes, pumps and pressure ...

    Numerical and experimental study of a flat plate collector with honeycomb transparent insulation and overheating protection system 

    Kessentini, Hamdi (Date of defense: 2014-02-14)

    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 ...

    Numerical investigation of particle-fluid interaction system based on discrete element method 

    Zhang, Hao (Date of defense: 2014-11-28)

    This thesis focuses on the numerical investigation of the particle-fluid systems based on the Discrete Element Method (DEM). The whole thesis consists of three parts, in each part we have coupled the DEM with different ...

    Numerical methods for radiative heat transfer 

    Colomer Rey, Guillem (Date of defense: 2006-06-26)

    L'objectiu principal d'aquesta tesi es l'estudi de la transferència d'energia per radiació. Per aquest motiu, s'ha estudiat la fenomenologia bàsica de la transferencia de calor per radiació. Tenint en compte el tipus ...

    Numerical modeling of complex heat transfer phenomena in cooling applications 

    Hou, Xiaofei (Date of defense: 2015-06-26)

    Multiphase and multicomponent flows are frequently encountered in the cooling applications due to combined heat transfer and phase change phenomena. Two-fluid and homogeneous mixture models are chosen to numerically study ...

    Numerical modelling of a parabolic trough solar collector 

    Hachicha, Ahmed Amine (Date of defense: 2013-09-30)

    Concentrated Solar Power (CSP) technologies are gaining increasing interest in electricity generation due to the good potential for scaling up renewable energy at the utility level. Parabolic trough solar collector (PTC) ...

    Numerical resolution of turbulent flows on complex geometries. 

    Lehmkuhl Barba, Oriol (Date of defense: 2012-07-26)

    This thesis aims at developing a numerical methodology suitable for the direct numerical simulation (DNS) and large-eddy simulation (LES) of turbulent flows in order to be used in complex flows, currently encountered in ...

    Numerical simulation and experimental validation of hermetic reciprocating compressors. Integration in vapour compression refrigerating systems 

    Rigola Serrano, Joaquim (Date of defense: 2002-09-27)

    The numerical simulation model presented is based on the integration of the fluid conservation equations (continuity, momentum and energy) in the whole compressor domain (compression chamber, valves, manifolds, mufflers, ...

    Numerical simulation and experimental validation of vapor compression refrigerating systems: special emphasis on natural refrigerants 

    Ablanque Mejía, Nicolás (Date of defense: 2010-07-21)

    The aim of this work is to study the thermal and fluid-dynamic behavior of vapor compression refrigerating systems and their constitutive elements (heat exchangers, expansion devices, compressors and connecting tubes) ...

    Numerical simulation of flames using flamelet models 

    Ahmad, Shamshad (Date of defense: 2017-04-06)

    The thesis topic is located in the domain of numerical simulation of laminar flames. The principal aim of the presented research is the study of numerical techniques for the multidimensional simulation of flames with low ...

    Numerical simulation of bubbles and drops in complex geometries by using dynamic meshes 

    Gutiérrez Álvarez, Enrique (Date of defense: 2018-07-17)

    CFD techniques are important tools for the study of multiphase flows, because most of the physical phenomena of these flows often happen on space and time scales where experimental methodologies are impossible in practice. ...

    Numerical simulation of frost growth and densification using deformable and static grids 

    Bartrons Casademont, Eduard (Date of defense: 2018-10-05)

    The present thesis aims at developing a basis for the numerical simulation of the growth and densification of macroscopic frost sheets. Notwithstanding the fact that icing has still a long way to fully understand its ...

    Numerical simulation of multiphase flows : level-set techniques 

    Balcázar Arciniega, Néstor Vinicio (Date of defense: 2014-09-30)

    This thesis aims at developing numerical methods based on level-set techniques suitable for the direct numerical simulation (DNS) of free surface and interfacial flows, in order to be used on basic research and industrial ...