Tesis doctoral de Barbara Vidal Jimenez
In this thesis a detailed numerical simulation of liquid-solid phase change phenomena has been made, because this phenomenology is of great interest in different industrial areas. the simulation done implies problems of nonlinearity, strong couplings and movable interphase. Like a result, only for the simplest configurations analytical tools can be used, whereas to solve the most of interest problems numerical methods are needed. These methods consist in the discretisation of the equations that define the phenomenology in small cells or control volumes. In this study the finite volume method (fvm) has been used for the governing equations discretisation using cartesian meshes. A displaced mesh is used; this means that the components of the speed vector are calculated in the faces of the control volumes, which allows a correct coupling between the continuity and momentum equations. so the code as the numerical solutions have been properly verified. The code verification consist of verifying that this is free of programming errors and that the behaviour of the numerical schemes is agreed with the theoretical one. For the verification of the numerical solution the richardson extrapolation method or a mesh refinement study have been used. Once the code and the numerical solutions have been properly verified, the final validation of the process simulation is obtained comparing the numerical results with experimental ones. the gallium melting problem in a square cavity heated by a side has been widely used by investigators with the objective of evaluating the numerical methods used for solving the phase change phenomena. Although this material have the advantages of its thermophysical properties are well established, the phase change temperature is near the room temperature and is a material with a great industrial interest, also presents some disadvantages like having an anisotropic thermal conductivity of the solid phase. However, the great number of experimental
Datos académicos de la tesis doctoral «Modelizacion del cambio de fase solido-liquido. aplicacion en sistemas de acumulacion de energia termica.«
- Título de la tesis: Modelizacion del cambio de fase solido-liquido. aplicacion en sistemas de acumulacion de energia termica.
- Autor: Barbara Vidal Jimenez
- Universidad: Politécnica de catalunya
- Fecha de lectura de la tesis: 09/07/2007
Dirección y tribunal
- Director de la tesis
- Assensi Oliva Llena
- Tribunal
- Presidente del tribunal: José manuel Pinazo ojer
- pere Colomer vilanova (vocal)
- Antonio Pascau benito (vocal)
- José Fernández seara (vocal)