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Faculté des Sciences appliquées
Faculté des Sciences appliquées
MASTER THESIS
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Implementation of a melting/solidification process with the enthalpy method

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Lopez Sahuquillo, Jaime ULiège
Promotor(s) : Terrapon, Vincent ULiège
Date of defense : 21-Aug-2017 • Permalink : http://hdl.handle.net/2268.2/3274
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Title : Implementation of a melting/solidification process with the enthalpy method
Author : Lopez Sahuquillo, Jaime ULiège
Date of defense  : 21-Aug-2017
Advisor(s) : Terrapon, Vincent ULiège
Committee's member(s) : Dewallef, Pierre ULiège
Salvador, Lucas ULiège
Language : English
Number of pages : 123
Keywords : [en] Enthalpy-porosity technique
[en] OpenFOAM solver
[en] Finite Volume Method
[en] PCMs
[en] Marangoni Convection
[en] Melting of Gallium
Discipline(s) : Engineering, computing & technology > Aerospace & aeronautics engineering
Research unit : Centre Spatial de Liège
Target public : Researchers
Professionals of domain
Student
Institution(s) : Université de Liège, Liège, Belgique
Centre Spatial de Liège, Liège, Belgique
Degree: Master en ingénieur civil en aérospatiale, à finalité spécialisée en "aerospace engineering"
Faculty: Master thesis of the Faculté des Sciences appliquées

Abstract

[en] Phase change materials (PCMs) are of high interest in thermal storage and thermal management applications for the earth and for space environments. Nevertheless, their functionality is intrinsically attached to phase change processes, which, from experience, it is known that they are computationally challenging. The present project arises with the intention to give a numerical solution to this problematic.

A solver based on the enthalpy-porosity technique, capable to deal with diffusive-convective phase change has been adapted for OpenFOAM 4.1. For the implementation of the enthalpy technique, the work of Voller Mushy has been closely followed, and a detailed explanation of the equations employed and the assumptions that support them is given. Furthermore, the numerical approach is also specified, with a close attention to the discretization process based on the Finite Volume Method (FVM). The solver algorithm is provided with a deep explanation of its implementation in OpenFOAM. Furthermore, an analysis of the convergence of the numerical solution is provided.

Moreover, the works of several authors, have been employed to help in some aspects of the implementation and validation of the solver. As part of this validation, the controversial case of the melting of pure Gallium in a rectangular cavity is computed with the OpenFOAM solver. The author gives some discussion about the results obtained and compares them with the existing literature in order to assess the accuracy of the mathematical model employed.

The last part of the project employs the customize solver to analyze the thermal behaviour of a PCM during melting. Three different cases are proposed and tested for two different geometries: one under gravity conditions, where natural convection is part of the heat transfer process, and another two independent of gravity or proper of micro-gravity environments: a pure conductive case and a case with Bénard-Marangoni convection.


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Author

  • Lopez Sahuquillo, Jaime ULiège Université de Liège > Master ingé. civ. aérospat., à fin.

Promotor(s)

Committee's member(s)

  • Dewallef, Pierre ULiège Université de Liège - ULg > Département d'aérospatiale et mécanique > Systèmes de conversion d'énergie pour un dévelop.durable
    ORBi View his publications on ORBi
  • Salvador, Lucas ULiège Université de Liège - ULg > CSL (Centre Spatial de Liège)
    ORBi View his publications on ORBi
  • Total number of views 345
  • Total number of downloads 5735










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