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Modèle de champ de phase pour l'étude de l'ébullition

Abstract : This study concerns both the modelling and the numerical simulation of boiling flows. First we propose a review concerning nucleate boiling at high wall heat flux and focus more particularly on the current understanding of the boiling crisis. From this analysis we deduce a motivation for the numerical simulation of bubble growth dynamics. The main and remaining part of this study is then devoted to the development and analyze of a phase field model for the liquid-vapour flows with phase change. We propose a thermodynamic quasi-compressible formulation whose properties match the one required fot the numerical study envizaged. The system of governing equations is a thermodynamically consistent regularization of the sharp interface model that is the advantage of the diffuse interface models. We show that the thickness of the interface transition layer can be defined independently from the thermodynamic description of the bulk phases, a property that is numerically attractive. We derive the kinetic relation that allows to analyze the consequences of the phase field formulation on the model of the dissipative mechanisms. Finally we study the numerical resolution of the model with the help of simulations of phase transition in simple configurations as well as of isothermal bubble dynamics.
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Submitted on : Thursday, July 29, 2010 - 11:02:45 AM
Last modification on : Thursday, September 24, 2020 - 4:00:22 PM
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  • HAL Id : pastel-00002308, version 1

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Pierre Ruyer. Modèle de champ de phase pour l'étude de l'ébullition. Sciences de l'ingénieur [physics]. Ecole Polytechnique X, 2006. Français. ⟨pastel-00002308⟩

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