Analyse expérimentale des mécanismes d'instabilité lors de l'ébullition d'un milieu poreux chauffé à température constante

Abstract : The aim of this work is to study some experimental and theoretical aspects of unsteady mechanisms of boiling in porous media. We are interested in the case of boiling in a porous layer of glass beads saturated with water. A new experimental device has been built up with the following boundaries conditions: at the bottom impervious and imposed temperature ; at the top permeable and imposed temperature. Various experiments are presented for different sizes of beads. For beads of diameter 40-70 and 100-160 microns, a stable state is obtained with the superposition of a vapor film, a two-phase zone at the boiling temperature and a liquid zone at the top. For beads of diameter 200-250 microns, a unsteady periodic state with a movement of large amplitude of the front between the two-phase region and the liquid zone is observed. Last, for beads of diameter 800-1200 microns, whereas turbulent natural convection is present in the upper liquid zone, a return to the front stability is observed. The influence of a gravitational instability, of the natural convection and of the front movement is investigated using linear stability analyses.
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Theses
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http://docnum.univ-lorraine.fr/prive/INPL_T_2000_DOMINIAK_P.pdf
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https://hal.univ-lorraine.fr/tel-01750408
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Submitted on : Thursday, March 29, 2018 - 12:45:28 PM
Last modification on : Friday, March 30, 2018 - 1:28:14 AM

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Pascal Dominiak. Analyse expérimentale des mécanismes d'instabilité lors de l'ébullition d'un milieu poreux chauffé à température constante. Autre [cond-mat.other]. Institut National Polytechnique de Lorraine, 2000. Français. ⟨NNT : 2000INPL056N⟩. ⟨tel-01750408⟩

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