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Pore network study of bubble growth by vaporisation in a porous medium heated laterally

Louriou, Clément and Prat, Marc Pore network study of bubble growth by vaporisation in a porous medium heated laterally. (2012) International Journal of Thermal Sciences, 52. 8-21. ISSN 1290-0729

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Official URL: http://dx.doi.org/10.1016/j.ijthermalsci.2011.09.008

Abstract

We present experimental and numerical investigations of vapour phase growth in a two-dimensional model porous medium heated laterally. Visualisation experiments reveal the existence of a heat pipe effect within the porous medium when a sufficiently high temperature gradient develops along the porous medium. The bubble growth is characterised by a pattern transition between an invasion percolation (IP) pattern in a first phase of the growth and an invasion percolation in a destabilising gradient (IPDG) at later times. It is shown that this transition corresponds at the pore scale to a transition between an invasion scenario where only one pore is invaded at each step of the invasion and a multiple pore invasion scenario. The IPDG pattern is characterised by the development of a thin vapour finger, which can explain premature vapour breakthroughs. This type of vapour finger cannot be simulated accurately using traditional models based on the continuum approach to porous media

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at International Journal of Thermal Sciences website : http://www.sciencedirect.com/science/journal/12900729
HAL Id:hal-00925602
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Marc PRAT
Deposited On:08 Jan 2014 10:56

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