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International Heat Transfer Conference 12

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

On the heat and mass tranfer with liquid-vapor phase change in capillary porous media. Application to capillary evaporators

B. Camassel
Institut de Mecanique des Fluides de Toulouse, U.M.R. C.N.R.S. - INP/UPS N°5502 Avenue du professeur Camille Soula, 31400 Toulouse, France

Marc Prat
Institut de Mecanique des Fluides de Toulouse, U.M.R. C.N.R.S. − INP/UPS N°5502, Avenue du professeur Camille Soula, 31400 Toulouse, France

Claude Butto
Laboratoire d'Etudes des Systemes et de l'Environnement Thermique de l'Homme, Universite Paul Sabatier, 118, route de Narbonne, 31062T oulouse Cedex, France

Marc Miscevic
Laboratoire Plasma et Conversion d'Energie (Laplace), UMR5213, Institut National Polytechnique-Universite Paul Sabatier-Centre National de la Recherche Scientifique (INP-UPS-CNRS), Toulouse, France

DOI: 10.1615/IHTC12.4740
6 pages

Abstract

Two aspects of transfers within the wick of a capillary evaporator are considered. First, we discuss experimental results obtained with a transparent two-dimensional porous medium. On the whole, the results are in agreement with previous pore-network numerical simulations. However, the experimental results also indicate the existence of thin films along the pore walls that explains why trapped liquid clusters can be observed even under steady-state conditions. This effect was neglected in the simulations. Then, we address the problem of the growth of the vapor zone induced by the imposed heat load at the boundary of the porous domain. We develop theoretical arguments and simulations consistent with the existence of a lower operating limit. The analysis suggests that the heat load should be sufficient for viscous effects to affect significantly the extension of the vapor zone in order to prevent possible depriming of the system due to a capillary fingering breakthrough.

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