[Modeling sorption hysteresis in hygroscopic materials] : Modélisation des hystérésis de sorption dans les matériaux hygroscopiques

Seddik Merakeb (1) , Frédéric Dubois (1) , Christophe Petit (1)

1 GEMH - Groupe d'Etudes des Matériaux Hétérogènes

This article deals with a sorption/desorption model in a hygroscopic material which is derived of the thermodynamic study of the phase equilibrium between the free water and its saturated vapor pressure. This model presents the hysteresis and cyclic variation aspects of the environment relative humidity. The sorption isotherm traduces the explanation of the equilibrium between the bound water phase in the material and the vapor pressure in the environment. This model allows expressing partial variation in the relative humidity domain under variable temperature. A good fitting is obtained with experimental results.

Mots clés: Transferts thermiques; Équilibre hygroscopique; Isotherme de sorption; Teneur en eau; Heat transfer; Hygroscopic equilibrium; Sorption isotherm; Hysteresis; Moisture content

Domaines: Chimie; Matériaux; Sciences de l'ingénieur [physics]; Matériaux

Seddik Merakeb, Frédéric Dubois, Christophe Petit. [Modeling sorption hysteresis in hygroscopic materials] : Modélisation des hystérésis de sorption dans les matériaux hygroscopiques. Comptes Rendus Mécanique, 2009, 337 (1), pp.34-39. ⟨10.1016/j.crme.2009.01.001⟩. ⟨hal-00639252⟩