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Etude numérique de la dynamique des transferts couplés au sein d'un milieu poreux

Abstract : This thesis is a development of numerical methods for solving differential equations of balance sheets and optimization settings applied to problems of simultaneous transfers of mass and / or heat in a porous medium such as natural wood materiel. Based on the overview of numerical methods for solving differential equations, and partial differential equations for n parameters optimization, some of these methods are developed for two physical and chemical processes and examined for different practical experiments carried out in LERMAB laboratory. The first application focuses on the dynamics of isothermal transfer of water during the wood frying in the hygroscopic field. In this case the proposed modeling can show that for certain wood species, diffusionnels transfers of water in the gas phase and adsorbed phase are not necessarily realized under conditions where thermodynamic equilibrium between the two phases is provided. The second application focuses on modeling the slow pyrolysis of wood spices heated by conduction between two plates which temperatures varies between 150 ° C and 240 ° C. The curves giving the temperature in the heightened and the loss of mass are well represented by the proposed kinetic and transfer models. However, this application allows highlighting the limits of optimization methods in the presence of a large number of parameters to determine some of them are coupled.
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Submitted on : Thursday, March 29, 2018 - 11:35:29 AM
Last modification on : Thursday, April 12, 2018 - 1:59:58 AM
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  • HAL Id : tel-01748458, version 1


Bajil Ouartassi. Etude numérique de la dynamique des transferts couplés au sein d'un milieu poreux. Autre. Université Henri Poincaré - Nancy 1, 2009. Français. ⟨NNT : 2009NAN10039⟩. ⟨tel-01748458⟩



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