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Etude de la permittivite complexe d'ellipsoïdes disperses dans un milieu continu. Analyses theorique et numerique

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Resumé

Les lois de mélange classiques valables en général pour de très faibles fractions volumiques en matière dispersée sont étendues aux fortes concentrations par la méthode de Bruggeman. On indique les relations obtenues pour la distribution aléatoire d'ellipsoïdes au sein d'un milieu continu. Le cas des ellipsoïdes anisotropes est considéré ainsi que celui des systèmes multidispersés á plusieurs constituants.

En illustration on a étudié par analyse numérique le cas des ellipsoïdes isotropes de révolution dispersés dans un milieu isolant en mettant l'accent sur l'influence du rapporta/b des demi-axes.

Abstract

Blending laws derived for very small volume fractions of dispersed medium are extended to high concentrations, using Bruggeman method. Derivation is made in the case of a random distribution of ellipsoids dispersed in a continuous medium. The case of non isotropic ellipsoids and the case of multicomponent systems are also considered.

As an example, a numerical analysis is made in the case of isotropic ellipsoids of revolution dispersed in an insulating medium; particularly, the effect of the semi-axis ratioa/b is pointed out.

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Boned, C., Peyrelasse, J. Etude de la permittivite complexe d'ellipsoïdes disperses dans un milieu continu. Analyses theorique et numerique. Colloid & Polymer Sci 261, 600–612 (1983). https://doi.org/10.1007/BF01526626

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