A method is proposed for assessing the effect of the size and shape of alumina powder particles on the average radius of the capillaries of the porous structure of alumina ceramics by the geometric coefficient of the shape of particles and their specific surface area. The technique is based on a three-dimensional model of the porous structure of materials, taking into account the geometry of the capillaries. The resulting expression for the mean radius of capillaries is much more accurate than the Kozeny formula and methods based on the model with non-intersecting capillaries, which give underestimated values ??of the radius. It is noted that the effect of the thickness of porous ceramic samples on the gas permeability coefficient is insignificant.
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