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Poster De Conférence Année : 2016

Liquid menisci equilibrium in a wet granular medium in pendular regime – Cohesive strength estimation for random smooth spheres packings

Edouard Canot
Renaud Delannay

Résumé

When a small amount of liquid water is present inside a granular medium (pendular regime), it is located between the grains, and these menisci form like bridges. The distribution of these menisci depends of many parameters as local temperature and pressure, geometrical configuration of the solid parts, and physicochemical aspects linked to surface tension and roughness of the grains, just to name a few. When humidity varies, for example during an evaporation or condensation process, the shape of the menisci changes a lot, because some liquid bridges may break, and this can strongly affect the mechanical behavior of the discrete medium. We consider in this paper a simple situation where the grains are perfect spheres and water is clean. A slight disorder is allowed for their position, leading to variable gaps between the spheres, some of them being in contact. An initial given mass of water is introduced in the cell, and is distributed at all the gaps. The localization is numerically determined by minimizing the surface energy and by using the Kelvin law, in an axisymmetric coordinates frame. Each liquid meniscus shape is computed either by using the classical toroidal model, or by solving a differential algebraic system of equations, stating that the total curvature is constant. Physical properties like surface tension and liquid/solid contact angle are input parameters. The mass of water is taken as the main control parameter, and we study the distribution of the menisci shape, especially the neck radius, because it is an important parameter for a global model taking into account the mechanical interactions. Another work, made in parallel to this one, consists in the numerical computation of the dynamic behavior due to heat and mass transfer of water across the domain.
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Dates et versions

hal-01398312 , version 1 (17-11-2016)

Identifiants

  • HAL Id : hal-01398312 , version 1

Citer

Edouard Canot, Renaud Delannay. Liquid menisci equilibrium in a wet granular medium in pendular regime – Cohesive strength estimation for random smooth spheres packings. Condensed Matter in Groningen (CMD26), Sep 2016, Groningue, Netherlands. . ⟨hal-01398312⟩
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