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Article Dans Une Revue Journal of Fluid Mechanics Année : 2015

Liquid clustering and capillary pressure in granular media

Résumé

By means of extensive lattice Boltzmann simulations, we investigate the process of growth and coalescence of liquid clusters in a granular material as the amount of liquid increases. A homogeneous grain-liquid mixture is obtained by means of capillary condensation, thus providing meaningful statistics on the liquid distribution inside the granular material. The tensile stress carried by the grains as a function of the amount of condensed liquid reveals four distinct states, with a peak stress occurring at the transition from a primary coalescence process, where the cohesive strength is carried mostly by the grains, to a secondary process governed by the increase of the liquid cluster volumes. We show that the evolution of capillary states is correctly captured by a simple model accounting for the competing effects of the Laplace pressure and grain-liquid interface.
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Dates et versions

hal-01223545 , version 1 (11-01-2017)

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Jean-Yves Delenne, Vincent Richefeu, Farhang Radjai. Liquid clustering and capillary pressure in granular media. Journal of Fluid Mechanics, 2015, 762, 10 p. ⟨10.1017/jfm.2014.676⟩. ⟨hal-01223545⟩
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