|Title||Liquid clustering and capillary pressure in granular media|
|Publication Type||Journal Article|
|Year of Publication||2015|
|Authors||Delenne J-Y, Richefeu V, Radjai F|
|Journal||Journal of Fluid Mechanics|
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.
|Short Title||J. Fluid Mech.|