Article,

Effect of the relative location of the droplets and the structure of a porous medium on the rate of absorption and distribution of a liquid

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Journal of Engineering Thermophysics, 17 (1): 60--70 (Mar 1, 2008)
DOI: 10.1007/s11823-008-1006-0

Abstract

Abstract  The present work focuses on numerical simulation of the sequential absorption of two droplets at an arbitrary location on the surface of single-and double-layer porous media. For description of fluid flow from a droplet into a porous medium, the Euler equations taking into account surface tension forces were used together with the unsteady filtration equations. The layers of porous media were characterized by effective permeability coefficients dependent on the porosity and pore size. The change in the droplet shape during absorption, the propagation of the absorbed fluid in a porous medium, and the fields of velocities and pressure are the output data of the problem. The effect of the porous medium structure parameters and relative location of droplets on the rate of absorption and distribution of absorbed liquids is analyzed using a numerical experiment. It is shown that the presence of the second layer can significantly affect the duration and result of the droplet absorption. The ratio of the pore size in the layers is found to be the main parameter that governs the effect of the second layer.

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