SEQUENTIAL ABSORPTION OF MICRODROPS BY DOUBLE-LAYER POROUS MEDIA

The subject of this paper is the absorption of microdrops by multilayer porousmedia. The consideration is based on numerical simulation of sequentialabsorption of two droplets at its arbitrary location on the surface of single- anddouble-layer porous media. For description of fluid flow from a droplet into aporous material the Euler equations taking into account surface tension forceswere used together with the unsteady filtration equation. The layers of porousmedium were characterized by effective permeability coefficients dependent onporosity and pore size. The change in the droplet shape during absorption, thepropagation of absorbed fluid in a porous medium, the fields of velocities andpressure are the output data of the problem. The effect of porous mediumstructure parameters and relative location of droplets on the rate of absorptionand distribution of absorbed liquids is analyzed using the numerical experiment.It is shown that the presence of the second layer can significantly affect theduration and result of droplet absorption. The ratio of the pore size in the layersis found to be the main parameter that governs the effect of the second layer.