Abstract
The dynamics of melt migration in partially molten media has long been of interest in physical systems. In order to understand the spatio-temporal patterns of fluid transport in partially molten materials, we explored laboratory experiments on the behavior of viscous flow through deformable porous media. Our experiments were carried out in a transparent rectangular tank (2 × 20 × 18 cm) filled with deformable gel beads (poly acrylamide). A viscous fluid (sugar syrup-water mixture) was injected from a nozzle or a slit placed at the top of the tank. The viscosity and the flow rate of the injected fluid were varied (0.1-11 Pa.s; 0.05-0.33 ml/s). We identified three types of fluid flow in the experiments: (1) homogeneous permeable flow, (2) pulsating flow, and (3) localized continuous plume flow. The transition from the homogeneous permeable flow to the localized fluidized flow depends on injection flow rate, viscosity of the fluid, and deformation behaviors of the porous media. The second type of the flow has a characteristic period equivalent to the pulsation interval. This pulsating phenomenon within the gel mixture is excited by the fluid motion of the injected fluid and is controlled by a self-adjustable hydrodynamic valve composed of deformable gel beads.
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