Abstract
We have conducted laboratory experiments on spatio-temporal evolution of laminar plumes in a deformable gel beads layer. A thin experimental tank is filled with the mixture of deformable gei beads and a sugar syrup solution as the interstitial fluid. The buoyant plumes are generated by injection of a viscous fluid from a thin slit. When we injected a buoyant fluid, a gravitational instability like Rayleigh-Taylor instability occurs; Then the flow is localized and buoyant plumes are generated. The plume flow is relatively continuous at the source region, however, flow instability occurs along the plume axis and the pulsating flow is developed.
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