Guillaume Dumazer (UiO) presented at Powders & Grains 2017.
Download paper: “Self-Structuring of Granular material under Capillary Bulldozing“. Guillaume Dumazer, Bjørnar Sandnes, Monem Ayaz, Knut Jørgen Måløy and Eirik Flekkøy. EPJ Web Conf. Vol. 140, 2017.
The paper “Frictional Fluid Dynamics and Plug Formation in Multiphase Millifluidic Flow” (Dumazer_PRL028002) was picked as PRL “Editors’ Suggestion”, and was “Featured in Physics”:
Synopsis: Forming Granular Plugs
See also: News and FYFD
A repeating pattern of granular plugs emerges when a tube filled with water and grains is slowly drained. The moving air-water meniscus bulldozes the grains ahead, and friction eventually causes the grains to jam, forcing the air to penetrate through the accumulated material. Once through to the other side, the air starts to pile up another plug, and the process repeats until the whole tube is clogged full of granular plugs separated by empty gaps.
Dumazer et al., Frictional Fluid Dynamics and Plug Formation in Multiphase Millifluidic Flow. Phys. Rev. Lett. 117, 028002 – Published 7 July 2016. Dumazer_PRL028002
This movie shows what happens when you inject a gas into a granular suspension at different injection rates. At low rates, “stick slip” bubbles emerge, followed by “temporal intermittency” where periods of continuous motion are interrupted by occasional jamming. Increasing the injection rate further produces a spectacular “coral”-like pattern, and ultimately destabilized viscous fingers appear at high rates.