Influence of obstacles on bubbles rising in water-saturated sand

Raphaël Poryles, Germán Varas, Valérie Vidal

Research output: Contribution to journalConference articlepeer-review


This work investigates the dynamics of air rising through a water-saturated sand confined in a Hele-Shaw cell in which a circular obstacle is trapped. The air is injected at constant flow rate through a single nozzle at the bottom center of the cell. Without obstacle, in a similar configuration, previous studies pointed out the existence of a fluidized zone generated by the central upward gas motion which entrains two granular convection rolls on its sides. Here, a circular obstacle which diameter is of the order of the central air channel width is trapped at the vertical of the injection nozzle. We analyze the influence of the obstacle location on the size of the fluidized zone and its impact on the morphology of the central air channel. Finally, we quantify the variations of the granular free surface. Two configurations with multiple obstacles are also considered.

Original languageEnglish
Article number09002
JournalEPJ Web of Conferences
StatePublished - 30 Jun 2017
Event8th International Conference on Micromechanics on Granular Media, Powders and Grains 2017 - Montpellier, France
Duration: 3 Jul 20177 Jul 2017


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