https://doi.org/10.1051/epjconf/202124909002
Solute transport by suspended buoyant particles
Grupo de Medios Porosos, Facultad de Ingeniería, Universidad de Buenos Aires, CONICET, Paseo Colón 850, (C1063ACV) Buenos Aires, Argentina.
* Corresponding author: abosch@fi.uba.ar
Published online: 7 June 2021
The transport of a colouring solute, driven by the buoyant displacement of microscopic suspended particles, and in the absence of net flow, is studied experimentally in a Hele Shaw cell. Initially, a sharp interface between a transparent fluid without particles and an underlying coloured suspension is obtained. From this situation, the suspended particles rise, carrying the solute in the form of a fingering instability across the interface, where a light transmission technique is used to measure the local solute concentration. This one attains an asymptotic value that increases with the solid fraction ϕ of suspended particles, and decreases with the distance to the interface. The solute mass discharge also increases with ϕ, always being relatively small (< 3%). The onset and development of the instability as the mechanism driving the transport of the solute is discussed.
A video is available at https://doi.org/10.48448/en5x-9j84
© The Authors, published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
