Mixing-induced Reactive Plume in Random Sphere Packing

Description

Experimental dataset of Sanquer et al. Environmental Science and Technology (2024), https://doi.org/10.1021/acs.est.3c09749, obtained using high resolution laser induced fluorescence imaging and optical index matching. A steady mixing front is created by a co-flow injection of two miscible fluids that react to produce a fluorescent compound in a bead pack. The dataset includes: - 3D images of the bead pack - 3D images of a conservative tracer concentration field characterizing the mixing dynamics in the front - 3D images of a fluorescent component produced by the reactive mixing of the two fluids The experiment was performed by creating a steady coflow injection of two fluids forming a mixing front in the direction transverse to the main flow direction. The first fluid contained a reactive solution non-fluorescent (potassium ferricyanide), while the second fluid contained a reactive fluorescent-precursor (fluorescin) and a conservative (i.e. non reactive) fluorescent dye (rhodamine). The reaction between the two reactants produced a fluorescent compound (fluorescein). We used the different emission spectrum of the two fluorescent solutes to images them jointly using different laser and filter wavelengths. Once the steady flow was obtained, we scanned the column from inlet (bottom) to outlet (top) for both wavelength in order to image both the conservative concentration field and the reaction product concentration field. Prior to the experiment, we also scanned the empty column (no tracers) to generate mask images. Parameters of the column: - bead mean diameter : 7 mm - bead diameter range : 6-8 mm - measured porosity (using mask images) : 0.33 Parameters of the image stacks: - stack dimension (pixels) : 2000x2000x100 - stack dimension (cm) : 3.1x3.1x22 - 16 bits unsigned - concentration conversion (reaction product) : 30 500 = 1 µM of fluorescein - concentration conversion (conservative) : 35 000 = 1 µM of rhodamine The data has been acquired at Géosciences Rennes, UMR6118 CNRS University of Rennes. Data set authors: Hugo Sanquer, Joris Heyman, Khalil Hanna, Tanguy Le Borgne Main Related Publication : "Microscale chaotic mixing as a driver for chemical reactions in porous media", Environmental Science and Technology, https://doi.org/10.1021/acs.est.3c09749 Contact : tanguy.le-borgne@univ-rennes.fr