2006/09/06 by Alexandro Boschan, Alejandro Boschan, Harold Auradou +6
Engineering · Environmental Science · Physics and Astronomy · #Enhanced Oil Recovery Techniques #Groundwater flow and contamination studies #Hydraulic Fracturing and Reservoir Analysis #physics.flu-dyn
paper · pdf · doi:10.1029/2006wr005324
published as Water Resources Research, 43, W03438 (2007)
arxiv created 2006/09/06 · openalex publication_date 2007/03/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The miscible displacement of a shear‐thinning fluid by another fluid with the same rheological properties is studied experimentally in a transparent fracture by an optical technique that images relative concentration distributions. The fracture walls have complementary self‐affine geometries and are shifted laterally in the direction perpendicular to the mean flow velocity U : The flow field is strongly channelized and macrodispersion controls the front structure for Péclet numbers above a few units. The global front width increases therefore linearly with time and reflects the velocity distribution between the different channels. In contrast, at the local scale, front spreading is similar to Taylor dispersion between plane‐parallel surfaces. Both dispersion mechanisms depend strongly on the fluid rheology, which shifts from Newtonian to shear thinning when the flow rate increases. In the latter domain, increasing the concentration enhances the global front width but reduces both Taylor dispersion (due to the flattening of the velocity profile in the gap of the fracture) and the size of medium scale front structures.