Velocity contrasts enhancement for shear thinning solutions flowing in a rough fracture

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dc.creatorAuradou, Harold
dc.creatorBoschan, Alejandro
dc.creatorChertcoff, Ricardo
dc.creatorGabbanelli, Susana
dc.creatorHulin, Jean-Pierre
dc.creatorIppolito, Irene
dc.date2007-03-03
dc.date.accessioned2026-07-07T07:50:16Z
dc.date.available2026-07-07T07:50:16Z
dc.descriptionFlow and transport are studied in transparent model fractures with rough complementary self-affine walls with a relative shear displacement $\vec{u}$. The aperture field is shown to display long range correlations perpendicular to $\vec{u}$: for flow in that direction, the width and geometry of the front of a dyed shear-thinning polymer solution displacing a transparent one have been studied as a function of the fluid rheology and flow rate. The front width increases linearly with distance indicating a convection of the fluids with a low transverse mixing between the flow paths. The width also increases with the flow-rate as the fluid rheology shifts from Newtonian at low shear rates $\dot γ$ towards a shear thinning behaviour at higher $\dot γ$ values. The width also increases with the polymer concentration at high flow-rates. These results demonstrate the enhancement of the flow velocity contrasts between different flow channels for shear thinning fluids. The relative widths at low and high $\dot γ$ values for different polymer concentrations are well predicted by an analytical model considering the fracture as a set of parallel ducts of constant hydraulic apertures. The overall geometry of the experimental front geometry is also predicted by the theoretical model from the aperture map.
dc.identifierhttps://arxiv.org/abs/physics/0703029
dc.identifierhttp://arxiv.org/abs/physics/0703029
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/125108
dc.subjectFluid Dynamics
dc.titleVelocity contrasts enhancement for shear thinning solutions flowing in a rough fracture
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