Milli-PIV rheology of shear-thinning fluids

Maxime Chinaud (1, 2) , Thomas Delaunay (2, 3) , Sébastien Cazin (1) , Emmanuel Cid (1) , Philippe Tordjeman (1)

1 IMFT - Institut de mécanique des fluides de Toulouse
2 IES - Institut d’Electronique et des Systèmes
3 M2A - Matériaux, MicroCapteurs et Acoustique

Milli-Particle Image Velocimetry (Milli-PIV), which is an application of the standard PIV has been developed to measure the velocity distribution of complex fluids in a millimetric Hele-Shaw cell. A laser sheet is sent perpendicularly to the cell and the camera observes the PIV images via an internal optical prism. We studied, with Milli-PIV, a structural series of shear thinning xanthan fluids at different injection rates. We determined the velocity profiles in the thickness of the flow cell and discussed the accuracy of measurement. Using an inverse method, we calculated the constitutive parameters and showed that they are similar to those measured by rheology. The pressure gradient characteristic of the couple experimental conditions - fluid were also calculated from modeling the velocity profile.

Mots clés: Milli-PIV; Shear thinning fluids; Hele-Shaw cell; Velocity profile

Domaines: Mécanique des fluides [physics.class-ph]; Mécanique des fluides [physics.class-ph]

Maxime Chinaud, Thomas Delaunay, Sébastien Cazin, Emmanuel Cid, Philippe Tordjeman. Milli-PIV rheology of shear-thinning fluids. Journal of Non-Newtonian Fluid Mechanics, 2012, vol. 169-170, pp. 114-120. ⟨10.1016/j.jnnfm.2011.12.003⟩. ⟨hal-00904778⟩