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Using a micro particle imaging velocity technique, we resolve for the firsttime the three dimensionnal structure of wormlike shear banding flows instraight microchannels. The study revealed two effects, which should be genericfor shear banding flows: the first is a strong amplification of the confinementinduced by the edge of the channel, the second is an instability of theinterface between the shear bands. A detailed quantitative comparison of ourexperimental measurements with a theoretical study of the diffusive JohnsonSegalman model leads to excellent agreement. Our study clarifies the nature ofshear banding flow instabilities, and shows that, despite the challengingcomplexity of the situation and the uncertainty regarding their molecularstructure, shear banding flows in confined geometries are amenable toquantitative modelling, a feature that opens pathways to their practicalutilization.

Microchannel flow of a shear-banding fluid: enhanced confinement effect and interfacial instability