Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2009-09-07
Physics
Condensed Matter
Soft Condensed Matter
Scientific paper
Using a micro particle imaging velocity technique, we resolve for the first time the three dimensionnal structure of wormlike shear banding flows in straight microchannels. The study revealed two effects, which should be generic for shear banding flows: the first is a strong amplification of the confinement induced by the edge of the channel, the second is an instability of the interface between the shear bands. A detailed quantitative comparison of our experimental measurements with a theoretical study of the diffusive Johnson Segalman model leads to excellent agreement. Our study clarifies the nature of shear banding flow instabilities, and shows that, despite the challenging complexity of the situation and the uncertainty regarding their molecular structure, shear banding flows in confined geometries are amenable to quantitative modelling, a feature that opens pathways to their practical utilization.
Ajdari Armand
Fielding Suzanne M.
Nghe P.
Tabeling Patrick
No associations
LandOfFree
Microchannel flow of a shear-banding fluid: enhanced confinement effect and interfacial instability does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Microchannel flow of a shear-banding fluid: enhanced confinement effect and interfacial instability, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microchannel flow of a shear-banding fluid: enhanced confinement effect and interfacial instability will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-296424