University of Cambridge > Talks.cam > Institute for Energy and Environmental Flows (IEEF) > Flow and Arrest of Very Dense Suspensions

Flow and Arrest of Very Dense Suspensions

Add to your list(s) Download to your calendar using vCal

If you have a question about this talk, please contact Catherine Pearson.

At very high solid volume fractions, many dense suspensions undergo shear thickening. (Wet corn starch is a good example.) Such suspensions flow freely at low stresses but jam up completely if the stress is increased. I will outline a recent theory that explains this sudden transition in terms of a smooth stress dependence of the fraction of interparticle contacts at which friction acts. The resulting flow curves (stress vs shear rate) at first sight suggest that the system could form steady shear-bands oriented along the vorticity direction with coexistence of high stress and low stress material at equal shear rate. Experimentally this is not seen and I will outline tentative arguments, based on the same model, for why the steady shear-banded state might always be replaced by an unsteady flow.

This talk is part of the Institute for Energy and Environmental Flows (IEEF) series.

Tell a friend about this talk:

This talk is included in these lists:

Note that ex-directory lists are not shown.

 

© 2006-2024 Talks.cam, University of Cambridge. Contact Us | Help and Documentation | Privacy and Publicity