The journal club is intended to be a weekly natter about interesting recent research. We tend to stick to high-impact journals - Nature, Science, PNAS and PRL have been popular - but this is not prescriptive. Given the diversity of research in the CM group, chosen topics vary widely. Anyone and everyone is welcome: if you have a paper you want to discuss, email it to me (Joe Tavacoli
) and I'll slot you in.
Week beginning 19 May 2013
Wednesday 22 May 13 - 11:30am
To be confirmed
Friday 24 May 13 - 11:30am
Speeding up of Sedimentation under Confinement
Authors: S. Heitkam, Y. Yoshitake, F. Toquet, D. Langevin, A. Salonen
Speaker: Juho Lintuvuori
We show an increase of the sedimentation velocity as small particles are confined in circular capillaries. In general, confinement slows down sedimentation. But, we show that at low Reynolds numbers and in 1D confinement this is not the case. Particle sedimentation velocity is not homogeneous, which can lead to the formation of structures. These structures are enhanced and stabilized in the presence of walls and in the absence of other dissipative mechanisms. As a consequence, it is possible to achieve sedimentation velocities that even exceed the Stokes velocity. The segregation at critical capillary diameters has been directly observed using a large scale model. These simple experiments offer a new insight into the old problem of sedimentation under confinement.
article 178302 (2013) pdf version
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