Micro-channel flow of high volume fraction colloidal glasses: velocity profiles, fluctuations and Antoni Gaudi

Condensed Matter lunchtime seminar

Micro-channel flow of high volume fraction colloidal glasses: velocity profiles, fluctuations and Antoni Gaudi

  • Event time: 1:00pm
  • Event date: 12th February 2007
  • Speaker: Lucio Isa (University of Edinburgh)
  • Location: Room 2511,

Event details

I will briefly draw the attention on some features of the works of Antoni Gaudi' to move then to the description of some recent result on micro-channel flows of dense colloidal suspensions.

We image the flow of a hard-sphere suspension at nearly random close packing (a 'paste') in a square capillary at single-particle resolution using confocal microscopy. Both smooth and rough boundary conditions are studied. The center of the suspension flows as a 'plug', but the suspension adjacent to the channel walls sustains finite shear. The observed velocity profiles are not typical of 'yield stress fluids', but can be fitted using a theory of stress fluctuations originally developed for chute flow of dry granular media.

But what do colloidal partciles flowing in capillaries and the Catalan architect have in common?

Well, come along and see.

This is a weekly series of informal talks given primarily by members of the soft condensed matter and statistical mechanics groups, but is also open to members of other groups and external visitors. The aim of the series is to promote discussion and learning of various topics at a level suitable to the broad background of the group. Everyone is welcome to attend..

Find out more about Condensed Matter lunchtime seminars.