Green, T. E. and Grassia, P. and Lue, L. and Embley, B. (2009) Viscous froth model for a bubble staircase structure under rapid applied shear : an analysis of fast flowing foam. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 348 (1-3). pp. 49-58. ISSN 0927-7757Full text not available in this repository. (Request a copy from the Strathclyde author)
The viscous froth model is applied to the rapid shear of '2-dimensional', dry foams for bubbles confined in a monolayer and arranged in an ordered staircase configuration that forms part of a hexagonal honeycomb Structure. High system energies are attained as particular films in the staircase become highly elongated under shear. Topological transformations during which bubbles exchange neighbours can relax the staircase energy, but their onset is postponed at high shear rates. Moreover as the imposed shear rate increases, the rate at which topological transformations subsequently occur cannot keep pace with the imposed shear, and secular film stretching onsets. A critical capillary number (a dimension less measure of shear rate) separates a regime where film lengths are periodic functions of imposed strain from a regime of secular growth.
|Keywords:||2-Dimensional foam, foam shear flow, shear-induced breakdown, viscous froth model, mathematical modelling, Physics, Colloid and Surface Chemistry|
|Subjects:||Science > Physics|
|Department:||Faculty of Engineering > Chemical and Process Engineering|
|Depositing user:||Dr Leo Lue|
|Date Deposited:||08 May 2011 12:50|
|Last modified:||05 May 2016 00:07|