Picture of athlete cycling

Open Access research with a real impact on health...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the Physical Activity for Health Group based within the School of Psychological Sciences & Health. Research here seeks to better understand how and why physical activity improves health, gain a better understanding of the amount, intensity, and type of physical activity needed for health benefits, and evaluate the effect of interventions to promote physical activity.

Explore open research content by Physical Activity for Health...

Viscous froth model for a bubble staircase structure under rapid applied shear : an analysis of fast flowing foam

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 0927-7757

Full text not available in this repository. Request a copy from the Strathclyde author

Abstract

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.