The origin of the strain-rate discontinuity in 2D foam rheometry with circular geometry
Denis Weaire, Robert J. Clancy, Stefan Hutzler
TL;DR
This paper explains the strain-rate discontinuity observed in 2D foam rheometry within a circular Couette system using the Herschel-Bulkley continuum model, attributing it to the difference between yield and limit stresses.
Contribution
It provides a theoretical explanation for the strain-rate discontinuity in 2D foam rheometry based on continuum modeling, linking it to stress differences.
Findings
Discontinuity arises from finite yield and limit stress difference
Continuum Herschel-Bulkley model explains the phenomenon
Provides insight into foam rheometry behavior
Abstract
The observed discontinuity in strain-rate for a two-dimensional foam undergoing shear in a (circular) Couette system is explained in terms of the continuum (Herschel-Bulkley) model. It is attributed to the finite difference between yield and limit stress.
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Taxonomy
TopicsRheology and Fluid Dynamics Studies · Polymer Foaming and Composites · Pickering emulsions and particle stabilization