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Grassia, Paul
University of Strathclyde
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 2022Squeeze film flow of viscoplastic Bingham fluid between non-parallel plates
- 2022Squeeze film flow of viscoplastic Bingham fluid between non-parallel platescitations
- 2019Foam stability influenced by displaced fluids and by pore size of porous mediacitations
- 2013Prediction of thickener performance with aggregate densificationcitations
- 2009Viscous froth model for a bubble staircase structure under rapid applied shearcitations
- 2006Mechanisms for the onset of convective instability in foamscitations
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article
Mechanisms for the onset of convective instability in foams
Abstract
We introduce new mechanisms for the onset of convective motion in loaded 3D foams. This is done by balancing gravity and capillarity along a liquid-filled channel for a microstructural model of foam drainage; the weight of this non-uniform-area channel is then used to predict the onset of instability. The predictions of these models are not very different from the gravitational model, although they do allow for the concept of localized deformation and shearing of a foam. Comparison is made to existing experimental data by incorporating the dependence of yield stress on liquid fraction, which is found to have a large effect on onset.