期刊
出版社
ROYAL SOC
DOI: 10.1098/rspa.2014.0557
关键词
rheology; particle suspension; bubble suspension; analogue experiments; three phase
资金
- NERC [NE/K500999/1, NE/G014426/1]
- RCUK
- NERC [NE/G014426/1] Funding Source: UKRI
- Natural Environment Research Council [1267898, NE/G014426/1] Funding Source: researchfish
We develop a model for the rheology of a three-phase suspension of bubbles and particles in a Newtonian liquid undergoing steady flow. We adopt an 'effective-medium' approach in which the bubbly liquid is treated as a continuous medium which suspends the particles. The resulting three-phase model combines separate two-phase models for bubble suspension rheology and particle suspension rheology, which are taken from the literature. The model is validated against new experimental data for three-phase suspensions of bubbles and spherical particles, collected in the low bubble capillary number regime. Good agreement is found across the experimental range of particle volume fraction (0 <= phi(p) less than or similar to 0.5) and bubble volume fraction (0 <= phi(b) less than or similar to 0.3). Consistent with model predictions, experimental results demonstrate that adding bubbles to a dilute particle suspension at low capillarity increases its viscosity, while adding bubbles to a concentrated particle suspension decreases its viscosity. The model accounts for particle anisometry and is easily extended to account for variable capillarity, but has not been experimentally validated for these cases.
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