Breakup of a capillary bridge of suspensions
| Autor: | Alexandrou, Andreas N., Bazilevskii, A. V., Entov, V. M., Rozhkov, A. N., Sharaf, A. |
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| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Materials science
Suspension viscosity Thinning process genetic structures Capillary action Capillary bridges General Physics and Astronomy Viscous liquid breakup Rheological behaviors Viscosity Rheology Stretching rates Newtonian fluid suspension Composite material bridge Suspension (vehicle) Fluid Flow and Transfer Processes Drop breakup Suspensions (fluids) Plastic materials Mechanical Engineering Newtonian viscous fluid experiments stretching Breakup Bridges eye diseases Shear (sheet metal) Classical mechanics viscosity droplet Drops Effective viscosity |
| Zdroj: | Fluid Dynamics |
| Popis: | The breakup of liquid bridges under the action of capillary forces is used for studying the rheology of suspensions under stretching. The experiments were performed with suspensions of finegrained (3-30 μm) sand in glycerin for sand volume fractions up to 0.465. The bridge thinning process was registered using an electro-optical measuring device and videofilming. The results were analyzed on the basis of a theory developed earlier for the thinning of a liquid bridge under the action of capillary forces. It is found that, for fairly slow stretching realized in the initial stage of the thinning, the rheological behavior of the suspensions considered agrees with the model of a Newtonian viscous fluid. Along with this, the measured effective viscosity of the suspension turned out to be approximately two-fold greater than the suspension viscosity under shear. The origin of this discrepancy is analyzed. With increase in the stretching rate, in the final stage of the thinning, the weakening of the suspension occurs, which is manifested in the formation of a local rapidly thinning neck in the bridge, similar to that observed in the breakup of plastic materials. © 2010 Pleiades Publishing, Ltd. 45 952 964 952-964 |
| Databáze: | OpenAIRE |
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