Physical aspects - Rheology of dispersed systems
10 important questions on Physical aspects - Rheology of dispersed systems
What are 2 types of dispersions of spheres?
- Suspensions of hard spheres
- Emulsions of soft oil droplets
What does hard spheres in a Newtonian liquid apply to?
- Suspensions of solid particles
- Emulsions of highly viscous oils, stabilised by thick protein layer or layer of macromolecules
How is the viscosity of low volume fractions (< 5%) measured?
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What is the relation between the viscosity and the particle volume fraction of low volume fractions (< 5%)?
What is the relation between the viscosity and the particle volume fraction of higher volume fractions (> 5%)?
Which equation can be used to measure the viscosity of higher volume fractions (> 5%)?
What is the maximum amount of particles that can be present in a system with mono disperse hard spheres?
How can the volume fraction sometimes be unknown?
What happens with the Einstein equation in low volume fractions in emulsions?
What happens to the packing of spheres (emulsions) at high volume fractions?
Called a HIPE: High Internal Phase Emulsion (e.g. Mayonnaise).
Resembles shape of foams, which are also hexagonal and have the least amount of surface area.
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