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Numerical simulations for the rheological characteristics of emulsions under several conditions including temperature, shear rate, surfactant concentration and droplet size
- Source :
- Micro & Nano Letters. 9:896-900
- Publication Year :
- 2014
- Publisher :
- Institution of Engineering and Technology (IET), 2014.
-
Abstract
- An emulsion system was simulated under simple shear rates to analyse its rheological characteristics using the lattice Boltzmann method. The relative viscosity of an emulsion under a simple shear flow along with changes in temperature, shear rate, surfactant concentration and droplet size was calculated. The relative viscosity of emulsions decreased with increase in temperature. The shear thinning phenomena explaining the inverse proportion between shear rate and viscosity were observed. An increase in the surfactant concentration caused an increase in the relative viscosity for a decane-in-water emulsion, because the increased deformation caused by the decreased interfacial tension significantly influenced the wall shear stress. An increase in droplet size caused a decrease in the relative viscosity and smaller shear thinning behaviour because of decreased aggregational and repulsive forces within the emulsion system.
- Subjects :
- Shear thinning
Chemistry
Relative viscosity
Biomedical Engineering
Bioengineering
Apparent viscosity
Condensed Matter Physics
Non-Newtonian fluid
Condensed Matter::Soft Condensed Matter
Physics::Fluid Dynamics
Simple shear
Shear rate
Viscosity
Shear stress
General Materials Science
Composite material
Subjects
Details
- ISSN :
- 17500443
- Volume :
- 9
- Database :
- OpenAIRE
- Journal :
- Micro & Nano Letters
- Accession number :
- edsair.doi...........7b2ad96305659c40882162c3ee721bf2