Hybrid Lattice Boltzmann Simulations of Liquid Crystal Emulsions under Shear
| Autor: | Da Re, Marco |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
FIS/03 Fisica della materia
sforzo di taglio deformation cristalli liquidi Lattice Boltzmann ibrido emulsions shear stress Settore FIS/03 - Fisica della Materia Physics::Fluid Dynamics Condensed Matter::Soft Condensed Matter emulsioni liquid crystals deformazione hybrid Lattice Boltzmann cristalli liquidi emulsioni Lattice Boltzmann ibrido sforzo di taglio deformazione liquid crystals emulsions hybrid Lattice Boltzmann shear stress deformation |
| Popis: | In order to study the equilibrium and the rheological properties of binary emulsions of liquid crystals, in this thesis the equilibrium configuration and the effect of a shear flow on a calamitic, lyotropic liquid crystal droplet in the isotropic phase at coexistence with its corresponding nematic phase have been investigated through a hybrid Lattice Boltzmann algorithm. At equilibrium, both the shape of the droplet, corresponding to different values of the physical parameters which govern the system, and the orientation, as well as the order degree of the nematic solvent, have been investigated. Both for a two-dimensional and for a three-dimensional system, the results of the simulations have shown that the shape of the droplet is determined, essentially, by the relative values of the surface tension, the nematic anchoring strength at the interface, and the elastic forces opposing distortions inside the nematic phase. To all the simulated droplets a shear stress have been imposed, then, and the deformations have been examined: several features which are absent in emulsions of Newtonian or viscoelastic fluids have been observed, and are often related to the presence of topological defects. |
| Databáze: | OpenAIRE |
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