Driven active and passive nematics
arXiv:1504.06690 · doi:10.1080/00268976.2015.1031840
Abstract
We investigate similarities in the micro-structural dynamics between externally driven and actively driven nematics. Walls, lines of strong deformations in the director field, and topological defects are characteristic features of an active nematic. Similar structures form in driven passive nematics when there are inhomogeneities in imposed velocity gradients due to non-linear flow fields or geometrical constraints. Specifically, pressure driven flow of a tumbling passive nematic in an expanding-contracting channel produces walls and defects similar to those seen in active nematics. We also study the response of active nematics to external driving, confirming that imposed shear suppresses the hydrodynamic instabilities. We show that shear fields can lead to wall alignments and the localisation of active turbulence.
Molecular Physics
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Cited by in corpus (9)
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- Cross-talk between topological defects in different fields revealed by nematic microfluidics
- Microfluidic Flow of Cholesteric Liquid Crystals
- Hydrodynamic theory of atic liquid crystals
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