Orientational transition in nematic liquid crystals under oscillatory Poiseuille flow

Details Orientational transition in nematic liquid crystals under oscillatory Poiseuille flow Orientational transition in nematic liquid crystals under oscillatory Poiseuille flow

1999-11-24

arxiv.org/abs/cond-mat/9911397v1

Physics

Condensed Matter

Soft Condensed Matter

11 pages, 4 figures, submitted to Europhys. Lett

Scientific paper

10.1209/epl/i2000-00336-3

We investigate the orientational behaviour of a homeotropically aligned nematic liquid crystal subjected to an oscillatory plane Poiseuille flow produced by an alternating pressure gradient. For small pressure amplitudes the director oscillates within the flow plane around the initial homeotropic position, whereas for higher amplitudes a spatially homogeneous transition to out-of-plane director motion was observed for the first time. The orientational transition was found to be supercritical and the measured frequency dependence of the critical pressure amplitude in the range between 2 and 20 Hz was in quantitative agreement with a recent theory.

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