Nematic liquid crystals under oscillatory shear flow

A. P. Krekhov, T. Börzsönyi, P. Tóth, A. Buka, L. Kramer

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

This contribution deals with three types of orientational phenomena generated by oscillatory flow in nematic liquid crystals: (1) Uniform orientational instabilities in the geometry where the director is initially oriented within the flow plane. The instability occurs under rectilinear Poiseuille flow and not under Couette flow. (2) The first instability under rectilinear Couette flow is a bifurcation to a stationary roll pattern with the roll axis perpendicular to the flow direction. The threshold amplitude has been measured for homeotropic alignment and calculated by linear stability analysis. (3) An interesting slow director precession and nonlinear waves which arise in homeotropically aligned nematics exposed to an elliptical shear flow in the bend Fréedericksz distorted state. The experimental data are compared with a theoretical analysis. The precession can also be generated by oscillatory compression.

Original languageEnglish
Pages (from-to)171-192
Number of pages22
JournalPhysics Reports
Volume337
Issue number1-2
Publication statusPublished - Oct 2000

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shear flow
liquid crystals
Couette flow
precession
laminar flow
alignment
thresholds
geometry

Keywords

  • 05.45. - a
  • Instability of shear flows
  • Liquid crystals
  • Pattern formation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Krekhov, A. P., Börzsönyi, T., Tóth, P., Buka, A., & Kramer, L. (2000). Nematic liquid crystals under oscillatory shear flow. Physics Reports, 337(1-2), 171-192.

Nematic liquid crystals under oscillatory shear flow. / Krekhov, A. P.; Börzsönyi, T.; Tóth, P.; Buka, A.; Kramer, L.

In: Physics Reports, Vol. 337, No. 1-2, 10.2000, p. 171-192.

Research output: Contribution to journalArticle

Krekhov, AP, Börzsönyi, T, Tóth, P, Buka, A & Kramer, L 2000, 'Nematic liquid crystals under oscillatory shear flow', Physics Reports, vol. 337, no. 1-2, pp. 171-192.
Krekhov AP, Börzsönyi T, Tóth P, Buka A, Kramer L. Nematic liquid crystals under oscillatory shear flow. Physics Reports. 2000 Oct;337(1-2):171-192.
Krekhov, A. P. ; Börzsönyi, T. ; Tóth, P. ; Buka, A. ; Kramer, L. / Nematic liquid crystals under oscillatory shear flow. In: Physics Reports. 2000 ; Vol. 337, No. 1-2. pp. 171-192.
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