Convection-roll instability in spite of a large stabilizing torque

Pramoda Kumar, Jana Heuer, Tibor Tóth-Katona, Nándor Iber, Agnes Buka

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Two electroconvection (EC) pattern morphologies-a cellular and a subsequent roll pattern-have been detected in the same frequency range in a nematic with positive permittivity and conductivity anisotropies. The frequency dependences of the onset voltages and critical wave numbers have been determined both for homeotropic and planar alignments. It has been proven that both pattern morphologies have a dielectric time symmetry. We also discuss possible sources for the pattern formation in the frame of both the isotropic (Felici-Benard) mechanism, as well as the standard model of EC.

Original languageEnglish
Article number020702
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume81
Issue number2
DOIs
Publication statusPublished - Feb 25 2010

Fingerprint

Torque
Convection
torque
convection
Permittivity
Pattern Formation
Conductivity
Standard Model
Anisotropy
Alignment
Voltage
Symmetry
frequency ranges
alignment
permittivity
Range of data
conductivity
anisotropy
electric potential
symmetry

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Statistical and Nonlinear Physics
  • Statistics and Probability

Cite this

Convection-roll instability in spite of a large stabilizing torque. / Kumar, Pramoda; Heuer, Jana; Tóth-Katona, Tibor; Iber, Nándor; Buka, Agnes.

In: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, Vol. 81, No. 2, 020702, 25.02.2010.

Research output: Contribution to journalArticle

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