Convection-roll instability in spite of a large stabilizing torque

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

doi:10.1103/PhysRevE.81.020702

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 journal › Article › peer-review

16 Scopus citations

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 language	English
Article number	020702
Journal	Physical Review E
Volume	81
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevE.81.020702
State	Published - 25 Feb 2010
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics
Statistical and Nonlinear Physics
Statistics and Probability

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10.1103/PhysRevE.81.020702

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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.",

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AU - Kumar, Pramoda

AU - Heuer, Jana

AU - Tóth-Katona, Tibor

AU - Iber, Nándor

AU - Buka, Agnes

PY - 2010/2/25

Y1 - 2010/2/25

N2 - 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.

AB - 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.

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JO - Physical Review E

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Convection-roll instability in spite of a large stabilizing torque

Abstract

ASJC Scopus subject areas

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