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Related Experiment Video

Updated: Jun 14, 2026

Magnetically Induced Rotating Rayleigh-Taylor Instability

Magnetically Induced Rotating Rayleigh-Taylor Instability

Published on: March 3, 2017

Rotational dissipation and the Miesowicz coefficients.

M Simões¹, K Yamaguti, A J Palangana

¹Departamento de Física, Universidade Estadual de Londrina, Campus Universitário, 86051-990 Londrina, PR, Brazil.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|April 7, 2010

Summary

This study quantifies the two dissipative channels influencing nematic liquid crystal viscosity coefficients. A simple relationship reveals their near-constant contribution across the nematic phase.

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Area of Science:

Materials Science
Condensed Matter Physics
Physical Chemistry

Background:

Nematic liquid crystals exhibit complex viscosity behavior.
The Eriksen, Leslie, and Parodi (ELP) approach describes liquid crystal hydrodynamics.
Understanding dissipative processes is crucial for predicting material properties.

Purpose of the Study:

To determine the relative contributions of shear and rotational configurations to nematic liquid crystal viscosity.
To investigate the temperature dependence of these contributions.
To establish a measurable relationship for these contributions.

Main Methods:

Analysis of the fundamental equation for liquid crystal viscosity dissipation.
Identification of shear flow (A(ij)) and rotational (N) characterizing terms.
Derivation of a relationship connecting Miesowicz viscosity coefficients.

Main Results:

Quantified the distinct contributions of shear and rotational dissipative channels.
Demonstrated a simple relationship to measure the relative contributions.
Observed a quasi-temperature independent behavior of this relationship.

Conclusions:

The relative contribution of the two dissipative channels is nearly constant throughout the nematic phase.
This finding simplifies the understanding of viscosity in nematic liquid crystals.
Provides a new perspective on the fundamental dissipative processes in liquid crystals.