Evaluation of the Thermodynamic Consistency of Closure Approximations in Several Models Proposed for the Description of Liquid Crystalline Dynamics
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Brian J. Edwards
Abstract
Given the premise that a set of dynamical equations must possess a definite, underlying mathematical structure to ensure local and global thermodynamic stability, as has been well documented, several different models for describing liquid crystalline dynamics are examined with respect to said structure. These models, each derived during the past several years using a specific closure approximation for the fourth moment of the distribution function in Doi's rigid rod theory, are all shown to be inconsistent with this basic mathematical structure. The source of this inconsistency lies in Doi's expressions for the extra stress tensor and temporal evolution of the order parameter, which are rederived herein using a transformation that allows for internal compatibility with the underlying mathematical structure that is present on the distribution function level of description.
Copyright © 2002 by Walter de Gruyter GmbH & Co. KG
Articles in the same Issue
- Evaluation of the Thermodynamic Consistency of Closure Approximations in Several Models Proposed for the Description of Liquid Crystalline Dynamics
- Onset of Free Convection in Solutions with Variable Soret Coefficients
- A Simple Example of Control to Minimize Entropy Production
- Heat-Transfer Effect on the Performance of a Magnetic Ericsson Refrigerator
- Convective Instability in Transient Evaporating Thin Liquid Layers
- Realizability Areas for Thermodynamic Systems with Given Productivity
Articles in the same Issue
- Evaluation of the Thermodynamic Consistency of Closure Approximations in Several Models Proposed for the Description of Liquid Crystalline Dynamics
- Onset of Free Convection in Solutions with Variable Soret Coefficients
- A Simple Example of Control to Minimize Entropy Production
- Heat-Transfer Effect on the Performance of a Magnetic Ericsson Refrigerator
- Convective Instability in Transient Evaporating Thin Liquid Layers
- Realizability Areas for Thermodynamic Systems with Given Productivity
