Three numerical solutions of the Leslie–Ericksen equations for low‐molar‐mass rod‐like nematic liquid crystals are obtained for pressure‐driven radial outflow between concentric parallel disks. This radial geometry promotes the director escape from the shear plane; two dissipatively equivalent out‐of‐plane modes appear. The bulk of the flow consist of three distinct regions separated by sharp boundaries. The centerline, elongation‐dominated, region is characterized by complete azimuthal director alignment. The two neighboring regions are shear dominated, and characterized by an in‐plane flow‐aligned director field. The high elastic twist strains are relieved by the nucleation and growth of a twist disclination loop of strength ±1/2 that nucleates in the entrance hole region of the cell. The loop growth transforms the highly twisted out‐of‐plane modes into a twist‐free, flow‐aligned, in‐plane mode.
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August 1990
Research Article|
August 01 1990
Defect‐mediated transition in a nematic flow
Alejandro D. Rey
Alejandro D. Rey
Department of Chemical Engineering, McGill University, Montreal, Quebec, H3A2A7, Canada
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J. Rheol. 34, 919–942 (1990)
Article history
Received:
December 14 1989
Accepted:
April 12 1990
Citation
Alejandro D. Rey; Defect‐mediated transition in a nematic flow. J. Rheol. 1 August 1990; 34 (6): 919–942. https://doi.org/10.1122/1.550106
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