Flow-induced delayed Freedericksz transition

Mottram, N.J., McKay, G., Brown, C.V. ORCID: 0000-0002-1559-3238, Russell, C.T., Sage, I.C. and Tsakonas, C. ORCID: 0000-0002-7342-3405, 2016. Flow-induced delayed Freedericksz transition. Physical Review E, 93 (3), 030701(R). ISSN 2470-0045

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We demonstrate that a compact manometer experiment allows direct observation of a delay to the classical electric-field-induced Freedericksz transition produced by flow in a highly dispersive nematic liquid crystal layer. The Ericksen-Leslie equations are used to show that a flow aligning torque generated in the nematic layer under Poiseuille flow competes with the orthogonal electric-field reorientation torque. This model fully reproduces the experimental results using only self-consistently determined viscosity values, and predicts a more generally applicable expression for the dependence of the delay Ec∝√ζ/Δχe on the shear rate ζ and on the electric susceptibility anisotropy Δχe.

Item Type: Journal article
Publication Title: Physical Review E
Creators: Mottram, N.J., McKay, G., Brown, C.V., Russell, C.T., Sage, I.C. and Tsakonas, C.
Publisher: American Physical Society
Date: 15 March 2016
Volume: 93
Number: 3
ISSN: 2470-0045
Divisions: Schools > School of Science and Technology
Record created by: Jonathan Gallacher
Date Added: 25 Jul 2016 09:30
Last Modified: 04 Feb 2022 14:37
URI: https://irep.ntu.ac.uk/id/eprint/28183

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