Peculiarities in the orientational dynamics caused by a thermomechanical force in a nematic microfluidic channel

Izabela Śliwa , Alex V. Zakharov

Abstract

We have described a numerical study of the hydrodynamic flow in a hybrid-aligned nematic (HAN) microfluidic channel excited by a thermomechanical force, caused by coupling between gradients of the director field and the vertically applied temperature gradient ∇T. Calculations show that due to the thermomechanical force, the microsized nematic layer being initially in the rest, if heated both from below or above, starts moving in the horizontal direction. It has been shown that the magnitude and direction of the hydrodynamic flow, excited by the vertically applied heat flux q, are influenced both by the magnitude and direction of q, whereas the character of the preferred anchoring of the LC molecules to the restricted surfaces is almost invisible. The role the pretransitional SmA fluctuations in the peculiarities in the relaxation processes, when the temperature on the bounding surfaces is reduced towards TNA, e.g., at a few tens of mK above a nematic-smectic-A (NA) phase transition temperature TNA, for hydrodynamic presmectic regime in 4 − n − octyl − 4′ − cyanobiphenyl HAN microfluidic channel also has been investigated.
Author Izabela Śliwa (WIiGE / KEM)
Izabela Śliwa,,
- Department of Mathematical Economics
, Alex V. Zakharov
Alex V. Zakharov,,
-
Journal seriesJournal of Molecular Liquids, ISSN 0167-7322, e-ISSN 1873-3166, (N/A 100 pkt)
Issue year2020
Vol304
Pages1-8
Publication size in sheets0.5
Keywords in Polishciekły kryształy, dynamika, siła termomechaniczna
Keywords in Englishliquid crystals, microfluidic, thermomechanical force
ASJC Classification1606 Physical and Theoretical Chemistry; 1607 Spectroscopy; 2504 Electronic, Optical and Magnetic Materials; 2505 Materials Chemistry; 3104 Condensed Matter Physics; 3107 Atomic and Molecular Physics, and Optics
DOIDOI:10.1016/j.molliq.2020.112753
URL https://www.sciencedirect.com/science/article/abs/pii/S0167732219367303?via%3Dihub
Languageen angielski
Score (nominal)100
Score sourcejournalList
ScoreMinisterial score = 100.0, 26-04-2020, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.275; WoS Impact Factor: 2018 = 4.561 (2) - 2018=4.136 (5)
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UwagiFirst online: Available online 28 February 2020
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