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Effect of electric field and temperature gradient on the orientational dynamics of liquid crystals in a microvolume cylindrical cavity

J. Chem. Phys. 131, 164902 (2009); doi:10.1063/1.3251768

Published 23 October 2009

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A. V. Zakharov,1 A. A. Vakulenko,1 and Silvano Romano2
1Saint Petersburg Institute for Machine Sciences, Russian Academy of Sciences, Saint Petersburg 199178, Russia
2Dipartimento di Fisica “A. Volta” e Unità di Ricerca CNISM, Università di Pavia, via A. Bassi 6, I-27100 Pavia, Italy
We have considered a homogeneously aligned liquid crystal (HALC) microvolume confined between two infinitely long horizontal coaxial cylinders and investigated dynamic field pumping, i.e., studied the interactions between director, velocity, and electric E fields as well as a radially applied temperature gradient [del]T, where the inner cylinder is kept at a lower temperature than the outer one. In order to elucidate the role of [del]T in producing hydrodynamic flow u, we have carried out a numerical study of a system of hydrodynamic equations including director reorientation, fluid flow, and temperature redistribution across the HALC cavity. Calculations show that only under the influence of [del]T does the initially quiescent HALC sample settle down to a stationary flow regime with horizontal component of velocity ueq(r). The effects of [del]T and of the size of the HALC cavity on magnitude and direction of ueq(r) have been investigated for a number of hydrodynamic regimes. Calculations also showed that E influences only the director redistribution across the HALC but not the magnitude of the velocity ueq(r). ©2009 American Institute of Physics
History: Received 18 August 2009; accepted 29 September 2009; published 23 October 2009
Permalink: http://link.aip.org/link/?JCPSA6/131/164902/1
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KEYWORDS and PACS

Keywords
PACS
  • 61.30.Gd
    Orientational order of liquid crystals in electric and magnetic fields
  • 61.30.Pq
    Microconfined liquid crystals
  • 47.61.-k
    Micro- and nano-scale flow phenomena
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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