title: Liquid-crystal pumping in a cylindrical capillary with radial temperature gradient.
abstract: Dynamic field pumping principle has been developed utilizing the interactions of both the director and velocity fields and a temperature gradient inverted deltaT. The orientational dynamics in the hybrid-oriented liquid-crystal (HOLC) microvolume confined between two infinitely long coaxial cylinders under the influence of the radially directed inverted deltaT has been investigated. We have carried out a numerical study of a system of hydrodynamic equations including director reorientation, fluid flow, and temperature redistribution across the HOLC cavity between two cylinders under the influence of inverted deltaT, when the liquid-crystal cavity is heated both from outer (inner) to inner (outer) bounding cylinders. Calculations show that under the influence of inverted deltaT the initially quiescent HOLC drop settles down to a stationary flow regime, with the horizontal u(st)(r) component of velocity. The effects of inverted deltaT , of the character of the preferred anchoring of the average molecular direction to the restricted cylinders, and of the size of the HOLC cavity on magnitude and direction of hydrodynamic flow--for a number of hydrodynamic regimes--has been investigated.
authors.affiliation: Saint Petersburg Institute for Machine Sciences, The Russian Academy of Sciences, Saint Petersburg 199178, Russia. mveum@uwsp.edu
authors.forename: A V
authors.initials: AV
authors.lastname: Zakharov
authors.forename: A A
authors.initials: AA
authors.lastname: Vakulenko
mesh_terms: D001713:Biphenyl Compounds / Q000737:chemistry; D050866:Liquid Crystals / Q000737:chemistry*; D013696:Temperature; D013814:Thermal Conductivity
chemical_list: D001713:Biphenyl Compounds; C010574:biphenyl