Dissipation dynamics in the hybrid-oriented compressible liquid crystal cell

The theoretical description of the reorientational dynamics and the relaxation processes in the hybrid-oriented compressible liquid crystal (HOCLC) cell under the influence of the vertical temperature gradient has been presented. We have carried out a numerical study of the system of hydrodynamic equations including director reorientation, fluid flow, and both the temperature and density redistribution across a HOCLC cell under the influence of a temperature gradient ▽T directed normal to the restricting surfaces, when the sample was heated both from below and above. Calculations show that, under the influence of ▽T, the HOCLC sample settles down to a stationary flow regime, both with the horizontal u and vertical w components of velocity v, and u is directed in the opposite direction, with, approximately, one order of the magnitude less, than one in the case of the incompressible hybrid-oriented liquid crystal cell. The role of hydrodynamic flow in the relaxation processes of the stress tensor components, for a number of dynamic regimes in a HOCLC cell containing 4-n-pentyl-4′-cyanobiphenyl, has been investigated.