Dissipation processes in Langmuir films under lateral compression

The numerical study of the system of hydrodynamic equations that include both director motion and fluid flow, for a number of dynamic regimes in the 4-n-pentyl-4′-cyanobiphenyl multilayer film on the water surface has been carried out. Calculations show that the relaxation time over which the torques exerted per unit LC's volume puts the director nˆ to be normal to the air-water interface, in one order of magnitude less in the case of accounting for the backflow effect than without accounting for that effect. The role of the charged water surface potential on the orientational relaxation process in the 5CB multilayer film on the water surface also has been investigated.