Nematic liquid crystals under decay pouseuille flow: New possibilities formeasurement of shear viscosity

The results of the optical investigation of a decay shear flow of a nematic liquid crystal are presented. The now was produced by the varying hydrosta tic pressure difference applied to the rectangular capillary. in the descri bed experiment a quasi-stationary director motion took place. It allowed to control a pressure difference due to a measurement of an intensity of ligh t, passing through the cell. The proposed procedure can be used to determin e the shear viscosity of nematic liquid crystals.