Abstract
Abstract Utilization of Ferroelectric Liquid Crystals in a simple new configuration, one rigid surface and the other exposed directly to the flow field, for non-intrusive global as well as local 2D surface stress field determination is reported. Shear flow-field induced optical switching on the boundary layer has been used both in the transmission as well as in the reflection mode operation of the sensor. Characteristics of domain formation in an A - C* and a N* - C* material and the optical response of domains to an applied shear stress in the plane of the C* layers are described. Optical polarization microscopy has been used to measure the transmitted and the reflected light intensities as function of flow parameters. Using micro wind tunnel in conjunction with polarizing microscopy, change in director orientation as a function of the shear stress field has been determined. Director dynamics has been discussed from free energy considerations in the present context.
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