Angular and temperature dependence of viscosity coefficients in a plane normal to the direction of flow in MBBA

Publisher Website
Google Scholar
Abstract
The temperature dependence of the viscosity coefficients η1 and η3 of the liquid crystal MBBA has been measured. The temperature range was from 23 to 50 °C. A magnetic field was used to orient the liquid crystal. The results are η1=1.54 P and η3=0.79 P at 23 °C in disagreement with earlier studies. Possible factors contributing to this disagreement are discussed. The angular dependence of the viscosity coefficient in a plane normal to the flow direction is found to be in good agreement with Leslie’s theory of anisotropic fluids. The method employed is a direct measurement of viscous force at a very low shear rate.