Measurements of Leslie coefficients

It would be very instructive to relate the experimental (Miesowicz) and theoretical (Leslie) coefficients of viscosity. Our task now is to use the viscous tensor (9.20) and find the relationships between the coefficients for each of the three basic orientations of the director, namely = 1, iiy = 1, or = 1. At first, we shall prepare some combinations of parameters useful in all the geometries mentioned  

As we have only one component of shear dvjdy the tensor of shear (9.12) for  

Director velocity N (9.19) in the steady state conditions dnldt=0)  

Now we are ready to consider the three geometries with different director alignment marked by symbols with letters n, tty, in Fig. 9.3. 

In this case n = riy =0. Hence, N = 0 and terms with coefficients 2 and 3 in viscous tensor (9.20) vanish. Terms with 5, ocg also disappear because vector ripA y has only X- and y-components and forms zero scalar product with = (0,0,1). The 

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