Dynamo-optical coefficient

In this case, it is convenient to characterise the behaviour of the system by the dynamo-optical coefficient... 

One can turn to discussion of the dynamo-optical coefficient, defined by equation (10.22). The expression for the relative permittivity tensor (10.10) and equation (2.41) for the moments allow one to write... 

The stress-optical coefficient C is defined by equation (10.27) and the relaxation times t,1 and t][ are defined by relations (2.30). One can see that the dynamo-optical coefficient of dilute polymer solutions depends on the non-dimensional frequency t w, the measure of internal viscosity ip and indices zv and 6... 

For the components of dynamo-optical coefficient, one can find the equations, established by Thurston and Peterlin (1967),... 

One can see that, in the case when the intramolecular viscosity is neglected i Pi = 0), the frequency dependence of the components of the dynamo-optical coefficient (10.32) agrees with the analogous dependence of the shear viscosity (see equation (6.20) and Fig. 14). The stress-optical law can be written in the form... 

The work by Lodge et al. (1982) contains the experimental data on the frequency dependencies of the dynamo-optical coefficient for infinitely dilute solutions of polymer, which are represented as frequency dependence of the magnitude and the phase angle, respectively... 

Dynamo-optical and strain-optical coefficients can be estimated from measurements of birefringence An under elongational flow or shear flow, correspondingly... 

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