〔113〕定常流下の動的粘性

抄録

Using Oldroyd model, Booij predicted that the dynamic viscosity of a viscoelastic fluid under the superimposed steady shear flow may increase with increasing angular frequency in some frequency ranges.
In the present report, a double cylinder type apparatus was employed to estimate the dynamic viscosity of polyelectrolyte solutions under the steady shear flow. The free damped oscillation of the inner cylinder was recorded by a variable capacitance type transducer under the steady revolution of the outer cylinder.
The effect of the superimposed steady shear on the dynamic viscosity-angular frequency relation in the studied solutions seems to show the validity of the prediction by Booij.
The experimental results also seem to reveal that the dynamic viscosity in usual definition is influenced by structural changes of the material in the oscillating shear, even in small amplitudes.