Two Simple Time-Shear Rate Relations Combining Viscosity and First Normal Stress Coefficient in the Linear and Non-Linear Flow Range
The theory of linear viscoelasticity is able to describe the time dependent flow behaviour of viscoelastic liquids in the range of small shear rates K. Using a memory function, defined for example in 1, with a suitable set of constants the transient zero viscosity ηo(t,K→O) can be calculated. The theory of linear viscoelasticity however, predicts no shear rate dependency of the viscosity as aobserved for nearly all polymers at higher shear rates.
KeywordsShear Rate High Shear Rate Constant Shear Rate Viscoelastic Liquid Viscosity Function
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