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Flow curve model function with “viscosity factor” c1 [Pas], “numerator coefficient” c2 [s2] and

“denominator coefficient” c3 [s2].

Assumptions: For very low shear rates the viscosity plateau value c1 is reached, corresponding to η0; and for very high shear rates the viscosity plateau value is (c1 ⋅ c2/c3) [Pas], corresponding to η∞.