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Ellis: τ = η0 ⋅ γ ̇ + c ⋅ γ ̇ pandSisko: τ = c ⋅ γ ̇ p + η∞ ⋅ γ ̇

Flow curve model functions with “consistency” c and “index” p.

These model functions are especially designed to describe the behavior at low shear rates (according to Ellis, in 1927 [3.50]), and at high shear rates (acc. to Sisko, in 1958 [3.51).