Carreau-Yasuda Polymer Viscosity Calculator

Polymer Processing Rheology: Calculate shear-dependent viscosity ($\eta$), transition curvature, and shear stress across 6 decades of shear rate.

Zero-Shear $\eta_0$ (Pa·s):

Infinite-Shear $\eta_\infty$ (Pa·s):

Relaxation Time $\lambda$ (s):

Transition Parameter $a$:

Power-Law Exponent $n$:

Shear Rate $\dot{\gamma}$ (s⁻¹):

Apparent Viscosity ($\eta$)

-- Pa·s

Viscosity Drop: -- %

Shear Stress ($\tau$)

-- kPa

In psi: -- psi

Onset Shear Rate ($\dot{\gamma}_c$)

-- s⁻¹

Regime: --

Weissenberg Number ($Wi$)

Wi = λ · γ_dot

Carreau-Yasuda Formulation:

• $\frac{\eta - \eta_\infty}{\eta_0 - \eta_\infty} = [1 + (\lambda \dot{\gamma})^a]^{(n - 1)/a}$.

• Transition parameter $a$ adjusts the curvature between the zero-shear plateau and the power-law slope ($a=2$ is classic Carreau).

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