Carreau-Yasuda Viscosity Model Calculator
Polymer melt rheology: Model shear-thinning fluid flow across the Newtonian plateau, transition knee, and power-law regions using the 5-parameter Carreau-Yasuda equation.
Carreau-Yasuda Model Parameters
Low-shear Newtonian plateau
High-shear limit (often ~0)
Relaxation time (1/γ_crit)
Shear thinning (n < 1)
a = 2 corresponds to classic Carreau model
Operating Shear Rate
Extrusion: 100–1000 s⁻¹; Injection: 10³–10⁵ s⁻¹
Apparent Viscosity & Shear Stress Output
Apparent Viscosity η:
--
Pa · s
Shear Stress τ:
--
kPa (τ = η · γ̇)
Weissenberg Wi:
--
λ · γ̇
Viscosity Drop:
--
% from η₀
Dissipation:
--
kW / m³ (viscous heat)
Flow Regime Classification
Current Rheological Regime:
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Critical Transition Shear Rate $\dot{\gamma}_c = 1/\lambda$:
--
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