Predicting Steady Shear and Dynamic Viscoelastic Properties of Guar and Carrageenan Using the Bird‐Carreau Constitutive Model

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Abstract
The Bird Carreau constitutive model, a five parameter semi‐empirical set of equations, was used to predict the steady shear viscosity, η′, the dynamic viscosity, η″, and the out‐of‐phase component of the complex viscosity divided by frequency, η″/ω. For most of the frequency/shear rate region in the range 0.1 ‐ 100 set−1 for 1% and 1.25% guar, the models accurately predicted the experimental data. η″/ω data for 2.0% and 2.5% carrageenan dispersions were predicted accurately in the high frequency region but were not successfully simulated in the low shear rate/frequency region.

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