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Mathematical flow models evaluated in viscosity studies
| Flow model name | Flow model equation | R 2 | Calculated equation |
|---|---|---|---|
| Bingham | τ = τ + ηγ | 0.7985 | τ = 386.95 + 1.29γ |
| Casson | τ = τ00.5 + η0.5 γ0.5 | 0.9527 | τ = 21.36 + 0.95 γ0.5 |
| Ostwald–De Waele | τ = k γn | 0.9938 | τ = 149 γ0.3165 |
| Herschel–Bulkley | τ = τ0 + ηγn | 0.9681 | τ = 5.69 + 178.49 γ0.3547 |
Where τ is the shear stress, τ0 is the yield stress, η is the viscosity, k is the index of consistency, n is the flow index, and γ is the shear rate.
