33.4.18 Herschel-Bulkley Dialog Box

The Herschel-Bulkley dialog box allows you to set the parameters for the non-Newtonian Herschel-Bulkley model for viscosity. This dialog box will open when you select herschel-bulkley in the drop-down list next to Viscosity in the Create/Edit Materials dialog box. See Section  8.4.5 for details about the items below.

Controls

Methods   allows you to select the type of dependency on the viscosity.

Shear Rate Dependent   is where the viscosity is dependent on the shear rate.

Shear Rate and Temperature Dependent   is where the viscosity is dependent on the shear rate and the temperature.

Consistency Index   sets the consistency index $k$ in Equation  8.4-24.

Power-Law Index   sets the power-law index $n$ in Equation  8.4-24.

Yield Stress Threshold   sets the yield stress threshold $\tau_0$ in Equation  8.4-24.

Critical Shear Rate   set the critical shear rate $\dot{\gamma_c}$ in Equation  8.4-24.

Reference Temperature, T_alpha   sets the reference temperature $T_0$ in Equation  8.4-21.

Activation Energy/R, alpha   is the ratio of the activation energy to the thermodynamic constant $\alpha$ in Equation  8.4-19.