Reticulation

This window analyses the paste flow along the defined reticulation path.

1. Use the Annotations tool to draw a polyline along the retic path and save it. Any saved annotation can be used as a retic path.
2. Set the pipe diameter for each segment along the retic path. There is a marker style for diameter in the 3D view. Tick the segment you want to define in the table and assign the appropriate diameter.
3. Define friction loss. Either calculate the friction loss from the Goldsack (1998) relationship or override with a constant friction loss for all pipe segments.

Goldsack (1998) friction loss:

$ΔP/L = 16τ0/3D + 32ηV/D²$

• ΔP/L = Pressure loss per metre
• τ0 = Yield Stress
• D = Pipe inner diameter
• η = Bingham viscosity
• V = Linear flow velocity

The first term (with yield stress) tends to dominate the second term (with viscosity). This is why many people ignore the second term and base the friction loss on yield stress and diameter alone. You have the choice to include the viscosity term or not.

The yield stress can be determined from a shear vane test or a slump test. The calculation of yield stress from the maximum torque of a shear vane test is based on Dzuy and Boger (1983). The yield stress from a modified slump test (cylindrical test) is based on Pashias et al. (1996). The relationship for the generalised slump test (cone) is from Saak et al. (2004)

Dzuy, N.Q. and Boger, D.V., 1983. Yield stress measurement for concentrated suspensions. Journal of Rheology, 27(4), pp.321-349.

Goldsack, D.E. (1998) Elements of Pastefill Rheology, Centre in Mining and Mineral Exploration Research, Laurentian University, Sudbury.

Pashias, N., Boger, D.V., Summers, J. and Glenister, D.J., 1996. A fifty cent rheometer for yield stress measurement. Journal of Rheology, 40(6), pp.1179-1189.

Saak, A.W., Jennings, H.M. and Shah, S.P., 2004. A generalized approach for the determination of yield stress by slump and slump flow. Cement and concrete research, 34(3), pp.363-371.