# Calculation Options Dialog

# Settling Slurries quids When the Slurry module is active a new page - Slurry - is visible in the Calculations Options dialog. Heterogeneous Settling Slurries Correlation: The drop-down menu for heterogeneous slurries allows one of the following correlation methods to be selected: ▪Durand ▪Wasp ▪Wilson, Addie, Sellgren and Clift (WASC) ▪Sellgren, Wilson Four-Component Model ▪Liu Dezhong ▪Vsm ▪V50 ▪4CM Vertical Pipe Friction Loss Correlation: Enable selection of these vertical pipe friction loss correlations: ▪Vertical Pipe WASC Loss ▪4CM ▪Spelay, Gillies, Hashemi and Sanders 2017 Collisional Stress Models Note: When Vsm friction loss is selected, the Vertical Pipe Friction Loss Correlation is automatically set to 4CM as it is the only method that can be simplified to not require particle size data. Inclined Pipe Correlation Selection: Provides the adjustment chart to apply for correcting deposition velocity data against pipe inclination: ▪Wilson - Tse 1984 Chart ▪Extended Wilson - Tse 1984 Chart The Extended Wilson - Tse 1984 chart is an updated version of the earlier model where it accounts for the impact of particle size (d50) to pipe internal diameter ratio (d50/D): ▪At d50 / D ratio < 0.003, no adjustment for deposition velocity is needed ▪At d50 / D ratio > 0.04, adjustment is the same with the Wilson - Tse 1984 chart Note: When Vsm friction loss is selected, Inclined Pipe Correlation Selection is automatically set to Wilson - Tse 1984 Chart as this method does not require particle size data. Deposition Velocity Correlation: FluidFlow includes three options for determining the deposition velocity through Maximum deposition limit velocity (Vsm): ▪WASC Generalized Relationship ▪As a function of particle size (RP King Method) ▪GIW VSCALC 2023 GIW VSCALC 2023, applied as the default method is a systematic application Wilson and Thomas velocity correlations: ▪Wilson – GIW ▪Thomas 1979 ▪Thomas 2015 ▪Wilson 1992 Optional Fields: Depending on the friction loss correlation applied, the following additional items appear/activate on the slurry page of the calculation options dialog box: - V50 Selecting V50 friction loss model would introduce a dropdown field on how V50 and Stratification Ratio Exponent "M" would be defined either as: ▪Calculated ▪User Defined - Durand / Wasp Constant (W) used in the Durand Equation: The value of W is uncertain with values between 65 and 150. A Durand Constant of 82 is widely quoted in literature and this is the value used in FluidFlow. Users can change this value if required. Durand Constant used in WASP Method: The Durand variable used for calculating Vsm with the generalized relationship model. - Version 3.53 (and Older) Friction Loss Correlations Because of solver architecture, selecting any of the following friction loss correlations would set and disable selection of Vertical Pipe Friction Loss method and Inclined Pipe Deposition Velocity Correction: ▪Durand ▪Wasp ▪Wilson, Addie, Sellgren and Clift (WASC) ▪Sellgren, Wilson Four-Component Model ▪Liu Dezhong The following calculation settings will be engaged if any of the above is selected: ▪Vertical Pipe Friction Loss: Vertical Pipe WASC Loss ▪Inclined Pipe Correlation Selection: Wilson - Tse 1984 Chart Assume inclined pipes where elevation differences and pipe lengths indicate this. Adjust pressure losses and deposition velocity calculations for the incline: Inclined pipes are only applicable to WASC method, and it applies a correction factor to pipes from -20 to +80 degree inclination. Above 80 degrees it assumes a vertical pipe and the software applies a different correction factor. Assume particles are spherical in settling and deposition velocity estimations: Solid Shape Factor takes into account the difference in settling velocity between a solid of the same functional diameter in the shape of a sphere and the same solid of an irregular shape. The tick box allows the shape factor to be ignored in a calculation, thereby assuming the particle is spherical. IMPORTANT NOTE When comparing FluidFlow's Slurry module calculations with examples from other programs or references it is important to ensure that those calculations include the shape factor correction, if this correction is included in the FluidFlow calculation. FluidFlow Slurry by default includes shape factor correction; this is not always the case with other calculation methods and examples.