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AFT Fathom: Settling Slurries and Non-Netwonian Liquids

 SSL - Settling Slurry Module

The AFT Fathom Settling Slurry Module is based on the theory presented in 'Slurry Transport Using Centrifugal Pumps' by Wilson, Addie, Sellgen and Clift.

Key features are:

  • Enter properties of solids particles and optionally keep these in a reusable and sharable database.
  • Include slurry pump de-rating using either the Warman or ANSI/HI methods.
  • Display special output reports with im, jm, settling velocity, slurry volume and mass flows and other slurry specific parameters.
  • Quickly evaluate multiple design and operating cases using Scenario Manager.
  • Generate special slurry system curves, critical to understanding important system velocity limits.




 

NSL - Non-Settling Slurry (non-Newtonian Liquids) Module

 

The AFT Fathom Non-Settling Slurry Module extends the capabilites of AFT Fathom to the simulation of non-Newtonian Liquids.

Key features are:

  • Automates the process of determining Power Law and Bingham Plastic constants, avoiding the pitfalls of manual calculations.
  • Accepts and manipulates rheological test data, making it useful for full scale engineering designs, calculations and simulations
  • Adjusts junction and fitting loss data to extend turbulent data into the laminar region, accurately accounting for pressure drop

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 FATHOM: Slurry Module

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Settlng slurry systems present unique challenges in the world of hydraulic system design and simulation. Failure to accurately account for slurry properties, changing concentrations and pump performance effect can lead to plugged pipes, misapplied pumps, increased energy usage, reduced system performance and increased operating and maintenance costs.

The AFT Fathom Settling Slurry module (SSL) addresses the unique challenges of settling slurry system design by bringing the extensive capabilities, flexibility and ease-of-use of AFT Fathom to address these unique engineering challenges.

Specifying slurry properties can be complex and details are not always known so that the AFT Fathom SSL module provides multiple levels of specification detail. The Minimal method can be used in the preliminary design phase where only rough data are available, the Simplified method where additional slurry details are known provides increased accuracy and the Detailed method using the most detail and providing the most rigorous solution methodology.

From new system design to modification or expansion of an existing system to simulating system operation, AFT Fathom with the SSL module provides you the capabilities and flexibility you need in this complex arena of hydraulic analysis.

Non-Newtonian fluids exhibit unusual viscous behavior because the shear rate and shear stress of the fluid are not directly proportional under all conditions. Non-settling slurries are liquids which carry fine particle solids that do not settle to the bottom of a pipe under low flow conditions and behave homogenously. By addressing the frictional effects of these fluids on pipes, valves and fittings when designing a system, the NSL module allows you to manage both of these applications with ease.

Power Law or Bingham Plastic Constants
Manually calculating non-Newtonian Power Law and Bingham Plastic constants based on rheological data can be tedious and error prone. Now you have the choice of directly entering predetermined constants or entering raw rheological data and letting the NSL module calculate them for you.

Scale-up Calculations
The NSL module applies scale-up laws to your test data, making it useful for real world projects and designs. You enter the raw rheological data for a test pipe diameter and the NSL module determines the pressure drop for alternate flows and pipe sizes. Using the graphing capabilities of the NSL module, you can cross-plot the data scaled to other pipe diameters along with the Power Law or Bingham Plastic correlation for comparison purposes

Fitting and Junction Losses
Since non-newtonian fluids and non-settling slurries often operate under laminar flow conditions, the NSL module includes a tool to calculate pressure drop across valves, fittings and equipment. The NSL Module offers you two choices to extend turbulent data into the laminar region:Equivalent Length in Pipe Diameters (L/D) Derived From K Factors - uses junction and fitting loss data for turbulent flow and calculates an effective equivalent length
Non-Newtonian to Newtonian Pipe Friction Ratio Multiplier - uses the friction factor of the adjacent pipe (non-newtonian condition) and determines a ratio using Newtonian methods and your selected viscosity. This ratio is then multiplied by the pressure loss of the relevant fitting or junction.


Click here to see the Slurry brochure.
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 FATHOM: Slurry Module

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