# Non-Newtonian Liquids

# Non-Newtonian / non-settling liquids Non-Newtonian / non-settling liquids may be broadly divided into three types: ▪Bingham plastics which exhibit a linear relationship between shear stress and rate of strain but which do not exhibit a zero intercept at zero strain rate, i.e., they have yield stress. ▪Pseudo-plastic which exhibit a non-linear stress/strain relationship with zero intercept on the stress/strain relationship. ▪Yield pseudo-plastic which exhibit a non-linear stress/strain relationship but which do not exhibit a zero intercept at zero strain rate, i.e., they have yield stress. Pipe friction loss models for these type flows are well established - Bingham, power-law for pseudo-plastic and Herschel-Bulkley for yield pseudo-plastic. Each of these friction loss modules is available in the Slurry module. Shear rate vs. Stress and the consequential Shear rate vs. Viscosity for each non-settling type is shown below: Settling slurries comprise a Newtonian "carrier fluid" conveying solid particles. Friction loss is a complex function of: ▪Carrier fluid characteristics ▪Solids characteristics ▪Flow rate ▪Pipe inclination Pipe friction loss models are based on empirical data. The Slurry module allows for use of any one of five pressure loss models: ▪Durand ▪Wasp ▪Wilson, Addie, Sellgren and Clift (WASC) - This is the default calculation method. ▪Sellgren, Wilson Four-Component Model ▪Liu Dezhong