A non-Newtonian fluid is a liquid whose flow properties are not described by a single constant value of viscosity. Examples of non-Newtonian fluids are; polymer solutions, starch suspensions, paint, blood, food products and mining suspensions of densely packed particles.
The relation between the shear stress and the strain rate is nonlinear, which means that a constant coefficient of viscosity cannot be defined. FluidFlow allows you to describe this relationship of shear-dependent viscosity, according to any of the following rheology models:
- Bingham Plastic
- Power Law
- Hershel Bulkley
- Casson
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Power law modelling of rheology data
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The example opposite shows viscometer data for a non-Newtonian fitted to a Power Law relationship.
FluidFlow uses different friction factor relationships for each available model, the relationships are valid over all flow regimes.
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