The rheological description of a non-Newtonian liquid and CFD codes

Usually mathematical models (or constitutive equations) that are of the following kind can describe the rheological properties of a liquid  

All the codes listed provide a wide range of inelastic models, which adequately cover such liquids as dispersions and emulsions, but the kinds of hquids foimd in the polymer, personal-product, detergent, pharmaceutical and general chemicals industries might need viscoelastic models, and these presently are only provided by the POLYFLOW code. 

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