Carreau fluid

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Carreau fluid is a type of generalized Newtonian fluid where viscosity, , depends upon the shear rate, , by the following equation:

Where: , , and are material coefficients.

= viscosity at zero shear rate (Pa.s)

= viscosity at infinite shear rate (Pa.s)

= relaxation time (s)

= power index


At low shear rate () Carreau fluid behaves as a Newtonian fluid and at high shear rate () as a power-law fluid.

The model was first proposed by Pierre Carreau.

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