Generalized Newtonian fluid

A generalized Newtonian fluid is an idealized fluid for which the shear stress is a function of shear rate at the particular time, but not dependent upon the history of deformation. Despite this type of fluid is non-Newtonian (i.e. non-linear) in nature, its constitutive equation is a generalised form of the Newtonian fluid. Generalised Newtonian fluids satisfy the following rheological equation:

\tau = \mu_{\operatorname{eff}}( \dot{\gamma} ) \dot{\gamma}

where \tau is the shear stress, and \dot{\gamma} the shear rate. The quantity \mu_{\operatorname{eff}} represents an apparent or effective viscosity as a function of the shear rate.

The most commonly used types of generalized Newtonian fluids are:[1]

See also

References

  1. ↑ Kennedy, Peter (1995). Flow analysis of injection molds. Munich u.a.: Hanser u.a. ISBN 1-56990-181-3.