Shear rate and viscosity are related to each other. According to shear rate and viscosity we can classifying the materials especially paints. Fluids are divided into two types like

1.NEWNONION FLUIDS and 2.NON NWETONINON FLUIDS

based on shear rate and viscosity. In fluids if there no change in viscosity with respective shear rate, such type fluids are known as nwetonion fluids.

Viscosity changes with respective shear rate such type of fluids are known as non nwetonion fluids.

Viscosity is constant to the flow of the fluid.

Apha= V drag/ h

all fluids have no shear strergths the rate with that they deform will vary with the fluid.

The zero shear viscosity is the value of the apparent viscosity (quotient between shear stress and shear rate) of a liquid in the limit of zero shear rate (i.e., when the fluid it is at rest). Therefore it is not the result of a direct measure but a calculus or interpolation from experimental results at the lower shear rates values. The most important thing is its physical meaning. It represents the ability of the material to avoid sedimentation when storage. A high zero shear viscosity is interpreted as a the material will show homogeneous during long storage.