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Oilfield Glossary

Newtonian fluid
1.  n.  [Drilling Fluids] ID: 2140

A fluid that has a constant viscosity at all shear rates at a constant temperature and pressure, and can be described by a one-parameter rheological model. An equation describing a Newtonian fluid is given below.
Newtonian fluid

Water, sugar solutions, glycerin, silicone oils, light-hydrocarbon oils, air and other gases are Newtonian fluids. Most drilling fluids are non-Newtonian.

See: capillary tube viscometer, direct-indicating viscometer, Herschel-Bulkley fluid, non-Newtonian fluid, power-law fluid, rheology, shear rate, shear stress, viscosity

Comparison of Newtonian and Non-Newtonian fluids.
(Click to enlarge)


Comparison of Newtonian and Non-Newtonian fluids.



X-Y plot of Newtonian fluids.
(Click to enlarge)


X-Y plot of Newtonian fluids.