What is a Newtonian and non-Newtonian fluid?

What is a Newtonian and non-Newtonian fluid?

Newtonian fluids obey Newton’s law of viscosity. The viscosity is independent of the shear rate. Non-Newtonian fluids do not follow Newton’s law and, thus, their viscosity (ratio of shear stress to shear rate) is not constant and is dependent on the shear rate.

What are examples of Newtonian and non-Newtonian fluids?

A key statement is “The viscosity is a function only of the condition of the fluid, particularly its temperature.” Water, oil, gasoline, alcohol and even glycerin are examples of Newtonian fluids. Examples of non-Newtonian fluids are slurries, suspensions, gels and colloids.

Who discovered non-Newtonian fluid?

physicist Sir Isaac Newton
Newtonian fluids and non-Newtonian fluids are so named because of physicist Sir Isaac Newton. Newton, among his many well-known accomplishments (including the discovery of gravity), also discovered the basic principles of viscosity.

What is rheology explain Newtonian and non-Newtonian system?

In a Newtonian fluid, the relation between the shear stress and the shear rate is linear, passing through the origin, the constant of proportionality being the coefficient of viscosity. In a non-Newtonian fluid, the relation between the shear stress and the shear rate is different.

Why is it called non-Newtonian?

remains constant, no matter how fast they are forced to flow through a pipe or channel. But the viscosity of some fluids is affected by factors other than temperature. These fluids are termed non-Newtonian fluids.

Why is rheology important in pharmacy?

Rheology is therefore crucially important as it will directly affect the way a drug is formulated and developed, the quality of the raw and finished product, the drug efficacy, the way a patient adheres to the prescribed drug, and the overall healthcare cost.

What is meant by non-Newtonian fluid?

A non-Newtonian fluid is a fluid that does not follow Newton’s law of viscosity, i.e., constant viscosity independent of stress. In non-Newtonian fluids, viscosity can change when under force to either more liquid or more solid. Ketchup, for example, becomes runnier when shaken and is thus a non-Newtonian fluid.

Why is it called Newtonian fluid?

Newtonian fluids are the simplest mathematical models of fluids that account for viscosity. Newtonian fluids are named after Isaac Newton, who first used the differential equation to postulate the relation between the shear strain rate and shear stress for such fluids.

Why is it called non Newtonian?

What are the types of Newtonian fluids?


  • Water.
  • Mineral oil.
  • Gasoline.
  • Alcohol.

What are the uses of non-Newtonian fluids?

This chapter discusses various applications of non-newtonian fluid flow. These include non-newtonian fluid friction reduction, oil-pipeline friction reduction, surfactant applications to large-scale heating and cooling systems, scale-up, and flow tracers.

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