Types of non Newtonian fluids with examples

Описание: Newtonian fluids are the most basic mathematical representations of liquids that take into account viscosity. Whereas no actual fluid exactly meets the criteria, many prevalent liquids and gases, such as water and air, can be considered to be Newtonian fluids. Non-Newtonian fluids, on the other hand, are rather prevalent.

Different types of non-Newtonian fluids

When stressed, not all non-Newtonian fluids react the same way; some become more solid, while others become more fluid. The characteristics of non-Newtonian fluids may change depending on the amount of stress applied or else on the duration the stress is applied. Due to different characteristics of these non-Newtonian fluids, they are categorized into several groups.

1 Thixotropic – this means the fluid behaves like a solid when it is kept still and becomes liquid when shaken. In other words, the viscosity of the fluid decreases when stress is applied for a prolonged duration of time. Honey is a perfect example for this. When stirred continuously honey becomes more liquid in its character. Yoghurt, peanut butter and most gels act in this manner. Thixotropic is a type of time dependent viscosity.

2 Rheopectic – this means the fluid acts as a liquid but when stress is applied it becomes more solid. In other words, the viscosity of the fluid increases when stress is applied for a prolonged time duration. Cream and gypsum paste are common examples for this kind of non-Newtonian fluid. When stress is applied continuously these fluids become more solid in its behavior. Rheopectic is a type of time dependent viscosity.

3 Shear thinning – this means the viscosity of the fluid decreases with powerful stress. It is the amount of stress that matters rather than the duration. Nail polish, ketchup, blood and silicone oils are different examples for shear thinning non-Newtonian fluids.

4 Shear thickening or dilatant – this means the viscosity increases with powerful stress. It is the amount of stress that matters rather than the duration. Cornstarch in water (known as oobleck) is a popular example for dilatants.


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