What is pseudoplastic fluid?
Pseudoplastic fluids are shear thinning fluids, the opposite. The viscosity of these fluids decreases as the shear rate increases. These types of fluids are much more common than dilatant fluids and naturally occurring examples include quicksand, blood, and milk.
What is pseudoplastic Behaviour?
In rheology, shear thinning is the non-Newtonian behavior of fluids whose viscosity decreases under shear strain. It is sometimes considered synonymous for pseudoplastic behaviour, and is usually defined as excluding time-dependent effects, such as thixotropy.
What is pseudoplastic rheology?
A descriptive term for a fluid with shear-thinning characteristics that does not exhibit thixotropy. Pseudoplastic rheology, low viscosity at high shear rates and high viscosity at low shear rates, benefits several aspects of drilling-higher drilling rate and improved cuttings lifting.
What are the different types of non-Newtonian fluids?
Different types of non-Newtonian fluids
| Type of behaviour | Description |
|---|---|
| Thixotropic | Viscosity decreases with stress over time |
| Rheopectic | Viscosity increases with stress over time |
| Shear thinning | Viscosity decreases with increased stress |
| Dilatant or shear thickening | Viscosity increases with increased stress |
What is pseudoplastic and dilatant?
An example of dilatant fluid is sand in water. On the other hand, when viscosity decreases when stress increases, the fluid is called pseudoplastic fluid.
What is the difference between plastic and pseudoplastic?
Difference between the plastic and pseudoplastic. The plastic gives velocity decreases as shearing rates increases. The psedoplastic gives velocity decreases with an increase shear thinning.
What is the difference between thixotropic and pseudoplastic?
The key difference between thixotropic and pseudoplastic is that the viscosity of thixotropic fluids decreases upon applying a force, whereas the viscosity of pseudoplastic fluids increases upon applying a force. Some common examples of pseudoplastic fluids include ketchup, paint, cornstarch in water suspension, etc.
What is Newtonian and non Newtonian flow?
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 is dilatant material?
A dilatant (/daɪˈleɪtənt/, /dɪ-/) (also termed shear thickening) material is one in which viscosity increases with the rate of shear strain. Such a shear thickening fluid, also known by the initialism STF, is an example of a non-Newtonian fluid.