What is the definition of pseudoplastic liquid?

A pseudoplastic fluid is one whose viscosity decreases as the shear rate in the pump increases.

What is pseudoplastic and dilatant?

These are fluids in which the viscosity does not depend on fluid shear stress rate history. 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. An example of pseudoplastic fluid is blood.

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. Fluids are liquid or gaseous substances that have a viscosity. Both these are non-Newtonian fluids.

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 is the reciprocal of viscosity?

The reciprocal of the viscosity is called the fluidity, a measure of the ease of flow.

What is the law of viscosity?

1. NEWTON’S LAW OF VISCOSITY Newton’s law of viscosity states that “shear stress is directly proportional to velocity gradient”. The shear stress between the two adjacent layers of fluid is directly proportional to the negative value of the velocity gradient between the same two adjacent fluid layers.

Is blood pseudoplastic or Bingham plastic?

Blood is considered as Bingham plastic fluid. The analytical results such as pressure drop, resistance to flow and wall shear stress have been obtained. Effect of yield stress and shape of stenosis on resistance to flow and wall shear stress have been discussed through tables and graphically.

What is the difference between plastic and pseudoplastic flow?

So if any liquid exhibits plastic flow and lacks its yield point then it is believed to exhibit Newtonian flow. If any liquid exhibits non-Newtonian flow then it is exhibiting Pseudoplastic flow. This is generally observed in liquids that have a much decreased viscosity under the effect of shear strain.

Why is blood thixotropic?

Blood is a non-newtonian fluid with visco-elastic, shear thinning and thixotropic properties. A thixotropic fluid is a fluid whose viscosity is a function not only of the shearing stress, but also of the previous history of motion within the fluid [1].

What is rheology behavior?

Rheological behavior determines the metal flow into die cavities during forming process. The SSM slurries with solid fraction of 0.5 exhibit two unique rheological properties, that is, thixotropy and pseudo plasticity. “Thixotropy” describes the time dependence of transient state viscosity at a given shear rate.

What is rheology and its types?

Rheology is the science of the deformation and flow of matter, and hence it is concerned with the relationships between stress, strain, rate of strain and time. Types of flow curves. τ = η ⋅ γ ˙ and the single constant η (called the coefficient of viscosity) is sufficient to fully describe the flow behaviour.

How does the viscosity of a pseudoplastic fluid change?

Thixotropy. Some non-Newtonian pseudoplastic fluids show a time-dependent change in viscosity; the longer the fluid undergoes shear stress, the lower its viscosity. A thixotropic fluid is a fluid which takes a finite time to attain equilibrium viscosity when introduced to a steep change in shear rate.

How are pseudo plastic fluids related to shear rate?

Pseudo-plastic fluids are also referred to as shear-thinning fluids. The viscosity of these fluids will decrease with increasing shear rate. Therefore, for these fluids, the exponent Eq. 9.4 is n < 1.

What can you use pseudoplastic thinning fluid for?

In pseudoplastic or shear thinning fluid, the apparent viscosity decreases with increased stress. Applications: Jungbunzlauer offers a smooth flow xanthan gum, which can heighten viscosity in foundation applications, but also provide a pseudoplastic rheology profile when poured, pumped, or sprayed.

How is viscosity of plastic related to shear stress?

Notice that the viscosity of a plastic decreases at higher shear stress. Typical examples are many plastics, or more interestingly, rocks and ice. Pseudoplastic: Pseudoplastics exhibit behaviors both of Newtonian flow and plastic flow.