What is pseudoplastic flow?
In contrast to a Bingham fluid, a pseudoplastic fluid is a fluid that increases viscosity as force is applied. A typical example is a suspension of cornstarch in water with a concentration of one to one. This cornstarch behaves like water when no force is applied; however, it is solidified as force is applied.
What is pseudoplastic flow in rheology?
Pseudoplastic: Pseudoplastics exhibit behaviors both of Newtonian flow and plastic flow. The liquid flows as a plastic at high shear rates, but does not have a yield point and so will always flow under a shear stress, like a Newtonian liquid.
What is an example of a pseudoplastic fluid?
An example of pseudoplastic fluid is blood. This application is highly favored within the body, as it allows the viscosity of blood to decrease with increased shear strain rate . Newtonian fluid is a special case of the non-Newtonian time-independent fluid where the viscosity is constant.
What is Ostwald de Waele equation?
Under these assumptions and the usual boundary layer approximations, the velocity and the temperature fields of the non-Newtonian Ostwald–de Waele fluid are governed by the following equations of mass, momentum, and energy:(10) ∂ u ∂ x + ∂ v ∂ y = 0 , (11) ∂ u ∂ t + u ∂ u ∂ x + v ∂ u ∂ y = ∂ ∂ y 1 ρ ∞ τ xy – σ B 0 2 ( …
Is pseudoplastic a Newtonian?
Dilatant and pseudoplastic fluids are both non-Newtonian fluids in which the relationship between viscosity and shear rate is not time dependent.
What is plastic flow and pseudoplastic flow?
The key difference between plastic and pseudoplastic flow is that plastic flow describes the flowing behavior of a material after the application of stress, whereas pseudoplastic flow exhibits the behavior of both Newtonian flow and plastic flow.
What are pseudoplastic materials?
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 are pseudoplastic fluids dilatant fluids and Bingham fluids?
– Fluids That Decrease in Viscosity When Force Is Applied – Substances that decreases in viscosity when force is applied to them are called pseudoplastic fluids. Before force is applied, these substances have a high viscosity, appearing at a glance to be Bingham fluids, but they do not have a yield value.
What is Bingham plastic model?
The Bingham plastic model is the most common rheological model used in the drilling industry. This model is a two parameter model that includes yield stress and plastic viscosity of the fluid. As it is shown in Figure 2-15, the fluid initially resists flowing until the shear stress exceeds a certain value.
What is Herschel Bulkley model?
The Herschel–Bulkley model can be used to describe the rheological behaviour of certain non-Newtonian fluids. When fitting to experimental data, its parameters need to be determined and this is a non-linear problem. The conventional approach is to solve the resulting normal equations numerically.
What is plastic and pseudoplastic?
Summary – Plastic vs Pseudoplastic Flow The key difference between plastic and pseudoplastic flow is that plastic flow describes the flowing behavior of a material after application of stress, whereas pseudoplastic flow exhibits the behavior of both Newtonian flow and plastic flow.