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 Herschel Bulkley model?

The Herschel–Bulkley fluid is a generalized model of a non-Newtonian fluid, in which the strain experienced by the fluid is related to the stress in a complicated, non-linear way. Three parameters characterize this relationship: the consistency k, the flow index n, and the yield shear stress. .

What is thixotropic behavior?

In rheology thixotropic behavior is defined as time-dependent behavior. It means a reduction of the structural strength during a constant shear load phase and a more or less rapid but complete regeneration of the structure during the subsequent rest phase.

What causes thixotropy?

Thixotropy arises because particles or structured solutes require time to organize. Some fluids are anti-thixotropic: constant shear stress for a time causes an increase in viscosity or even solidification. Fluids which exhibit this property are sometimes called rheopectic.

Which among the following statement is the definition of a pseudoplastic liquid?

b) A liquid which becomes more viscous as the rate of shear increases.

What is flow behavior?

It describes the thickness or pumpability of the fluid, and is somewhat analogous to the apparent viscosity. The flow behavior index (n) indicates the degree of non-Newtonian characteristics of the fluid. For drilling fluids, this is a desirable property and most drilling fluids are pseudoplastics.

What are Bingham bodies?

A Bingham plastic is a viscoplastic material that behaves as a rigid body at low stresses but flows as a viscous fluid at high stress. It is named after Eugene C. Bingham who proposed its mathematical form.

What is the thixotropic behavior of suspension?

Suspensions show thixotropic behavior when the suspended phase is capable of forming a structure and the steady state degree of aggregation is a function of the steady state rate of shear.

What is muscle thixotropy?

Thixotropy is the property of some gels to turn into liquids under certain conditions. There is a small degree of stiffness in the normal resting muscle that disappears on voluntary movement or passive muscle stretch. Thixotropy is the physiological term used to describe this component of muscle tone.

How thixotropy is measured?

Thixotropy can be quantitatively measured using a rotational rheometer. The most commonly used testing geometries are 20-40 mm parallel plate or a cup/rotor geometry.

What is the behavioral definition of out-of-seat behavior?

1. What is the behavioral definition of out-of-seat behavior? Out of seat behavior is defined as any time Sara leaves her assigned seat without permission. This does not include times she is permitted to leave her seat; for example, sharpening a pencil, using the restroom, or group work.

What is the meaning of pseudoplastic?

Definition of pseudoplastic 1 : lacking the capacity for major modification or evolutionary differentiation — compare euryplastic, stenoplastic 2 : characterized by or being flow in which the rate of flow (as of solutions of rubber or gelatinous substances) increases faster than normally in relation to the shearing stress

What is pseudoplastic shearing?

Definition of pseudoplastic. 2 : characterized by or being flow in which the rate of flow (as of solutions of rubber or gelatinous substances) increases faster than normally in relation to the shearing stress.

What is an example of Pseudo Plastic fluid?

Typical examples for pseudo-plastic fluids are polymer solutions and similar solutions of high molecular weight substances. At low shear rates, these liquids will experience the formation of shear stress. The shear stress results in the reordering of the molecules in order to reduce the overall stress.