Rheology Basics and Applications

A type of non-Newtonian flow where materials don't flow until a certain threshold stress (yield value) is reached, after which they flow linearly.

The minimum stress required to initiate flow in a plastic material.

Mathematical equation (τ = f_B + μD) that describes plastic flow by relating shear stress (τ), Bingham yield value (f_B), plastic viscosity (μ) and shear rate (D).

A type of non-Newtonian flow where the apparent viscosity decreases with increasing shear rate; no yield value.

The slope of the rheogram in plastic flow.

The reciprocal of mobility in plastic flow.

Viscosity decreases with increasing shear rate.

The science studying how matter deforms under stress.

A fluid where viscosity is constant regardless of the stress applied.

A fluid with varying viscosity depending on the stress or flow rate.

A measure of a fluid's resistance to flow.

Stress is directly proportional to the rate of shear.

Force per unit area causing deformation in a fluid (N/m2).

The rate at which layers of fluid slide past each other (s^-1).

A non-Newtonian property where viscosity decreases with shear; returns to original viscosity upon rest.

A type of non-Newtonian flow characterized by a yield stress; fluid does not flow until a certain stress is applied.

A type of Non-Newtonian flow where viscosity decreases as shear rate increases.

A type of Non-Newtonian flow where viscosity increases as shear rate increases.

A property of some suspensions where, when agitated, significant resistance to flow is observed, and the material appears to expand or swell. This occurs as the component settling.

A suspension where the particles are not clumped together and the liquid component is able to move easily in between components.

A suspension where particles are clustered or clumped together.

A time-dependent non-Newtonian behavior where viscosity decreases with increasing shear rate, and viscosity increases with decreasing shear rate.

A fluid whose viscosity remains constant regardless of the applied shear rate.

A fluid whose viscosity changes with the applied shear rate.

A non-Newtonian fluid whose viscosity decreases as the shear rate increases.

A graph that shows the relationship between shear stress and shear rate for a fluid.

A loop in a rheogram where the stress-strain curve for a material during unloading does not follow the loading curve, indicating that some structure is lost that doesn't recover immediately.

A phenomenon where the viscosity of a material increases with time when subjected to shear and shear thinning