When the properties of these are time-dependent, they are classified as rheopectic or thixotropic, and when they are dependent on the shear stress they are called pseudoplastics or dilatants.
The Palierne equation models a suspension of two types of these. The Herschel-Bulkley model describes these when there is a non-linear stress/strain relation, and, when initial flow of these requires a finite yield stress, they are called Bingham plastics. The combined study of these and of plastics is known as rheology. When the properties of these are time-dependent, they are classified as rheopectic or thixotropic, and when they are dependent on the shear stress they are called pseudoplastics or dilatants. When considering these, the numerator in the Prandtl number and the denominator in the Grashof number are no longer constants. For 10 points, identify these types of fluids, the most famous example being a suspension of starch in water that can be walked across, that are defined by their lack of a consistent viscosity.
The Palierne equation models a suspension of two types of these.
non-Newtonian fluid