Viskozite ile kayma hızı arasında yakın bir ilişki vardır, which is the rate at which a liquid deforms under shear force.

Shear rate is a physical quantity that describes the deformation rate of a liquid. It represents the deformation velocity per unit time. It is the ratio between the Shear velocity and the geometric constraint on the liquid. The shear rate is usually expressed as the ratio of the displacement difference per unit time (shear velocity) to the distance between two parallel layers (shear distance). The unit is usually the reciprocal of the second (s^(-1)).

Viscosity is the internal viscous resistance of a liquid, which measures the degree of stickiness or fluidity of a liquid. The greater the viscosity, the stickier the liquid and the more difficult it is to flow. Viscosity is usually expressed as the ratio of force per unit area to the difference in velocity per unit time (kesme hızı). The unit is usually PASCAL seconds (Pa.s) or millipascal seconds (mPa·s).

Viskozite ve kayma hızı

The relationship between viscosity and shear rate can be described by Newton’s laws of fluid. A Newtonian fluid is an idealized fluid with a constant viscosity that is independent of the shear rate. According to Newtonian fluid laws, viscosity is equal to the ratio of stress to shear rate.

In Newtonian fluids, changes in the shear rate do not affect the magnitude of the viscosity, whether the shear rate is small or large. The viscosity of a Newton fluid remains the same, no matter how fast or how it is cut. Fakat, for non-Newtonian fluids, such as shear-thinning and shear-thickening fluids, kesme hızı değiştikçe viskozite değişecektir. Bu, Newtonyen olmayan bir sıvının viskozitesinin kayma hızının bir fonksiyonu olduğu anlamına gelir, kesme hızı arttıkça artabilir veya azalabilir. Newtonyen olmayan akışkanların viskozitesi ve kayma hızı arasındaki ilişki, reolojik testler ve uygun reolojik modeller ile tanımlanabilir ve tahmin edilebilir..