epäNewtoniaaliset

epäNewtoniaaliset refers to fluids that do not adhere to Newton's law of viscosity. This law states that a fluid's viscosity remains constant regardless of the stress applied to it. In contrast, the viscosity of epäNewtoniaaliset fluids changes based on the applied shear stress or shear rate. This behavior means their flow properties are not predictable by simple linear relationships.

There are several types of epäNewtoniaaliset fluids. Shear-thinning fluids, for instance, become less viscous when agitated or stirred. Examples include ketchup, paint, and blood. As stress is removed, their viscosity returns to its original state. Shear-thickening fluids, on the other hand, become more viscous when subjected to stress. Cornstarch mixed with water, often used in science demonstrations, is a common example of a shear-thickening fluid. It can be poured like a liquid but solidifies if punched or squeezed rapidly.

Other categories include Bingham plastics, which behave like a solid until a certain yield stress is reached, after which they flow like a viscous fluid. Toothpaste and mayonnaise are often cited as examples. Thixotropic fluids are time-dependent shear-thinning fluids, meaning their viscosity decreases over time under constant shear stress. Rheopectic fluids are the opposite, their viscosity increasing over time under constant shear stress. Understanding the behavior of epäNewtoniaaliset fluids is crucial in various fields, including chemical engineering, food science, and materials science, for designing processes and predicting material performance.