ShearthinningVerläufe

ShearthinningVerläufe, also known as shear thinning flows, are a type of non-Newtonian fluid behavior where the viscosity of the fluid decreases with increasing shear rate or shear stress. This phenomenon is commonly observed in various industrial and natural processes, including the flow of polymers, paints, and biological fluids like blood. The term "shear thinning" originates from the observation that these fluids thin out or become less viscous when subjected to shear forces, such as those experienced during flow.

The rheological behavior of shear thinning fluids can be described using various models, with the most common being the power-law model. This model expresses the relationship between shear stress (τ) and shear rate (γ̇) as τ = K * γ̇^n, where K is the consistency index and n is the flow behavior index. For shear thinning fluids, the value of n is less than 1, indicating that the viscosity decreases as the shear rate increases.

Shear thinning flows are crucial in numerous applications. In the manufacturing industry, understanding and controlling shear thinning behavior is essential for optimizing processes such as extrusion, coating, and printing. In the biomedical field, the shear thinning properties of blood play a significant role in its flow through capillaries and arteries, ensuring efficient transport of nutrients and waste products.

The study of shear thinning flows involves experimental techniques such as rheometry, where the fluid's response to applied shear stresses is measured, and theoretical models that describe the underlying mechanisms. Advances in computational fluid dynamics (CFD) have also enabled the simulation of shear thinning flows, providing insights into complex flow phenomena and aiding in the design of efficient industrial processes.