👉 The grad-fluid, also known as the gradient fluid or shear-thinning fluid, is a type of non-Newtonian fluid whose viscosity changes in response to applied shear stress or shear rate. Unlike Newtonian fluids, which maintain a constant viscosity regardless of the applied force, grad-fluids exhibit a decrease in viscosity as the shear rate increases. This means that when subjected to higher shear forces, such as those found in fluid flow or mechanical deformation, the fluid becomes less viscous and flows more easily. This behavior is often observed in materials like ketchup, paint, and blood, where the fluid's resistance to flow decreases under stress, making it easier to apply or spread. The grad-fluid model is crucial in understanding and predicting the flow behavior of such materials under various conditions.
