👉 The Mitchell fluid, also known as Mitchell's fluid or Mitchell's oil, is a synthetic, non-Newtonian fluid developed by Charles Mitchell in the 1950s. It is characterized by its unique viscosity behavior, where the fluid's apparent viscosity changes in response to applied shear stress, becoming less viscous under stress. This property makes it useful in various industrial applications, such as in drilling fluids, where it helps reduce friction and improve flow through wells. The fluid's behavior is attributed to its complex molecular structure, which can form networks or chains under stress, leading to its distinctive rheological properties.