👉 The introductory fluid, also known as the first layer of fluid or primary fluid, is a thin, viscous layer that forms at the interface between two immiscible fluids upon their initial contact. This fluid, often a mixture of the two liquids and sometimes a small amount of surfactant or other additives, acts as a barrier that prevents immediate mixing due to surface tension. It plays a crucial role in stabilizing emulsions and suspensions, allowing the fluids to coexist temporarily before any natural processes like diffusion or gravitational settling might cause them to separate. This initial fluid is essential in various industrial and natural processes, such as oil and water separation, inkjet printing, and biological systems.
