👉 A companion fluid is a substance that interacts closely with another fluid, often enhancing or modifying its properties, such as viscosity, surface tension, or chemical reactivity. In various applications, including lubrication, coating, and material science, companion fluids are used to tailor the behavior of the primary fluid to meet specific performance requirements. For example, in hydraulic systems, a companion fluid might be added to improve lubrication and reduce wear, while in coatings, it could help achieve a uniform film thickness or enhance adhesion. The interaction between the fluids can be finely tuned to optimize the overall system's efficiency and functionality.
