👉 The contacted fluid, also known as the lubricating fluid or boundary fluid, is a thin layer of fluid that forms between two surfaces in relative motion, such as in a lubricated joint or sliding contact. This fluid is typically a mixture of water, oils, and additives, and its primary role is to reduce friction and wear between the surfaces. When surfaces move against each other, the fluid is drawn into the contact zone, forming a thin film that separates the surfaces, preventing direct metal-to-metal contact and minimizing energy loss due to friction. This fluid also helps dissipate heat generated during motion and can carry away contaminants, contributing to the overall efficiency and longevity of mechanical systems.
