Rotary vane pumps are a type of positive displacement pump that uses rotating vanes to move fluids. These vanes slide in and out of a rotor, creating a series of chambers that trap and transport the fluid. They are commonly used in applications requiring consistent flow rates, such as in automotive and industrial systems. These pumps can handle various fluids, including oils and gases, making them versatile. Their design allows for efficient operation at different pressures, and they are known for their durability and low maintenance needs. Positive displacement pumps and fluid dynamics are key concepts related to their function.