What method involves trapping a liquid between lobes, vanes or gears?

The method of trapping a liquid between lobes, vanes, or gears is characteristic of a rotary pump. This type of pump utilizes rotating elements to create pressure and move the fluid through the system. When the lobes, vanes, or gears rotate, they create a series of sealed chambers that trap and transport the liquid from the inlet to the outlet. This process is efficient for handling various liquids, including those that are viscous or have particulates, making rotary pumps popular in many industrial applications.

Centrifugal pumps, on the other hand, use a rotating impeller to impart velocity to the liquid, converting this velocity into pressure as water is flung outward. Reciprocating pumps operate by creating a vacuum to draw in liquid and then using a piston or diaphragm to push it out, relying on linear motion rather than rotation. Dynamic pumps are a broader category that includes centrifugal pumps, focusing on energy transfer through the motion of the fluid itself rather than trapping it within chambers.