Cazuela de Vaca (Beef and Pumpkin Stew) This hearty Chilean stew of beef, corn, and pumpkin is a one dish meal. The main ingredients are stewed in serving-sized pieces, so that each person receives a large piece surrounded by a broth with the other vegetables.
Quick Answer. A rotary vane vacuum pump works by using centrifugal force to turn blades against the circular surface of a cylinder whereby pockets of air are pushed from an inlet port to an outlet port as air pressure increases.
How to determine pump rotation by impeller design. Impellers must turn in a direction so that the fluid is pushed (not. scooped) through the pump (see sample drawing below). Exceptions. are pumps with straight vane impellers (vanes perpendicular to the. shaft) and shrouded impellers. Straight vane impellers function in. either direction.