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.
An impeller with a high number of vanes reduces the amplitude of the pressure pulses that are caused as the impeller tip passes by the cutwater. In certain applications these pressure pulses are undesirable such as a paper machine headbox pump which typically will be a double suction type with 8 or more vanes.