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.
The energy changes occur by virtue of two main parts of the pump, the impeller. and the volute or diffuser. The impeller is the rotating part that converts driver energy into. the kinetic energy. The volute or diffuser is the stationary part that converts the kinetic. energy into pressure energy.