The simplest and probably most wide

The simplest and probably most widely usedvacuum producer is the ejector (Figure 1).Sometimes called a jet pump, an ejector worksby converting pressure energy of a motive fluid(which may be the same as or different fromthe process fluid) into velocity energy (kineticenergy) as it flows through a relatively smallconverging-diverging nozzle. This loweredpressure of the motive fluid creates suction in amixing chamber, into which the process fluid isdrawn from the vessel being evacuated. Theprocess fluid mixes with and becomesentrained in the motive fluid stream. Thismixed fluid then passes on through aconverging-diverging diffuser, where thevelocity is converted back to pressure energy.The resultant pressure is higher than thesuction pressure of the ejector.