eductor
An eductor, also known as an ejector or ejector pump, is a device that uses a high-velocity jet of motive fluid to entrain and transport a second fluid, creating flow without movable mechanical parts. Eductors are widely used to generate vacuum, transfer liquids, or mix chemicals in a simple, compact form.
Principle: The motive fluid passes through a converging-diverging nozzle, increasing velocity and reducing static pressure in
Construction: A typical eductor has a motive-fluid inlet, a nozzle, a mixing chamber, an entrainment inlet, and
Performance and considerations: The entrainment ratio ER is the mass flow of entrained fluid divided by the
Applications: used for vacuum generation in tanks and process lines, liquid transfer and drainage, chemical mixing,
Advantages and limitations: advantages include simplicity, ruggedness, and lack of moving parts; availability of motive fluid;