# How does a steam ejector work?

## How does a steam ejector work?

Steam ejectors pass steam through an expanding nozzle. The nozzle controls the expansion of steam and converts pressure into velocity; thus, creating a vacuum to transfer gases. An ejector operates on a mass basis, not by displacing volume.

## How do you calculate ejector efficiency?

They defined the ejector efficiency as the actual amount of work recovered by the ejector, calculated as the power to compress the suction stream isentropically from suction inlet to diffuser outlet pressure, divided by the theoretical maximum amount that could be recovered by an isentropic expansion of the motive …

What is ejector capacity?

The capacity (#/Hr.) of an ejector handling other than saturated vapor is a function of the fluids molecular weight and temperature. The higher the molecular weight of a fluid, the greater the ejector suction capacity, assuming equal motivating quantities.

How vacuum is created in ejector?

In an ejector, a working fluid (liquid or gaseous) flows through a jet nozzle into a tube that first narrows and then expands in cross-sectional area. The fluid leaving the jet is flowing at a high velocity which due to Bernoulli’s principle results in it having low pressure, thus generating a vacuum.

### How does steam create vacuum?

When matter turns from its gas phase back into its liquid phase, the molecules take up much less space and exert far less pressure. In fact, the condensing steam creates a partial vacuum—a region of much lower pressure than that of the surrounding atmosphere—inside the bottle.

### Where in the ejector profile the velocity of steam is maximum?

Venturi throat
Potential energy is converted to kinetic energy; thus, velocity increases and pressure decreases. The mixture reaches its maximum velocity and lowest pressure at the Venturi throat (Fig. 2).

What is the efficiency of ejector?

(2012) analyzed the efficiencies of an air-air and a steam-steam ejector and found that the properties of working fluid affect the ejector efficiencies significantly; within the compression ratio from 1 to 1.5, the exergetic efficiency of steam-steam ejector varies from 5% to 40%, while the exergetic efficiency of air- …

Which nozzle is used in ejector condenser?

The injection water in rushing into the condenser through the conoidal nozzle, attains a velocity proportional to the vacuum, and this velocity, which the jet of water retains, is found sufficient to enable it to discharge itself through the induction tube C, which is so formed, that its area increases inversely with …