Understanding Eductors


Eductors mainly operate with the help of pressure energy which is found within the high pressure motives liquid to the pump, compress or entrain the secondary fluid of low pressure. How the educator works is quite straight forward and could be summarised as below:

  1. High pressure fluid passes through the specifically shaped nozzle that helps in increasing the velocity of fluid and decreases the pressure of fluid. By passing motive fluid across the nozzle, the energy of static pressure within that fluid converts into the kinetic energy that helps in increasing the velocity of fluid and also reduces static pressure.

The process if called venture effect.

  1. As high velocity streaming exists the orifice nozzle, at the maximum velocity point, vena contracta, the area for low pressure generates. This area of low pressure is almost equal to or maybe less than secondary low pressure fluids, suction fluid thereby permitting it to easily enter educator body.

  1. Since 2 fluids collide the energy gets transferred and suction fluid gets entertained into motive fluid. The 2 fluid streams pass through parallel throat section where the further mixing as well as transfer of energy happens.

  1. This mixture of fluid passes through diffuser section. This by gradually rising in terms of the diameter reduces the velocity of the fluid and thus converts kinetic energy into the static pressure and thus recovery of pressure happens.

  1. An educator is usually considered to be an inefficient device, which recovers approximately maximum of about 40% pressure drop between suction inlets and motive inlets. But its simplicity, a lack of the moving parts as well as the other advantages over the alternate technologies makes them best for a number of applications.


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