Spray nozzles

Fluid mixing and agitation

In many process lines where tanks of chemicals are used it is necessary to keep the fluid in the tank in motion to avoid separation and sedimentation. Fluids can be recirculated through the tank to achieve this but the recirculation process can greatly enhanced by the introduction of eductor nozzles.

The fluid is recirculated through the eductor but due to the shape of the nozzle as the fluid is ejected it creates a pressure drop which serves to suck in the surrounding fluid (the venturi principle). This means that 5 times the volume of pumped fluid is set in motion in the tank.

How eductors work

The eductor is submerged inside the tank. Motive liquid is pumped under pressure through the discharge orifice. The jet of motive liquid enters the venturi section, entraining additional liquid from the tank and moving it through the venturi. A discharge plume of combined motive and entrained liquid exits the venturi and continues the mixing and agitating action for a substantial distance. The operation of the eductor creates a multiplying effect on fluid flow. Depending of the model and the operating pressure, the volume of liquid discharged from the eductor will be 4 - 5 times greater than the volume of motive fluid pumped. This highly efficient operation reduces energy use and saves you money.

Using eductors will reduce settling of suspended solids, improve circulation, maintain uniform
liquid characteristics, mix chemicals, or move solids along the bottom of a tank. Eductors offer a light weight, inexpensive alternative to mechanical mixing methods.


Eductors may be employed effectively in tanks used for plating, phosphating, sludge, paint, anodizing, agricultural fertilizers and chemicals, pulp, slurries, electrocoating and pretreatment. TurboMixTM nozzles are commonly used in open tank heating applications. Heating is accomplished by introducing steam into the an open tank through the submerged eductor Some common applications for open tank heating are cooking grain, cooking mash, cooking starch, heating, as well as circulating and mixing.

We supply two ranges of edcutor systems. For eductors in metals (brass, cast iron and stainless) we supply the Turbomix system from Bete for plastic eductors in PP or PVDF we supply the Uni Eductor from Uni-Spray which is part of their quick fit system for pre-treatment spray lines.

Please access the data sheet by clicking on the icon below

Turbomix eductor mixing nozzle Uni Eductor


Fluid Agitation Engineering Considerations