Flow profiles of impellers

What is a flow profile?

Agitators generate movement through rotation. The particles of the stirring substances are transported in a certain way and move in patterns through the container. These patterns are generated, not exclusively, but mainly, by the shape, structure, number and size of the impellers. These flow patterns of the impellers are called flow profiles.

There are generally three different flow profiles: axial, radial and tangential.

Axially conveying impellers:

Axially conveying impellers move the mix first towards the bottom, from where it is conveyed outwards in the direction of the container wall, upwards along the wall to the surface and then inwards again towards the agitator shaft and impeller.

Examples: hollow body impeller, propellers, pitch blade turbine, helical ribbon impeller

Radially conveying impellers:

Radially conveying impellers move the mix in the direction of the container wall. There the mix is ​​divided into two directions, i.e. up and down. The current is then deflected inwards from the bottom and the surface and again reaches the axis of rotation with the agitator shaft and impeller.

Examples: disc stirrers, blade stirrers, turbine stirrers

Tangentially conveying impellers:

Tangentially conveying impellers generate a movement around the impeller. In the case of axially or radially conveying impellers, tangential conveyance always plays a role.

Examples: anchor stirrer, blade stirrer

Combinations of axial and radial conveying directions, such as with a cross bar stirrer, are also possible.

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