ANCHOR IMPELLER A typical representative of impellers with tangential flow is the anchor which generally consists of two blades arranged parallel to the shaft. These are connected via a cross bar following the contour of the vessel bottom. With a diameter ratio of 0.9 to 0.99, the anchor impeller has a small wall clearance. Its main task is to reduce the thickness of the highly viscous boundary layer adhering to the vessel wall in order to intensify the heat exchange. Finger or frame impellers which are still used occasionally, have properties similar to anchor impellers.

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