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KSB Centrifugal Pump Lexicon –

From A to Z

Hub diffuser

On tubular casing pumps, particularly those of an axial flow type, the flow velocity downstream of the impeller can be reduced by means of a hub diffuser. The free flow cross-section is enlarged by a gradual reduction of the hub diameter.
Hub diffusers are subject to the risk of flow separation both at the inner hub contour and at the cylindrical outer contour (see Flow separation).


  

  

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