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Flow Patterns
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Definitions

This nomenclature is used at Post Mixing to describe flow patterns under turbulent conditions.

U = axial up flow or up-pumping or up draft.  This is up the shaft and down the walls.
D = axial down flow or down-pumping or down draft.  This is down the shaft and up the walls.
R = radial flow.  This is a cylindrical jet spreading out from the impeller.  Some of it goes up the wall and some of it goes down the walls.
1 = extreme radial.  The flow is perpendicular to the shaft (tank axis)
3 = extreme axial.  The flow is generated by a hydrofoil of fluidfoil and is very axial
2 = mixed flow direction.  The flow has components of both axial and radial flows.

The determination of Proximity Factors requires knowledge of the flow or pumping direction of the impellers.

Examples

D2:  Predominately axial down flow but has radial components.  The flow pattern spreads out below the impeller.  Pitched bladed turbine: 
PBT, P4, A200
D3:  Highly axial flow pattern.  Hydrofoils, fluidfoils, and propellers: 
PR-D, AP-3, , HE-3, A100, A110, A310, A312, A320, A315, A6000
R1:  Highly radial flow pattern. Turbines with disks:
RT, D-6, R100, RD, Holmes & Narver, R300, R320, RS6, CD-6, R130, Smith Turbine, RDC, BT-6, Bar Turbine, R510, Sawtooth, Disperser, R500
R2:  Predominately radial flow pattern but has axial components.  Turbines and paddles without a disk.
RP, R200
U2:  Predominately axial up flow but has radial components.
PBT-U
U3:  Highly axial up-flow pattern. Up-pumpers:
PR-U, A340, A345
 

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Last modified: Feb 6, 2005