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Impeller: PBT



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pbtdown.jpg (27657 bytes)

Images courtesy of P. Csiszar

The PBT is a generic impeller design. It is a 4-bladed turbine with 45o pitched blades. Blade width is 0.2 times its swept diameter. The PBT has long been considered an axial flow impeller. That really depends on its D/T. For small D/T, the PBT is an axial flow impeller. For very large D/T, the PBT is almost a radial flow impeller. A 3-bladed PBT with 30o pitched blades is almost as axial as a hydrofoil. In Europe, the 6-bladed version of the PBT is more common.

Np=1.27, Flow Number Nq=0.79

Re Np Nq Theta N Discharge angle Notes
1       90 deg

T = 17.5"

Z = 12.0",     Z/T = 0.69

D = 6.0",      D/T = 0.34

OB = 3.0",    OB/D = 0.5

4 baffles

Fluids:  96% Glycerine and Carbopol

10     10000 90
30     1300 80
100     400 75
300     65 50
1000     17 45
3000       45
10000       45
turbulent 1.26 0.79   45

Reference  The data above was extrapolated from graphs in the reference.

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