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Impeller: PBT |
Images courtesy of P. Csiszar
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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
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| Re |
Np |
Nq |
Theta N |
Discharge angle |
Notes |
| 1 |
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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
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| 10 |
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10000 |
90 |
| 30 |
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1300 |
80 |
| 100 |
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400 |
75 |
| 300 |
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65 |
50 |
| 1000 |
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17 |
45 |
| 3000 |
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45 |
| 10000 |
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45 |
| turbulent |
1.26 |
0.79 |
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45 |
Reference The data above was extrapolated from
graphs in the reference.
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