Page 332 - Applied Process Design for Chemical and Petrochemical Plants Volume I

Mixing of Liquids 303

Figure 5-14. Reynolds number correlation for propellers. By permission, Rushton, J. H. et a!. [la].

100

50

I

Figure 5-65. Reynolds number correlation for a flat blade turbine. By permission, Rushton, d. H. et a\. [I 81.

This is dependent on the impeller type, speed, diame- Torque, 'c = [N,p N'13 Q513] / (NQ513 (2~)) (5-30)
ter, and the geometry of the installation.
Flow per power input:
Torque; ?,% = N, ( pN'D') /2X (5-27)

Lateral fluid forces on mixer; F = NFP N'DI (5-28) Q/P = [%I/ (N413Q213p) (5 - 31)

For two different impellers, comparing performance of
power, flow and flow per power at constant flow and speed
[29] in terms of flow, Q, at speed, N: Power, input, net to impeller shaft:

1
Fluid forces, F = [ITF (p N213Q413) /NQ413 (5-29) P = (N,/NQ5I3) (p N413Q513) (5-32)