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How
to Size your JDMIX Static Mixer
for turbulent flow
Sizing a typical JDMIX motionless mixer for water like applications is very simple. The formulas listed below for Reynolds number and velocity will enable you to determine just how many mixing elements are necessary for your application.
1) Calculate the Reynolds number for your application to make sure you are in turbulent flow
Re = 3157QS/uD
| Q | = | flow rate in gallons per minute | |
| S | = | Specific Gravity | |
| u | = | Viscosity | |
| D | = | Inside diameter of your pipeline in inches |
Example: 100 gpm of water flowing in a 3 inch carbon steel pipeline
| Q | = | 100 gpm | |
| S | = | 1.0 | |
| u | = | 1.0 | |
| D | = | 3.068 |
Reynolds Number = 102,900
2) Calculate the velocity for your application in fps
V = .408Q/d2 = fps
| Q | = | flow rate in gallons per minute | |
| d | = | Inside diameter of your pipeline in inches |
Example: 100 gpm of water flowing in a 3 inch carbon steel pipeline
| Q | = | 100 gpm | |
| d | = | 3.068 |
Velocity = 4.33 fps
If you are in turbulent flow, the number of mixing elements necessary for 100% homogeneous mixing is as follows:
| Velocity Range | Number of Mixing Elements Required | ||
| 0 - 1 fps | 6 elements | ||
| 1 - 3 fps | 5 elements | ||
| 3 - 4 fps | 4 elements | ||
| 4 - 7 fps | 3 elements | ||
| 8 - 10 fps | 2 elements |
For the example above, going 4.3 fps in a 3 inch diameter pipeline, you need three mixing elements for a 100% homogeneous mix.
Please note to double check your summary with your local JDMIX, Inc representative.
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