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| Ultra Mixer |
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Ultra Mixer Technology
Ultra mixer technology covers the initial distribution needs, but as we move down towards the exit of the mixing system we must focus our attention on good dispersion.
We do this by changing the scale of the mixing structure from one that is distributive to one that is dispersive.
This is achieved with what we call the "U" type Ultra Mixer. The basic mixing elements of this static mixer can be changed from a coarse to a fine scale of structure to concentrate initially on distribution and finally on dispersion of the additive. |
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VISCOSITY AND PRESSURE DROP CONSIDERATIONS
Most polymeric materials are shear sensitive. That is to say, their viscosity is dependent on the shear rate to which they are exposed. Usually an increased shear rate produces a lowering of viscosity and is referred to as shear thinning.
Viscosity versus shear rate data is usually provided by the polymer manufacturer in the form of a graph on log/log paper. We list below the shear rate and pressure drop formula for each of the devices we have described and others together with the units involved.
Main pipe inside diameter = D inches
Main product flow rate = Q gpm
Shear rate = g sec-1
Viscosity = m cP
Pressure drop = dP psi
Axial length = L inches
Additive fraction = F
Number of mixing elements = n |
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| Device |
A/t Value |
Shear rate |
Pressure drop |
Comments |
| Open pipe |
---------- |
39.2Q/D3 |
22.73x10-6Qm L/D4 |
Hagen-Poiseuille Equation |
| Helix |
np |
96.0Q/D3 |
205x10-6Qm n/D3 |
Helix L/D ratio = 1.5:1 |
KOMAX SYSTEMS, INC.
INTRODUCES
A NEW STATIC MIXER SYSTEM
FOR HIGH VISCOSITY PRODUCTS
(U.S. Patent 5,484,203)
A Single Injection Point allows pressurized clearing action from the additive pump if needed. The built in check valve prevents back flow of polymer into the additive supply.
The PARAFLO Injector distributes additive across the inlet of the ULTRA mixer. It is less than one pipe diameter in length and has a low pressure drop.
The ULTRA Mixer generates multiple interstices with a uniform spatial distribution to give 100% utilization of the mixer volume and superior additive dispersion with low pressure drop.
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| Device |
A/t Value |
Shear rate |
Pressure drop |
Comments |
| L/H unit |
8/p2 F |
215Q/D3 |
5.9x10-4Qm /D3 |
Each hole dia. = 0.45D |
| H/L unit |
3.6/F |
81.7Q/Dt2 |
22.1Qm L/Dt3 |
Where annulus dia.= 2D/3 |
| SIDD |
288/p2 F |
593Q/D3 |
12.6x10-4 Qm /D3 |
Each hole dia. = 0.3D |
| PARAFLO |
8pN/F |
Contact factory for shear rate and pressure drop calculations |
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