What happens inside a static mixer?
If you think using just a venturi/injector is good enough, think again. Venturi injectors do attain fairly good mass transfer, but using a static mixer can greatly improve your mass transfer efficiency. See the image below.
Close-up of Static Mixer Bubble Shearing Action!
(picture taken at 1 millisecond exposure time)
What is a static mixer?
Static mixers are a series of geometric mixing elements fixed within a pipe, which use the energy of the flow stream to create mixing between two or more fluids or gases.
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Notice how the bubbles are sheared into much smaller bubbles as they move from left to right resulting in significantly greater ozone mass transfer than using a venturi alone. Pipe size is 1-1/2" diameter.
Static Mixer Facts!
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Static mixers will improve ozone mass transfer efficiency vs. using an injector alone |
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Target Water velocity is 5-10 ft/sec: low water velocity through the mixer results in poor bubble shearing; high water velocity results in higher pressure drop and does not significantly improve mass transfer efficiency |
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Static mixers do not require any maintenance -no moving parts! |
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Must be installed within 12-in prior to a contact tank |
Determining Velocity in a Static Mixer
V = (Q x 0.402)/D^2
[V = Q times 0.402 divided by the Diameter squared]
Q is flowrate in gallons per minute (GPM)
D is diameter in inches
V is the velocity in feet per minute (FPM)
For the MX-Series, optimum water velocity through the static mixer must be between 5-10 feet/second.
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