WVM Mixers0 pages

Kenics® WVM Static Mixers
for the Water Industry
The Kenics Water Vortex Mixer (WVM)
builds on the HEV static mixer to
offer more flexibility for differing flow
conditions and improved additive
injection. Three different WVM designs
are available. These allow the project
design parameters of length and
pressure drop to achieve a certain CoV
within a certain time to be optimized.

Model

Pressure
Loss

Length to
Achieve
Mixture
Quality
(CoV) of 0.05
(5%)

The WVM mixers consist of a
simple wall additive injection point,
a pre-distribution tab immediately
downstream of the injection point and
banks of trapezoidal shaped mixing
elements. The number of banks of
mixing elements varies depending on
the mixture quality required for the
process. The dimensions, angle of
attack and spacing of the trapezoidal
mixing elements varies between the
WVM models A, B and C. The predistribution tab and the injection point
design are the same for all WVM
models.

WVMA

Highest

Shortest

WVM Pre-distribution Tab

WVMB

Medium

Medium

WVMC

Lowest

Longest

The pre-distribution tab was visually
modeled and optimized in Chemineer’s
laboratory before being modeled again
using CFM (Computation Fluid Mixing)

CoV = Coefficient of Variation, or ó/x
is the standard deviation of additive
concentrations in any samples divided
by the mean mixed concentration of the
additive, a commonly used and quantifiable
measure of mixture quality.

software. Additives injected at the wall
of the pipe are spread into a horseshoe
shape by the pre-distribution tab.
Use of the pre-distribution tab allows
the simplest of injectors to be used –
either a flanged nozzle or a threaded
boss to which the chemical injection
line can be connected. A proprietary
injection fittings with corporation cock
shut off device can also be fitted to the
wall mounted boss if required.
The pre-distribution tab was shown to
improve quantifiable mixture quality
(CoV) by at least 10% over a wide
range of flow rates compared to the
use of a multihole sparger injector. The
improvement in mixing at low Reynolds
number (velocity 0.1 m/sec) conditions
was the greatest.

Visual modeling of
the dispersion of
red dye into water
using the WVM pre
distribution tab.

Reynolds number 10,000t

Reynolds number 100,000