||Home >> Mixing
Guide >> Static
Mixing Guide >> Blending
Fluid Blending covers a wide range of application
areas, from gas mixing and turbulent liquid blending to laminar blending
Laminar Fluid Blending relies on the build up of layers or striations
of fluid, by a combination of a splitting, and rotating action of the mixing
The thickness of the striations, d, can be defined as shown following: -
where D is the inside diameter of the pipe, and N is the number of elements.
Turbulent flow conditions increase the intensity of radial mixing in a
static mixer, allowing much shorter mixing lengths. Turbulent flow in an empty
pipe occurs at a Reynolds number of approximately 2000, however in a static
mixer, turbulence will develop at a much lower Reynolds number due to the
increased velocities caused by the elements. Turbulence will develop at a
Reynolds number of 1000.
Radial mixing ....
- Creates both Macro-scale and Micro-scale turbulence with total stream
inversion.Eliminates radial gradients of fluid properties such as concentration,
temperature, density and velocity.
- Creates a residence time distribution which more closely approaches true
plug flow when compared with empty pipes or agitated tanks.