For a given process condition, the effectiveness of an agitator to create or accelerate a process change is determined by its geometry, i.e., the impeller design.
Older technology was focussed on ensuring sufficient flow was created to achieve process change without considering energy consumption. Modern technology strives to achieve a combination of effective flow and low energy consumption.
An agitator impeller is defined by its Power Number (Np) and its primary Pumping Number (Nq). RTF4 has the highest pumping number to power number ratio among other hydrofoil agitators in the market.
This is achieved by transferring all available energy to the impeller into pure axial flow without turbulence at the impeller zone, resulting in thorough yet gentle mixing in a short period of time with minimum energy consumption. With that, RTF4 can offer significant process and product improvements.
| Increasing width | Blades are slim at the tip where the speed is greatest and wide at the base where the speed is lowest. This gives a more uniform discharge velocity along the blade length, producing the most efficient pumping action |
| Profiled edge | Both the leading and the trailing edges are profiled to minimise turbulence. This has the added benefit of reducing erosion caused by particle/blade collisions. |
| Blade twist | Starting with a pronounced twist at the base, the blade gradually decreases its angle of attack towards the tip. This creates an even velocity profile while keeping the turbulence behind the impeller to a minimum. |
| The Arch | The blade arc is calculated to slice through the liquid at a shallow angle with the leading edge, while the sharply-cambered trailing edge directs powerful currents downwards |
RTF4 impeller is available in mild and stainless steel and various specialty coatings to provide abrasion or chemical resistance. Wet ends are polished to 180 grit for use in sanitary applications.
When the scope of agitation involves dispersion of moderate to high viscosity liquids, dispersion of solids into liquids, dissolving/hydrating powders, maintaining homogeneity of a solid/liquid mix, or any other difficult mixing application, creating shear while mixing is essential.
High speed saw-toothed dispersers are utilised effectively for particle size reduction, or for long residence time dispersions.
Though, where high shear rates are required (given that it is not detrimental to the product or the process), fixed stator/rotor high shear mixers are commonly employed.
Rotosolver® provides the most innovative technology for producing superior liquid and solid/liquid dispersions and dissolving powders for 100% utilisation. This high shear mixing technology optimises the balance between shear rates, particle size reduction, and flow/circulation within the mixing tank.
See how the Rotosolver® compares to other high shear mixers.
Flow is drawn into the mixing head from above and below, where all materials are immediately mechanically sheared by the teeth on the rotors at the top and the bottom of the cylinder.
The two high velocity counter current streams converge within the cylinder, causing high turbulence and hydrodynamic shear without momentum loss from obstructions within the cylinder.
Pressure forces materials to the periphery of the cylinder, where it is subjected to further mechanical shear as material passes through the sharpened slots. The high velocity radial charge combines with slower moving tank flow for additional hydrodynamic shear and circulation.
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