Mixing Propellers & Blades
With our expert team in the field of mixing, we provide complete solutions to all of our customers’ mixing problems. Our product range includes standard propellers and blades, ranging in diameter from ¼” to 10″, with four-bladed axial, radial, or particular types of turbines, impellers, and all mixing equipment.
We have been providing services with specific solutions using specially designed propeller blades tailored to the needs and different processes for over 30 years. These unique design propeller blades enhance mixing efficiency, preventing stagnant areas in the product within the vessel.
To benefit from Derya Krom Sanayi’s knowledge and experience in the field of mixing, get in touch with us.
1- Three-Blade Marine Type Impeller
The marine-type impeller, the first axial impeller used in stirred tanks, provides excellent homogenization. This type is recommended for use with a maximum of 5 HP power for optimal results. The maximum recommended impeller diameter for this type is 6″ / 150 mm. General application parameters are as follows: top speed of 1,750 rpm and a total tank volume of 2,000 liters. The permitted viscosity limit is 5,000 cP (used for low or medium-viscosity products), and the minimum Reynolds number (NRe) limit is 200. Marine impellers are used for axial flow when a pumping effect is required. Due to their design, they efficiently move and remove liquid from the impeller surface without causing any cavitation.
2- Hydrofoil Impeller
Hydrofoil blades, which are highly efficient impellers, compete effectively with others in various mixing applications. They are used across the entire range of speeds for heat transfer, blending, and solid suspension tasks. The ideal sizing is determined by selecting a boiler diameter within the scope of 0.4 to 0.6 of the D/T ratio. The NRe limit≈ is 200.
3- Six-Blade Disk Impeller
Initially known as the Rushton Turbine, the impeller type is still used in some specialized applications. Thanks to its design, it generates the necessary shear force to break down emulsions. Its application areas include gas-liquid dispersion in small boilers and low gas ratios, liquid-liquid dispersion, and fast chemical reactions. The NRe limit ≈ is 5.
4- Four-Blade Impeller (90 ºC)
These impellers are used to provide mixing during boiler emptying. In practice, they are suitable for low-stability situations. This type of impeller, also known as a flat-blade turbine, generates radial flow. Efficiency can be achieved when the mixing tank has a low volume—the NRe limit ≈ is 20.
5- Sawtooth Mixer
In sawtooth mixers, the primary effect of the impeller is to induce shear rather than mixing. They are commonly used in liquid-liquid emulsions, dense gas-liquid (foam control) dispersion, and solid (powder) – liquid dispersion. This type of mixer is often used with a larger diameter axial impeller, with the sawtooth shaft located in the upper portion to blend the product from the other impeller. The NRe limit ≈ is 10.
6- Six-Blade Concave Propeller
In this type of impeller, six half-pipe-shaped blades are used. Its primary application is gas dispersion, making it suitable for large-volume tanks. It is used in fermenters with high gas flow rates, reaching up to 300-350 tons. Compared to the six-blade disk impeller, the concave impeller enables twice as much gas flow under the same conditions and reduces the liquid rise due to agitation from 50% to 30%.
7- Rotor-Stator Mixer
Rotor-Stator mixers are a type of mixer used for dispersion, emulsification, suspension, and dissolution processes. Within an R&S mixer, a rotating rotor generates strong axial and radial flow. This rotor ensures the proper mixing of solid and liquid components by introducing air into the mixture.
8- Helical Mixer
The helical mixer is a high-viscosity mixer used when turbine and propeller-type mixers cannot provide the required fluid movement. It is used for fluids with a viscosity value of 100,000 and above, with an NRe limit of 10.
9- Propeller Mixer
The propeller mixer is used for fluids with moderate viscosity levels, eliminating the unnecessary cost of helical mixers. It includes the stagnant/dead zones the turbine leaves in the mixing process for the 2 > Re > 10 range.