How do you choose an impeller type?
The size of vessel used for mixing will determine the diameter of the impeller. A general rule of thumb for axial or radial flow patterns is the diameter of the impeller be ⅓ of the vessel’s diameter, so a 10 cm beaker would require approximately 3 cm impeller.
What is the flow pattern of impeller?
Axial flow impellers have an up and down flow pattern, ideal for applications where solids suspension or stratification is a challenge. The flow pattern produced by typical axial flow impeller produces an excellent top to bottom motion when the agitator is center mounted, and the vessel is fully baffled (see Fig 1B).
What are the criteria for selecting the impeller based on viscosity?
Viscosity of the material is important to consider while choosing an impeller. For lower viscosities which are closer to water like consistency, a prop impeller is recommended. As for higher viscosities and thicker substances, a pitched blade turbine or a vertical blade turbine is appropriate.
What is mixing impeller?
The impeller is the component of a mixer that does the actual mixing and produces the results. That’s because when it rotates, it creates fluid flow and shear patterns. While there are many types of impellers, there are 4 main types we use when engineering mixers.
How do I know what size impeller I need?
The trick is to measure the radius and multiply it by 2 to get the diameter. Measure the outer most tip of the blade to the center of the bore to obtain the radius. Therefore, a propeller or impeller that measures a radius of 3” from the tip of the blade to the center of the bore will have a diameter of 6”.
Which one is axial flow impeller?
In general, axial-flow impellers have blades which make an angle of less than 90° to the plane of rotation and promote axial top-to-bottom motion. Propellers are axial-flow devices, as are pitched-blade turbines such as that shown in Figure 7.19.
Which impeller is good for low viscous liquid?
In many cases, a hydrofoil impeller blade is well-suited for lower viscosities, while an axial flow or turbine pitched blade is better for mixing highly viscous substances.
How often should impeller be replaced?
How often should the impeller on a boat be replaced? It is recommended that a boat impeller be replaced every two to three years or 300 hours, whichever comes first. However, it is suggested to also visually inspect your impeller at the beginning of each season for any signs of wear or damage.