Simulation 2-blade Stirrer with Baffle

If you want to simulate the mixing process in a 2-blade stirrer with a baffle, NOGRID points CFD software is an excellent choice.

Use of 2-blade stirrers

The 2-blade stirrer in this case study is a tangential impeller type, typically used for medium-viscosity media. The containers used often vary in their degree of slenderness and bottom design. This 2-blade stirrer has a conical bottom, making it suitable for pressure-resistant mixing processes. Additionally, the conical shape allows for quick and efficient emptying.

Containers with high aspect ratios, like the one in this study, are usually designed for large-volume applications. The 2-blade stirrer does not have a pronounced conveying effect, as the container is only moved tangentially. To counteract the tangential flow and prevent vortex (trombe) formation, baffles are used in the setup. These baffles help stabilize the flow and improve overall mixing efficiency.

Mixing plays a key role in the chemical industry and is involved in processes such as dispersion of two or more liquid, powdery, or gaseous components, the deagglomeration to prevent lump formation, and the homogenization of mixtures. 

Improve product performance and reduce costs

Mixing simulation helps to analyze the flow within an agitator, enabling quick recommendations for optimizing design and operating parameters. This leads to improved product performance and reduced production and maintenance costs. 

Compute any conceivable agitator geometry with mixing simulation

NOGRID offers a wide range of rheology models including those commonly used in the chemical industry. Its unique capability to handle moving parts within the fluid domain allows for the simulation of any conceivable agitator geometry and operating mode, such as

• rotating and counterwise rotating agitator blades, possibly moving up and down periodically at the same time
• overlapping operation ranges of moving parts as found in twin-screw agitators
• free surfaces at inlets or for different fluid levels or for fast rotating agitators with high centrifugal forces

Benefit of very short computation time

One  of the key strengths of NOGRID's meshless CFD software is the fast preprocessing - no grid generation is required - and the outstanding short computation times, even for complicated moving parts typically found in agitators.

Capabilities of NOGRID software

NOGRID combines the ability to handle free surface flows and moving parts within the domain. This leads to the following advantages:

• computation is in full 3D solving complete Navier-Stokes-Equations
• easy and intuitive setup  for mixing cases
• free definable material properties by equations or curves
• evaluation of the mixing quality
• open or closed domains including inflow and outflow areas (non-batch mode)
• moving of the mixers in any direction