Parent Category: Industries

MIXING SIMULATION IN FOOD INDUSTRY

Mixing is an important part in food industry and appears in processes such as dispersion of two or more liquid, powdery or gaseous ingredients, deagglomeration to avoid lumps and homogenization of food mixtures.


Improve mixer performance and reduce costs

Mixing simulation can help to understand the flow in an agitator to quickly suggest improvements in construction and operation parameters and to reduce production and maintenance expenses.

Simulate any conceivable agitator geometry

NOGRID offers a wide range of rheology models including those found in food industry. NOGRID's unique abilities to handle moving parts in the fluid domain allow the simulation of any conceivable agitator geometries and operation modes 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 

NOGRID's particular strengths are the rapid preprocessing (NOGRID software is based on a meshless code, which means, no grids need to be generated) and the outstanding short computation time even for complicated moving parts commonly found in agitators.

 

Highly accurate and fast computation of free surfaces in mixing vessels

Frustrum shaped mixing vessel

This example shows a frustrum shaped mixing vessel with a simple rotating blade. The inlet and outlet are omitted. The challenge is the fast and exact computation of the free surface. In particular the agitator blade can partly surface as it is close to the free surface. NOGRID's mixing application masters this challenge easily and provides highly accurate solutions in a short computation time.

Mixing simulation of a simple mixing chamber Mixing simulation of a simple mixing chamber

Figure 1: Velocity field and free surface flow in a simple mixing chamber

 

Twin-screw agitator in a double cylinder

Twin-screw agitators exhibit more complicated fluid mechanical phenomena than found in single-screw agitators. Mesh-based simulation methods usually fail to efficiently deal with the overlapping operating ranges of the rotating blades. In NOGRID software there is no difference in modeling and computation efficiency compared to a single-screw agitators.

 

Mixing simulation of a twin-screw agitator

Figure 2: Velocity field and free surface flow in a twin-screw agitator