Mixing in Food Industry

Parent Category: Industries

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.

Flow modeling 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.

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

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

 

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.

Meshless CFD in velocity field Velocity field in a free surface flow simulated with meshless cfd

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.

 

Meshless CFD in velocity field twin mixer

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