reactions in a stirrer tank


Usual processes in a stirrer tank are mixing, dispersing and desolving of particles, fermentation and crystallization.

It is important and intressting to know the influence of the stirrer geometry, baffles and stirrer rpm on the process. Experiments in reality are costly.


A cfd simulation delivers the conditions inside a vessel. The geometry and the physical properties of the fluid are definable and adjustable.

The results of the simulation are the velocity, pressure, temperature and concentrations if there is one. The required power to actuate the mixer and its Ne-number can be evaluated.


determination of mixing quality with particle distribution

One method to quantify the mixing quality is to distribute particles over time in the simulation:

With tracking the particles over time, splitting the geometry in small volumes and asigning the particles to the small volumes it is possible to calculate the average deviation for the particles in the small volumes over time:

The chart above shows the average deviation over time for two different geometries.