Because of the simplicity of geometry and principle of functionality bubble columns are often used
for chemical and biological reactors.
The example shown here investigates the accuracy of 2-D models by comparing numerical predictions
with experimental observations.
The gas mass flow rate is increased from left to right. The lower flow rates lead to a transient bubble
column whereas higher flow rates lead to a stationary distribution of the gas bubbles.
The comparison with the experimental observations reported in  is very good.
 Chem.-Ing. Tech. 66 (1994) Nr. 4 S. 505-510