Dynamic Gas Injection

The previous investigations showed that the pulsed aeration leads to higher oxygen mass transfer rates in specific cases. In narrow aeration columns positive effects could be shown for higher pulsation frequencies whereas in the DN900 column these effects were only pre-sent for higher flow rates in low frequencies. Investigations of bubble size distributions showed that the bubble size is not the only factor leading to increased oxygen mass transfer rates and that the positive effects depend on the geometry and the liquid flow behavior in the reactor. Further experiments therefore are focused on fundamental investigation the liquid flow behavior during pulsed aeration. A new experimental setup was constructed to study these hydrodynamic effects in 2D to enable a better understand of the underlying effects.