Experiments with single bubbles

In these experiments the single spherical and elliptical bubbles were produced with a single stainless steel nozzle (id=0.13 mm and 0.25 mm)in the centre of the sparger plate.
In both cases, bubble rise in a stagnant liquid.
In all experiments 2 l of de-ionized water mixed with resazurin, glucose and sodium hydroxide was used as liquid phase.

Averaged images of elliptical and spherical air bubbles; the measurement section is marked in red.