Drop formation in a co-axial injecting fluid device

The transition from dripping (droplet formation close to the nozzle) to jetting (droplet formation farther downstream) in microfluidic co-axial injection devices has recently  been related to the transition from an absolute instability to a convective instability, as seen in the figure.

Figure from Guillot et al. 2008

Figure from Guillot et al. 2008

Together with the Ph.D. student Laura Augello we investigate the effect of the inlet geometry on the drop formation by means of a global stability analysis.

Paper in preparation