Multimodal imaging for intra-droplet gas-cavity observation during droplet fragmentation

TL;DR

This study combines PLIF and shadowgraphy to observe water droplet fragmentation, revealing internal gas cavities that influence droplet breakup and topology changes, providing new insights into the fragmentation process.

Contribution

It introduces a multimodal imaging approach to visualize internal gas cavities during droplet fragmentation, enhancing understanding of the breakup mechanisms.

Findings

Gas cavities inside droplets affect topology changes.

Cavities can act as weak spots for droplet split-off.

Shadowgraphy results align with previous studies, PLIF offers new internal insights.

Abstract

Herein, planar laser-induced fluorescence (PLIF) is used in combination with shadowgraphy to study water-droplet aerobreakup. The acquired shadowgraph data are in agreement with previous visualization studies but differ from the PLIF results, yielding new insights into the fragmentation process. In particular, the PLIF data reveal changes in droplet topology during fragmentation that result from the entrapment or formation of gas cavities inside the liquid phase. In some instances, topological modification can be observed to arise from the presence of these cavities. In addition, the cavities may act as weak spots, facilitating droplet split-off.