Investigation of the Spray Generation due to Bag Breakup Fragmentation Phenomena with Optical Methods in Environmental and Technical Systems

This paper discusses the results of a detailed study of bag breakup spray fragmentation process obtained using various panoramic optical methods: shadow imaging and laser-induced fluorescence (LIF) with high-speed video recording. The experiments were carried out in two fundamentally different configurations. When blowing the air flow above a deep-water layer, with the presence of large-scale waves on the surface, and vice versa in conditions of thin layers of liquid. Comparison of the results of observations demonstrated not only the general similarity of the evolution scenario, but also the dependences of the spatiotemporal scales of the process of fragmentation and the formation of droplets on the characteristic flow velocities according to the bag breakup events. This indicates the universal nature of the phenomena leading to the fragmentation and separation of drops from the surface of a liquid blown by a gas flow in natural and technical hydrodynamic systems of a wide class with scales varying over a wide range.