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The transient ejection due to a bubble bursting at the interface of a liquidwith a gas environment is here described using a dynamical scaling analysisalong the process. We show here that the ejection of a liquid microjet requiresthe backfire of a vortex ring inside the liquid to preserve physical symmetry,which involves a non-trivial scaling. We present the first single uniformlyvalid expression for the size and speed of ejected droplets for the whole rangeof the Ohnesorge and Bond numbers where droplet ejection occurs. The evolutionof the flow variables, the apparent singularity for a critical Ohnesorgenumber, and the dispersion of data around this point are explained. Our modelgeneralizes or displaces other recently proposed ones, impacting for instancethe statistical description of sea spray.

On the physics of transient ejection from bubble bursting