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Transition flow conditions in a cavity formed with an underwater gas ejection

The initial stage of gas emission from a bottom hole into an incompressible liquid is accompanied by the appearance of a gas cavity. At the hole inlet, the gas velocity can be both supersonic and subsonic. Hence, any flow regime, that is, supersonic, subsonic, and transient, are possible theoretically in the cavity itself. An attempt is made to answer the following question: when and under what conditions do flow regimes change?.