A qualitatively new modelling approach is proposed to analyze both the steady and unsteady two-phase blowdown flows in short channels and ducts. It is found that the rapid growth of the dispersed vapor phase in the flashing flows results in anabrupt increase of flow acceleration nearer to the channel exit. In the case of the boiling emulsions flow the high values of flow acceleration can cause the breakup of liquid droplets of the emulsion.
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