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The flow contraction through sharp-edged short orifices respectively the narrowest flow cross-section or the vena contracta has been measured for water, air and air/water mixture. The results demonstrate that the contraction in the case of subcritical single-phase flow is restricted to values between 0.62 and one, while in the twophase flow it is limited to very narrow ranges of air mass flow qualities where the flow regime is specified as bubbly or spray.

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