Prediction of single- and two-phase flow contraction through a sharp-edgedshort orifice

The predictions of a new model for the contraction coefficient of single- a nd two-phase flows through a sharp-edged short orifice are checked against data recently obtained with water, air, and air/water mixture flows. The mo del includes all relevant primary design parameters. The predictions are va lidated for a wide range of conditions and physical properties typically en countered in industrial fluid-dynamic systems. Calculations based on the ne w model are sufficiently accurate for engineering purposes. Reasonable extr apolations to other test conditions with an acceptable accuracy can be expe cted.