Two‐phase, steam‐water critical flow

Two-phase critical flow of steam-water mixtures has been investigated oyer a pressure range from 4 to 43 lb./sq. in. abs. and a quality range from saturated vapor to 1% (weight) vapor. Discharges were measured from 1/4-, 1/2-, 3/4-, and 1-in. pipes and from annuli of intermediate crosssectional areas. The experimental mass flow rates are always greater than the values calculated on the basis of a homogeneous fiow model. Several empirical methods for correlating the data were determined, and comparisons are presented of the predictions of several analytical flow models. (auth)