Two-phase Pressure Drop in a Natural-circulation Boiling Channel

Résumé du livre

Experimental two-phase pressure drop data were obtained from a 1/4 x 2 x 60-inch vertical, uniformly heated, test section. The local volume fraction of steam was measured simultaneously with the pressure drop, thus allowing separation of the terms for hydrostatic and acceleration pressure drops from the over-all static pressure drop. The results are expressed in terms of an average two-phase friction factor multiplier, R = DELTA P(sub TPF)/ DELTA P(LO), and are compared with the Martinelli-Nelson correlation, the Lottes-Flinn correlation, and a correlation combining that of Martinelli-Nelson and a flow-rate parameter. The ranges of variables include: pressure from 150 to 600 psig; power density from 17.2 to 94.5 kw/liter of coolant; sub-cooling from 4.8 to 25.7 deg F; exit qualities from 0.009 to 0.065; exit steam volume fraction from 0.19 to 0.77; and velocities from 2.56 to 3.43 fps.