Experimental Study on High Pressure Steam-Liquid Two-Phase Flow Pressure Drop Instability in Parallel Tube

Steam-liquid two-phase flow pressure drop instability in vertical parallel tubes was studied experimentally in the high-pressure steam-water test loop. The effects of system pressure, mass velocity, inlet sub-cooling, exit throttle and compressible volume on the instability were determined. The threshold of pressure drop instability was obtained. The dimensionless correlations for the prediction of the instability in the vertical parallel tubes were given. The result may be used for the design of the large boiler and steam generators.