Critical pressure ratio of two-phase flows

✍ Scribed by F. Hardekopf; D. Mewes

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 695 KB
• Volume: 1
• Category: Article
• ISSN: 0950-4230
• DOI: 10.1016/0950-4230(88)80030-5

✦ Synopsis

The dapressurization of a pressure vessel, containing a liquid or a gas is limited by the maximum possible mass flux. The maximum mass flux occurs, at a certain decrease in pressure. The ratio of the pressures in the environment and inside the vessel must be below a certain critical value. The critical pressure ratio depends on the thermodynamic state of the fluid inside the vessel and the geometrical dimensions of the outlet cross-section, which can be a pipeline, a safety valve or a rupture disc. The results of known theoretical and experimental work are presented. In previous experiments, saturated liquids, two-phase flows or pure vapours were examined. To precalculate the critical pressure ratio, certain assumptions are necessary. They are derived for three welldefined cross-sections of the vessel outlet.