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The pressure ratio of critical two‐phase flows
Author(s) -
Hardekopf Friedhelm,
Mewes Dieter
Publication year - 1989
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.270120113
Subject(s) - pressure drop , mass flux , mechanics , cabin pressurization , thermodynamics , flux (metallurgy) , work (physics) , overall pressure ratio , aspect ratio (aeronautics) , chemistry , vapours , pressure vessel , two phase flow , flow (mathematics) , materials science , physics , composite material , organic chemistry , gas compressor , neuroscience , biology
Abstract Depressurization of a pressure vessel, containing a liquid or a gas is limited by the maximum possible mass flux. This flux occurs at a certain drop in pressure. The ratio of ambient pressure to that inside the vessel must be less than a certain critical value. The critical pressure ratio depends on the thermodynamic state of the fluid inside the vessel and on the geometry of the outlet cross‐section. The outlet can be a pipeline, a safety valve or a rupture disk. The results of known theoretical and experimental work are presented. In previous experiments, saturated liquids, two‐phase flows or pure vapours were examined. In order to predict the critical pressure ratio, certain assumptions are necessary. These are derived for three well‐defined cross‐sections of the vessel outlet.