Critical air/water blow-down in safety valves at low qualities

Publikationstyp
Journal Article
Date Issued
2011
Sprache
English
Author(s)
Moncalvo, Davide  
Friedel, Lutz  
Strömungsmechanik V-5(H)
TORE-URI
https://hdl.handle.net/11420/44377
Journal
Journal of hazardous materials  
Volume
186
Issue
2-3
Start Page
2162
End Page
2165
Citation
Journal of Hazardous Materials 186 (2/3): 2162-2165 (2011)
Publisher DOI
10.1016/j.jhazmat.2010.12.056
Scopus ID
2-s2.0-79751539060
Publisher
Elsevier
Critical air/water blow-downs in safety valves for qualities from 0.01 to 0.113 and mass flow rates from 1.5 up to 4.3. kg/s have been observed in our test facility. These critical blow-downs are characterized by a large void fraction and by an intense mixing of the phases both in the valve body and in the outlet pipe. A qualitative estimation of the flow pattern in the outlet pipe using the map of Taitel and Dukler suggests that these air/water flows are intermittent flows - presumably slug flows - evolving to annular flows for qualities above 0.1. Intermittent flows are also predicted for critical air/water and air/glycerine flows taken from the literature for the same safety valve at slightly larger relieving pressures.
Subjects
Blow-down
Critical flows
Flow map
Safety valve
DDC Class
530: Physics