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COSMOS-L Forced Convection boiling in a concentric annular gap - T80G400P2000 - 50% of CHF power

Kaiser, Florian; Gabriel, Stephan


Video of flow boiling under forced convection in an annular gap. It was recorded at different measuring positions at a specific percentage of the heating power required for critical heat flux (CHF). The flow direction is vertical from bottom to top. The CHF occurs as departure from nucleate boiling (DNB). At the end of each video the boundary conditions are described. Deionized water was used as test medium. All videos were taken at a framerate of 3000 fps and the presented video is visualised with 25 fps giving an representative impression of the flow for approx. one second.
In this video, the displayed video of the measuring positions 1 and 2 does not accurately represent the time line as necessary post-treatment operations also effected the time dimension.

The whole series was recorded on the test facility COSMOS-L of the Institute for Thermal Energy Technology and Safety (ITES).
Further information is available under:

We would like to thank Prof. Dr.-Ing. T. Wetzel (TVT) for his expert advices and encouragement to publish this video series, as well as to G. Albrecht (ITES) and W. ... mehr

Zugehörige Institution(en) am KIT Institut für Thermische Energietechnik und Sicherheit (ITES)
Institut für Thermische Verfahrenstechnik (TVT)
Publikationstyp Audio & Video
Publikationsdatum 23.11.2020
Erstellungsdatum 11.11.2020
Sprache Englisch
DOI 10.5445/IR/1000126559
Identifikator KITopen-ID: 1000126559
HGF-Programm 32.02.02 (POF III, LK 01) Sicherheitsanalysen: Thermohydraulik
Lizenz Creative Commons Namensnennung 4.0 International
Schlagwörter Departure from Nucleate Boiling; flow boiling; thermohydraulics; forced convection boiling; Critical Heat Flux
Serie Flow boiling in an annular gap close to DNB
Folge 3
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