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COSMOS-L Forced Convection boiling in a concentric annular gap - T80G400P2000 - 90% of CHF power


Florian Kaiser, Stephan Gabriel

Beteiligtes Institut

Fakultät für Chemieingenieurwesen und Verfahrenstechnik (CIW)
Institut für Thermische Energietechnik und Sicherheit (ITES)
Institut für Thermische Verfahrenstechnik (TVT)




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. Deionized water is used as test medium. The CHF occurs as departure from nucleate boiling (DNB). At the end of each video the boundary conditions are described. 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 position 1 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. Heiler (ProScience GmbH) for their brilliance in the lab and wonderful collaboration during the whole project.
The authors are grateful for the financial support by the Federal Ministry for Economic Affairs and
Energy (BMWi), who fund this research under the funding code 1501473B.


Departure from Nucleate Boiling, flow boiling, thermohydraulics, forced convection boiling, Critical Heat Flux

Laufzeit (hh:mm:ss)



Flow boiling in an annular gap close to DNB

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Creative Commons Namensnennung 4.0 International

Auflösung 1280 x 720 Pixel
Seitenverhältnis 16:9
Audiobitrate 128000 bps
Audio Kanäle 2
Audio Codec aac
Audio Abtastrate 48000 Hz
Gesamtbitrate 936532 kbps
Farbraum yuv420p
Container mov,mp4,m4a,3gp,3g2,mj2
Medientyp video/mp4
Dauer 139 s
Dateiname DIVA-2020-785_hd.mp4
Dateigröße 16.263.241 byte
Bildwiederholfrequenz 25
Videobitrate 802608 kbps
Video Codec h264