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COSMOS-L: Flow during Critical Heat Flux

Kaiser, Florian; Gabriel, Stephan

Abstract:
Video of flow boiling under forced convection in an annular gap during the appearance of the Critical Heat Flux (CHF). The measuring position is in a distance of 306 mm of the inlet into the annulus. The total heated langth is about 326 mm. CHF always applied at the top end close to the displayed video position.
On the one hand, the flow is shown for about 45 seconds before CHF applied and on the other hand 30-45 seconds after CHF was reached. Directly after detecting the CHF (temperature rise), the heating power was shut off. The temporal appearance of the CHF is marked in the video.
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. The presented video is visualized with 25 fps.
The following overview shows the measuring points and recorded framerates in the video:
- T80G400P2000 (3.000 frames per second)
- T80G600P2000 (3.000 fps - starting at 2:00)
- T65G400P2000 (3.000 fps - starting at 3:45)
- T80G400P1200 (4.000 fps - starting at 5:30)

The whole series was recorded on the test facility COSMOS-L of the Institute for Thermal Energy Technology and Safety (ITES).
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Zugehörige Institution(en) am KIT Institut für Thermische Verfahrenstechnik (TVT)
Institut für Thermische Energietechnik und Sicherheit (ITES)
Publikationstyp Audio & Video
Publikationsdatum 03.12.2020
Erstellungsdatum 02.12.2020
DOI 10.5445/IR/1000127105
Identifikator KITopen-ID: 1000127105
HGF-Programm 32.02.02 (POF III, LK 01) Sicherheitsanalysen: Thermohydraulik
Lizenz Creative Commons Namensnennung 4.0 International
Serie Flow boiling in an annular gap close to DNB
Folge 15
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