Video of flow boiling under forced convection in an annular gap. It was recorded for different applied heating powers until critical heat flux (CHF) was reached. The measuring position is at the top vertical position of the heated test rod. 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.
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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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.