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International Heat Transfer Conference 6

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)


K. Trambauer
Technische Universität München Lehrstuhl A für Thermodynamik

Johannes Straub
Technische Universität München Arcisstr. 21, 8000 München 2, FRG

DOI: 10.1615/IHTC6.3570
pages 119-124


Under the aspects of nuclear reactor safety, experiments were conducted to determine the heat transfer rate of condensing steam flowing up- and downwards along a vertical ice surface. The test section was a 1 m long channel with a rectangular cross section of 140 × 70 mm2, partially filled with ice. Temperatures, total pressure, static pressure of the steam, as well as the melting rate were measured. Furthermore, high speed pictures of the two phase flow were taken. The steam velocity was varied between 4 and 80 m/s at a pressure of approximately 1 bar. Melting rates of 0.6 to 6 mm/s were observed. No effect of the gravity on the liquid phase was detected at high steam velocity. With low velocities, the water film flowing downwards was not severely effected by the vapor counter flow. Both gravity and vapor-flow effects were equally efficient at moderate velocities. Therefore, a churn flow was observed as the steam flew upwards. The experimental data for the heat transfer coefficient were correlated to the vapor velocity by the equation Nu = Nuo + C2 Rev.

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