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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Boiling heat transfer at liquid-liquid interface between water and molten metal

Get access (open in a dialog) DOI: 10.1615/IHTC12.2310
6 pages

Sinopsis

Measurements of boiling heat transfer on a molten metal surface were performed to obtain boiling curves and heat transfer correlations which can be applied to the analysis of molten core debris cooling by the overlying pool of primary coolant. For this purpose, transient and steady-state experiments using water and molten metal as working fluids were conducted. Measured boiling heat transfer coefficients were compared with existing steady-state heat transfer correlations for a liquid-solid system and for a liquid-liquid system. Visualization of surface waves on the liquid-liquid interface was also made using a high-speed video camera. In steady-state experiments, it turned out that the oxide layer on the molten metal surface affected strongly the boiling curves and the surface stabilityin the nucleate boiling region. The boiling curves with an oxide layer were approximatelyrepr oduced by existing heat transfer correlations and those with no oxide layer in the nucleate boiling agreed well with the Novakovi-Stefanovi correlation for a liquid-liquid system. In transient experiments, it was found that the boiling curves were greatlyinf luenced bythe initial temperature of the molten metal. Due to violent sways of the interface, the measured film boiling heat fluxes were 80% greater than the prediction from Berenson model for solid-liquid system.