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Report No.

Pool nucleate boiling for seawater containing minerals

Uesawa, Shinichiro ; Koizumi, Yasuo; Yoshida, Hiroyuki 

Since seawater was injected into cores in the accident at the Fukushima Daiichi Nuclear Power Station of Tokyo Electric Power Company, pool nucleate boiling heat transfer experiments of the distilled water, the real seawater and the 3.5-10 wt% artificial seawater were conducted to examine the effect of sea-salt-deposition on a heat transfer surface. In the seawater experiments, the sea salt which was calcium sulfate was deposited on the heat transfer surface at a certain heat flux. At the same time, the temperature of the heat transfer surface kept rising. The surface temperature rose above 473 K although input heating power was constant. The heat transfer surface temperature rising was caused by the growth of the deposited salt layer, because the deposited calcium sulfate has quite low thermal conductivity. In addition, the relation between the concentration of seawater and the heat flux when the calcium sulfate grew on the heat transfer surface indicated that the deposition occurred by the vaporization in the vicinity of the heat transfer surface.



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