Saturated Pool Nucleate Boiling on Heat Transfer Surface with Deposited Sea Salts

[+] Author and Article Information
Shinichiro Uesawa

Japan Atomic Energy Agency

Yasuo Koizumi

Japan Atomic Energy Agency

Mitsuhiko Shibata

Japan Atomic Energy Agency

Hiroyuki Yoshida

Japan Atomic Energy Agency

1Corresponding author.

ASME doi:10.1115/1.4036987 History: Received December 08, 2016; Revised May 15, 2017


Seawater was injected into reactor cores in the accident at the Fukushima Daiichi Nuclear Power Station. Saturated pool nucleate boiling heat transfer experiments of NaCl solution, natural seawater and artificial seawater as well as distilled water were performed to examine the effect of salts on boiling heat transfer. The heat transfer surface was made of a printed coper circuit board. A boiling state was recorded with a high speed video camera. A surface temperature distribution was measured with an infrared camera. The concentration of the NaCl solution and the artificial sweater was varied in the range of 3.5 ~ 10 wt% in the experiments. Boiling curves were well predicted with the Rohsenow correlation although large coalescent bubble formation was suppressed in NaCl, natural seawater and artificial seawater experiments. Deposit of calcium sulfate CaSO4 on the heat transfer surface was observed in the experiments of artificial seawater. This deposit layer formation resulted in the initiation of slow heat transfer surface temperature excursion at a lower heat flux than a usual critical heat flux. A unique relation was confirmed between the concentration of artificial seawater in bulk fluid and the vaporization rate on the heat transfer surface at which the slow heat transfer surface temperature excursion was initiated. This relation suggested that if the bulk concentration of sea salts in seawater exceeded 11 wt%, the deposition of calcium sulfate on the heat transfer surface might occur even if a heat flux was zero.

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