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Research Papers: Nuclear Power

Effect of Hydrated Salt Additives on Film Boiling Behavior at Vapor Film Collapse

[+] Author and Article Information
Takahiro Arai

Nuclear Technology Research Laboratory, Central Research Institute of Electric Power Industry, 2-11-1, Iwado Kita, Komae-shi, Tokyo 201-8511, Japant-araj@criepi.denken.or.jp

Masahiro Furuya

Nuclear Technology Research Laboratory, Central Research Institute of Electric Power Industry, 2-11-1, Iwado Kita, Komae-shi, Tokyo 201-8511, Japan

J. Eng. Gas Turbines Power 131(1), 012902 (Oct 01, 2008) (6 pages) doi:10.1115/1.2983056 History: Received July 14, 2008; Revised July 28, 2008; Published October 01, 2008

A high-temperature stainless steel sphere was immersed into various salt solutions to investigate film boiling behavior at vapor film collapse. The film boiling behavior around the sphere was observed with a high-speed digital-video camera. Because the salt additives enhance the condensation heat transfer, the observed vapor film was thinner. The surface temperature of the sphere was measured. Salt additives increased the quenching (vapor film collapse) temperature because the frequency of direct contact between the sphere surface and the coolant increased. Quenching temperature increases with increased salt concentration. The quenching temperature, however, approaches a constant value when the salt concentration is close to its saturation concentration. The quenching temperature is well correlated with ion molar concentration, which is a number density of ions, regardless of the type of hydrated salts.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 5

Extraction of vapor film with image-processing

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Figure 6

Effect of salt additives on vapor film collapse

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Effect of hydrated salt on quenching curve

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Figure 8

Effect of salt additives on vapor film collapse

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Figure 9

Effect of hydrated salt on boiling curve

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Figure 10

Comparison of boiling curves

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Figure 11

Effect of hydrated salt on condensation heat transfer rate

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Figure 12

Effect of solution concentration on quenching curve

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Figure 13

Effect of anion on quenching temperature

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Figure 14

Effect of cation on quenching temperature

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Figure 3

Schematic of experimental apparatus

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Figure 4

Schematic of the stainless steel sphere

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Figure 1

Schematic of the basic process on a large scale vapor explosion

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Figure 2

Schematic of the triggering process on vapor explosion

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