沸騰によるバーンアウトの研究 : 第2報, サブクーリング, 管路径および含有空気量の影響

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タイトル別名
  • Experimental Studies of the Burnout under the Boiling : 2nd Report, On the Effects of Subcooling, Tube Diameter and Air Content
  • フットウ ニ ヨル バーンアウト ノ ケンキュウ 2

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抄録

Continued from the first report, this paper deals with the effects of subcooling, tube diameter and air content under the transient boiling caused by step heat input. The experiments were carried out under the condition of a natural circulation of the water under atmospheric pressure. The results obtained are as follows : 1) Until the turnout occurs, the surface temperature of heat generator (nichrome wire) is independent of the subcooling, the tube diameter or the air content, and the characteristics of heat transfer are similar to the steady boiling. 2) The time lag to the burnout caused, which increases with the decreasing of the power input, is proportional to the subcooling or the tube diameter, but it has no relation to the air content. 3) When the value of subcooling, the tube diameter or the power input is large, the burnout is caused by the partial film boiling, while it is caused by the bubble blocking when that value is small. In the case of the subcooling of 0°C, especially, the burnout occurs owing to the film boiling without being affected by the tube diameter. 4) The critical heat flux, which does not cause the burnout, depends on the subcooling or the tube diameter, but it is independent of the air content.

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