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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect of honeycomb porous plate on critical heat flux in saturated pool boiling of artificial seawater
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Effect of honeycomb porous plate on critical heat flux in saturated pool boiling of artificial seawater

机译：蜂窝状多孔板对人造海水饱和池沸腾临界热通量的影响

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During a severe nuclear power plant accident, the integrity of the reactor pressure vessel must be assured. In response to a possible fuel meltdown, operators of the current generation of nuclear power plants are likely to inject water into the reactor pressure vessel cavity to cool down the reactor vessel wall, preserving its integrity and avoiding leakage of radioactive material. This study considers the use of seawater to flood a reactor pressure vessel cavity combined with the attachment of a honeycomb porous plate (HPP) on the vessel outer wall as a way to improve the safety margins for in-vessel retention of fuel. In long-duration experiments, saturated pool boiling of artificial seawater was performed with an upward-facing plain copper heated surface 30 mm in diameter. The resulting value for critical heat flux (CHF) was 1.6 MW/m2at atmospheric pressure, a value significantly higher than the CHF obtained when the working fluid was distilled water (1.0 MW/m2). It was verified that sea-salt deposits could greatly improve surface wettability and capillarity, enhancing the CHF. The combination of artificial seawater and an HPP attached to the heated surface improved the boiling heat transfer coefficient and increased the CHF up to 110% (2.1 MW/m2) as compared to distilled water on a bare surface. After the artificial seawater experiments, most of the wall micropores of the HPP were clogged due to sea-salt aggregation on the HPP top and bottom surfaces. Thus, the CHF enhancement observed in this case was attributed mainly to the separation of liquid and vapor phases provided by the HPP channel structure and improvement of surface wettability and capillarity by sea-salt deposition.
机译：在严重的核电站事故中，必须确保反应堆压力容器的完整性。响应于可能的燃料熔化，当前一代核电站的操作者可能将水注入反应堆压力容器腔中以冷却反应堆容器壁，从而保持其完整性并避免放射性物质泄漏。这项研究考虑了利用海水淹没反应堆压力容器腔体，并在容器外壁上安装蜂窝状多孔板（HPP），以提高在容器中保留燃料的安全裕度。在长时间的实验中，使用直径为30μmm的朝上的纯铜加热表面对人造海水进行饱和池沸腾。在大气压下，临界热通量（CHF）的最终值为1.6 MW / m2，该值明显高于工作流体为蒸馏水时的CHF（1.0 MW / m2）。事实证明，海盐沉积物可以大大改善表面润湿性和毛细作用，从而提高CHF。与裸露表面上的蒸馏水相比，人造海水和附着在加热表面上的HPP的组合改善了沸腾传热系数，并将CHF最高提高了110％（2.1 MW / m2）。经过人工海水实验后，由于HPP顶部和底部表面上的海盐聚集，大部分HPP壁微孔被堵塞。因此，在这种情况下观察到的CHF增强主要归因于HPP通道结构所提供的液相和气相的分离，以及由于海盐沉积而提高的表面润湿性和毛细作用。

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