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Experimental research on double-hole steam condensation effects and models under different diameters and pitch to diameter ratios conditions

机译：不同直径下双孔蒸汽凝结效应和模型的实验研究及直径比率条件

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摘要

The multi-hole steam Direct Contact Condensation (DCC) is of high efficiency in mass and heat transfer, which has been widely used in the engineering application, especially the advanced nuclear reactor power plant passive safety system. Most of the researches concerned on the single-hole steam DCC characteristics, whereas the multi-hole steam DCC heat transfer effects are influenced by a variety of mutual factors, and the micro mechanisms and models of which are still not very clear yet. In the present work, the double-hole steam condensation effects and models under different spraying diameters and pitch to diameter ratios [P/d_e) conditions are investigated based on the scaled IRWST & ADS experimental facility. The key parameters including the steam plumes, temperature distributions, penetration length, and heat transfer coefficients, etc. are analyzed. The experimental results show that both the P/d_e and d_e can impact the overall condensation behavior and the corresponding penetration length with variation range from -40% to 60% compared to the single-hole condensation cases, further influencing the double-hole steam DCC heat transfer effects. The revised double-hole steam condensation analytical models are proposed to depict the key condensation characteristics. Based on theoretical model and experimental results, the HTC calculation methods are developed to quantitatively estimate the double-hole condensation effects in the range of approximate 0.4-2.8MW/m~2°C, which is in similar magnitude with the single-hole theoretical model. However, in overall, the double-hole HTC values are lower than the single-hole cases under the specific mutual influences between the adjacent plumes including overlapping, coalescences, and possible deflection with angles. The present theoretical and experimental work provide important references for the engineering multi-hole spargers design and modification.
机译：多孔蒸汽直接接触冷凝（DCC）具有高效率的质量和传热，已广泛用于工程应用，特别是先进的核反应堆电厂被动安全系统。大多数关于单孔蒸汽DCC特性的研究，而多孔蒸汽DCC传热效果受各种互联因素的影响，微观机制和模型尚未非常清晰。在本作工作中，基于缩放的IRWST和ADS实验设施研究了不同喷射直径下的双孔蒸汽冷凝效应和模型和直径比率[P / D_E）条件。分析包括蒸汽羽毛，温度分布，渗透长度和传热系数等的关键参数。实验结果表明，与单孔冷凝盒相比，P / D_E和D_E可以影响总凝结行为和相应的渗透长度与-40％至60％的变化范围，进一步影响双孔蒸汽DCC传热效应。建议修改后的双孔蒸汽冷凝分析模型描绘了关键凝结特性。基于理论模型和实验结果，开发了HTC计算方法，以定量估计大约0.4-2.8mW / m〜2°C范围内的双孔冷凝效应，这与单孔理论有类似的幅度模型。然而，总体而言，双孔HTC值低于相邻羽毛之间的特定相互影响的单孔箱，包括重叠，聚合和与角度可能的偏转。本发明的理论和实验工作为工程多孔练习刀设计和修改提供了重要的参考。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第9期|121437.1-121437.11|共11页
  • 作者

    Yuhao Zhang; Qin Yu; Jingpin Fu; Li Feng; Zhimin Qiu; Daogang Lu;

  • 作者单位

    School of Nuclear Science and Engineering North China Electric Power University. No.2 Beinong Road Beijing 102206 China Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy Beijing 102206 China;

    School of Nuclear Science and Engineering North China Electric Power University. No.2 Beinong Road Beijing 102206 China Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy Beijing 102206 China;

    School of Nuclear Science and Engineering North China Electric Power University. No.2 Beinong Road Beijing 102206 China Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy Beijing 102206 China;

    School of Nuclear Science and Engineering North China Electric Power University. No.2 Beinong Road Beijing 102206 China Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy Beijing 102206 China;

    School of Nuclear Science and Engineering North China Electric Power University. No.2 Beinong Road Beijing 102206 China Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy Beijing 102206 China;

    School of Nuclear Science and Engineering North China Electric Power University. No.2 Beinong Road Beijing 102206 China Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy Beijing 102206 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Double-hole steam DCC; P/d_e ratio; Dimensionless penetration length; Double-hole theoretical model; Heat transfer coefficient;

    机译：双孔蒸汽DCC;p / d_e比率;无量纲渗透长度;双孔理论模型;传热系数;

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