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Flow regime and void fraction predictions in vertical rod bundle flow channels

机译：垂直杆束流动通道中的流动制度和空隙分数预测

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摘要

This paper has studied the flow regimes and their transitions in upward gas-liquid two-phase flows in vertical rod bundle flow channels. The past experimental observations on the flow regimes have been extensively reviewed and analyzed. Various flow regimes with the observer-dependent names are re-classified into 5 flow regimes, namely, bubbly, finely dispersed bubbly, cap-bubbly, churn and annular flows according to their different flow characteristics in the vertical rod bundle flow channels. In view of the problems in the available flow regime transition criteria and the drift-flux correlations, this paper has proposed the mechanisms for the bubbly to cap-bubbly flow transition, the cap-bubbly to churn flow transition, the transition to annular flow and the transition to the finely dispersed bubbly flow and developed the corresponding flow regime transition criteria to predict the five flow regimes based on these mechanisms. This paper has further improved Han et al. correlations for the drift-flux parameters of the distribution parameter and the drift velocity to predict the void fractions in the 5 flow regimes, together the newly-developed transition criteria, in the vertical rod bundle flow channels. The newly-developed flow regime transition criteria and the improved Han et al. correlation for the drift-flux parameters of the distribution parameter and the drift velocity have been examined with the experimental data. The examination has concluded that the newly-developed flow regime transition criteria can correctly predict 82.9% of the 451 observed flow regime data in the vertical rod bundle flow channels and the drift-flux model using the improved Han et al. correlation and the newly-developed flow regime transition criteria can give satisfactory prediction for the 959 experimental data of the void fraction with the mean relative error of 0.0766.
机译：本文研究了垂直杆束流动通道中的向上气液两相流动的流动制度及其过渡。对流动制度的过去的实验观察得到了广泛的审查和分析。根据其不同的流动特性在垂直杆束流动通道中的不同流动特性重新分类为5个流量方案，将与观察者相关的名称重新分类为5个流动制度，即气泡，精细分散的气泡，盖子和环形流动。鉴于可用的流动制度转换标准和漂移通量相关性的问题，本文提出了对帽 - 泡沫流过渡的机构，帽子气流过渡，过渡到环形流动和转换到精细分散的气泡流动并开发了相应的流动调节性转换标准，以预测基于这些机制的五个流动制度。本文进一步改善了Han等人。分布参数的漂移通量参数的相关性和漂移速度，以预测5个流动制度中的空隙分数，在垂直杆束流动通道中的新开发的过渡标准。新开发的流动制度转换标准和改进的Han等人。用实验数据检查了分布参数的漂移通量参数和漂移速度的相关性。审查已经得出结论，新开发的流动制度转换标准可以使用改进的HAN等人正确地预测垂直杆束流动通道和漂移通量模型中的451个观察到的流动调节数据的82.9％。相关性和新开发的流动制度转换标准可以令人满意的预测空隙率的959个实验数据，其平均相对误差为0.0766。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第10期|121637.1-121637.24|共24页
  • 作者

    Xu Han; Xiuzhong Shen; Toshihiro Yamamoto; Ken Nakajima; Haomin Sun; Takashi Hibiki;

  • 作者单位

    Department of Nuclear Engineering Kyoto University Kyoto daigaku-katsura Nishikyo-ku Kyoto 615-8540 Japan;

    Institute for Integrated Radiation and Nuclear Science Kyoto University Kumatori-cho Sennan-gun Osaka 590-0494 Japan;

    Institute for Integrated Radiation and Nuclear Science Kyoto University Kumatori-cho Sennan-gun Osaka 590-0494 Japan;

    Institute for Integrated Radiation and Nuclear Science Kyoto University Kumatori-cho Sennan-gun Osaka 590-0494 Japan;

    Nuclear Safety Research Center Japan Atomic Energy Agency Tokai-mura Ibaraki 319-1195 Japan;

    Department of Mechanical Engineering City University of Hong Kong 83 Tat Chee Avenue Kowloon Tong Hong Kong;

  • 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

    Flow regimes; Flow regime transition mechanisms and criteria; Void fraction; Drift-flux model; Rod bundle two-phase flow;

    机译：流动制度;流动制度转换机制和标准;空隙分数;漂移通量模型;杆束两相流量;

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