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首页> 外文会议>The 2001 ASME International Mechanical Engineering Congress and Exposition, 2001, Nov 11-16, 2001, New York, New York >CRITICAL HEAT FLUX DURING REFLOOD TRANSIENTS IN SMALL HYDRAULIC DIAMETER GEOMETRIES
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CRITICAL HEAT FLUX DURING REFLOOD TRANSIENTS IN SMALL HYDRAULIC DIAMETER GEOMETRIES

机译：小液压直径几何中的瞬变过程中的临界热通量

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摘要

Critical Heat Flux (CHF) at a low flow condition in a small hydraulic diameter duct is an important phenomenon for a MTR/ATR (Materials Test Reactor/Advanced Test Reactor) design under a number of accident conditions including reflood transients. Current CHF models in the literature, such as the Mishima/Nishihara and Oh/Englert CHF models, are based on macroscopic system parameters and not local thermal hydraulic conditions. These macroscopic parameter-based models cannot be readily used for analysis in transient best-estimate thermal hydraulic codes. This investigation focuses on developing a low flow rate CHF correlation, based on local conditions, that is amenable to implementation into a best-estimate transient thermal hydraulic code for a small hydraulic diameter channel. The model development proceeds with a means of correlating CHF data to local conditions parameters and then applying a correction factor to the resulting correlation, that permits accurate predictions over a range of pressures. An evaluation of the proposed local conditions-based CHF model is conducted by predicting independent sets of CHF experimental results over a range of flow rate, pressure, and sub cooling conditions. Conclusions on the viability of the proposed CHF model and suggestions for future efforts in improving the reflood heat transfer CHF models for small hydraulic diameter ducts are provided with an evaluation of the model results.
机译：在小直径液压管道中低流量条件下的临界热通量（CHF）是在许多事故条件（包括回潮瞬变）下进行MTR / ATR（材料测试反应堆/高级测试反应堆）设计的重要现象。文献中的当前CHF模型（例如Mishima / Nishihara和Oh / Englert CHF模型）是基于宏观系统参数而非局部热工况的。这些基于宏观参数的模型不能轻易地用于瞬态最佳估计热工水力代码中的分析。这项研究着重于根据当地情况开发低流量CHF相关性，该相关性适合于为小水力直径通道实现最佳估计的瞬态热水力代码。模型的开发通过以下方法进行：将CHF数据与局部条件参数相关联，然后将校正因子应用于所得的相关性，从而允许在一定压力范围内进行准确的预测。通过在流量，压力和过冷条件范围内预测独立的CHF实验结果集，对建议的基于局部条件的CHF模型进行评估。对所提出的CHF模型的可行性得出结论，并为改进小型水力直径管道的回流换热CHF模型的未来工作提供了建议，并对模型结果进行了评估。

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