• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Mass Transfer >Flow pattern maps for convective boiling of CO_2 and R410A in a horizontal smooth tube: Experiments and new correlations analyzing the effect of the reduced pressure
【24h】

Flow pattern maps for convective boiling of CO_2 and R410A in a horizontal smooth tube: Experiments and new correlations analyzing the effect of the reduced pressure

机译：水平平滑管中CO_2和R410A对流沸腾的流型图：分析减压效果的实验和新的相关性

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this work flow visualizations and measurements are made and analyzed to identify flow regime transitions, slug-to-intermittent, intermittent-to-annular and the dry-out inception, during the flow boiling of CO_2 in a horizontal smooth tube of 6.00 mm of internal diameter, varying the reduced pressure between 0.57 and 0.64, the mass velocity between 150 and 500 kg/m2 s and the heat flux between 5 and 20 kW/m2. Additional experiments for R410A show the effect of the reduced pressure over a wider range, from 0.19 to 0.52, varying the other operating parameters in the same ranges. All together, the new experimental dataset of 1420 observations and heat transfer measurements were utilized to determine the location of the flow pattern transitions, which showed a strong dependency of the vapor quality on the mass velocity for each transition line, for fixed reduced pressure. The dry-out inception line was influenced by the heat flux, as expected. The influence of the reduced pressure was also identified as an important parameter with a remarkable impact. This flow pattern database was then statistically compared with well established methods (Wojtan et al. (2005) [1] for R410A, Cheng et al. (2008) [2] for CO_2) and recent methods [3,4], showing poor agreement in the determination of the intermittent-to-annular flow regime transition for all the methods and in the prediction of the dry-out inception for all the methods, except for Wojtan et al. (2005) [1]. Finally, new easy-to-use correlations are proposed to provide better agreement with the experimental dataset and to explicitly illustrate the effect of the reduced pressure in an effort to generalize this diabatic flow pattern map for broader application.
机译：在这项工作中，对流量进行可视化和测量并进行分析，以识别在6.00 mm的水平光滑管中CO_2的沸腾过程中的流态转换，从塞到间歇，从间歇到环形以及干燥开始。内径，在0.57至0.64之间改变减压，在150至500 kg / m2 s之间改变质量速度，在5至20 kW / m2之间改变热通量。 R410A的其他实验显示了在0.19至0.52的较宽范围内降低压力的效果，在相同范围内改变了其他操作参数。总之，使用1420个观测值和传热测量值的新实验数据集来确定流型转变的位置，对于固定的减压而言，这表明蒸汽质量对每个转变线的质量速度都有很强的依赖性。干燥开始线受热通量的影响，正如预期的那样。减压的影响也被确定为具有显着影响的重要参数。然后将该流量模式数据库与完善的方法（R410A的Wojtan等人（2005）[1]，CO_2的Cheng等人（2008）[2]）和最新方法[3,4]进行统计比较。除了确定Wojtan等人的方法外，所有方法在确定从间歇到环形流动状态的转换以及所有方法的变干开始的预测方面都具有一致性。 （2005）[1]。最后，提出了新的易于使用的相关性，以提供与实验数据集的更好的一致性，并明确地说明了减压的效果，以期将这种非绝热流型图推广到更广泛的应用中。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2012年第6期|p.1519-1528|共10页
  • 作者

    R. Mastrullo; A.W. Mauro; J.R. Thome; D. Toto; G.P. Vanoli;

  • 作者单位

    Department of Energetics, Applied Thermofluidynamics and Air Conditioning Systems, FEDERICOII University, p.le Tecchio 80, 80125 Napoli, Italy;

    Department of Energetics, Applied Thermofluidynamics and Air Conditioning Systems, FEDERICOII University, p.le Tecchio 80, 80125 Napoli, Italy;

    Laboratory of Heat and Mass Transfer (LTCM), Faculty of Engineering (STI), tcole Polytechnique Fe'de'rale de Lausanne (EPFL), Station 9, Lausanne CH-1015, Switzerland;

    Department of Energetics, Applied Thermofluidynamics and Air Conditioning Systems, FEDERICOII University, p.le Tecchio 80, 80125 Napoli, Italy;

    Engineering Department, Sannio University, Corso Garibaldi 107, Palazzo dell'Aquila Bosco Lucarelli, 82100 Benevento, Italy;

  • 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

    CO_2; R410A; convective boiling; flow pattern maps; reduced pressure; prediction methods;

    机译：CO_2;R410A;对流沸腾流型图;减压;预测方法;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号