• 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 >Population balance modelling for subcooled boiling flow of liquid nitrogen in a vertical tube
【24h】

Population balance modelling for subcooled boiling flow of liquid nitrogen in a vertical tube

机译：垂直管中液氮过冷沸腾流动的总体平衡模型

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

Population balance equations combined with a three-dimensional two-fluid model were employed to predict subcooled boiling flow of liquid nitrogen in a vertical upward tube. Closure correlations describing bubble nucleation and departure on the heating surface is indispensable when modeling subcooled boiling flow using a two-fluid model. Due to the small latent heat of vaporization and surface tension, nucleation and departure of nitrogen vapor bubble has different characteristics to those of high-boiling liquids. Based on the mechanism of boiling heat transfer and the unique physical properties, some important bubble model parameters were modified to be applicable to the modeling of liquid nitrogen. In this study, some modified closure correlations of the bubble departure diameter, bubble departure frequency and density of the active nucleation sites were incorporated into the frame of the two-fluid model and the CFX code. The distribution patterns of different discrete bubble classes and void fraction in the wall-heated tube were systematically analyzed. The partition of the three components of wall heat flux along the tube and the instability of bubbly flow were also studied in the paper. Good agreement was achieved on the local heat transfer coefficient against experimental measurements, which demonstrated the accuracy of the improved model.
机译：人口平衡方程与三维二维流体模型相结合，用于预测垂直向上管中液氮的过冷沸腾流量。当使用双流体模型对过冷沸腾流进行建模时，描述加热表面气泡成核和离开的闭合相关性是必不可少的。由于汽化潜热和表面张力小，氮汽泡的成核和离开具有与高沸点液体不同的特性。基于沸腾传热的机理和独特的物理性能，对一些重要的气泡模型参数进行了修改，以适用于液氮的建模。在这项研究中，将气泡离开直径，气泡离开频率和活性成核位点密度的一些修正的闭合相关性纳入了双流体模型和CFX代码的框架中。系统地分析了壁加热管中不同离散气泡类别和空隙率的分布规律。本文还研究了沿管壁热通量的三个分量的分配以及气泡流动的不稳定性。在局部传热系数与实验测量值之间取得了很好的一致性，这证明了改进模型的准确性。

著录项

  • 来源
  • 作者

    S.M. Wang; J. Wen; Y.M. Li; S.H. Wang; Y.Z. Li;

  • 作者单位

    School of Energy and Power Engineering, Xi'an jiaotong University, Xi'an 710049, China;

    School of Energy and Power Engineering, Xi'an jiaotong University, Xi'an 710049, China;

    School of Energy and Power Engineering, Xi'an jiaotong University, Xi'an 710049, China;

    School of Energy and Power Engineering, Xi'an jiaotong University, Xi'an 710049, China;

    School of Energy and Power Engineering, Xi'an jiaotong University, Xi'an 710049, 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

    population balance; liquid nitrogen; subcooled boiling; void fraction;

    机译：人口平衡;液氮过冷沸腾空隙率;

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