...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Effects of pipe size on horizontal two-phase flow: Flow regimes, pressure drop, two-phase flow parameters, and drift-flux analysis
【24h】

Effects of pipe size on horizontal two-phase flow: Flow regimes, pressure drop, two-phase flow parameters, and drift-flux analysis

机译：管尺寸对水平两相流量的影响：流量制度，压降，两相流参数和漂移通量分析

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

This paper performs experimental studies to investigate the effects of pipe size on horizontal air-water two-phase flow in a wide range of flow configurations. Some of the major characteristic two-phase flow phenomena of interest include flow regime transitions, two-phase frictional pressure drop, local interfacial structures, and drift-flux analysis. Based on the experimental results obtained in two pipe sizes, the flow regime maps and the correlations for two-phase frictional pressure drop employed in conventional nuclear reactor system analysis codes (TRACE and RELAP) are evaluated. It is found that the flow regime maps in the codes incorrectly predict plug and slug flows as bubbly flow. Effects of pipe size on flow regime transitions are observed, while these effects are not reflected on the maps employed in the codes. The frictional pressure drop analysis suggests that the closure relations used in both TRACE and RELAP can be improved for horizontal two-phase flow. The local time-averaged two-phase flow parameters acquired by a four-sensor conductivity probe including void fraction, interfacial area concentration, bubble velocity, and bubble Sauter-mean diameter provide quantitative descriptions for the interfacial structures in different pipe sizes. It is found that increasing the pipe size tends to cause bubbles to be more concentrated near the top wall in bubbly flow. As a result, the bubble layer occupies a smaller portion of the flow area as pipe diameter increases. Based on the experimental database, drift-flux analysis using both the v(g) vs. j and alpha vs. beta methods is performed. The effect of pipe size on drift-flux analysis is found to be negligible. The global slip is found to be less than one, indicating that the gas phase moves slower than the liquid phase in horizontal bubbly flow. This analysis also provides a predictive method to estimate the void-weighted bubble velocity and void fraction, which can b
机译：本文进行了实验研究，以研究管尺寸在各种流动配置中的水平空气水两相流的影响。感兴趣的一些主要特征两相流现象包括流动制度转换，两相摩擦压降，局部界面结构和漂移通量分析。基于在两个管道尺寸中获得的实验结果，评估流程制度图和用于传统核反应堆系统分析码（痕量和重新迹线）中使用的两相摩擦压降的相关性。发现代码中的流动制度映射被错误地预测插头和块状流量作为气泡流。观察管尺寸对流动制度转换的影响，而这些效果不会反映在代码中使用的地图上。摩擦压降分析表明，对于水平两相流，可以提高迹线和重新逐步的闭合关系。由四传感器电导率探针获取的局部时间平均两相流程参数，包括空隙部分，界面面积浓度，气泡速度和气泡沙油平均直径为不同管道尺寸的界面结构提供定量描述。结果发现，增加管尺寸趋于导致气泡更浓缩，以在顶壁的靠近流动。结果，随着管道直径增加，气泡层占据流动面积的较小部分。基于实验数据库，使用漂移 - 通量分析，使用＆ v（g）＆＆与＆ j＆和＆ alpha＆与＆ beta＆进行方法。发现管尺寸对漂移通量分析的影响可忽略不计。发现全局滑移小于一个，表明气相移动比水平气泡流动的液相慢。该分析还提供了一种预测方法来估计空隙加权气泡速度和空隙率，其可以b

著录项

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