• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment >Visualization and void fraction distribution of downward gas-liquid two-phase flow in a plate heat exchanger by neutron radiography
【24h】

Visualization and void fraction distribution of downward gas-liquid two-phase flow in a plate heat exchanger by neutron radiography

机译：中子射线照相法在板式换热器中气液两相向下流动的可视化和空隙率分布

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

Adiabatic vertically downward air-water two-phase flows in a commercial plate heat exchanger were visualized by a neutron radiography method as a non-destructive test in order to clarify the flow characteristics and the differences of the liquid distributions from those of the vertically upward flows. Flow behaviors in a single channel and a multichannel plate heat exchanger were investigated. From the visualized results of the flows in a single channel, it was shown that water fell down without a spreading at a lower gas volumetric flux of less than about 2 m/s. In the case of a higher gas volumetric flux above 2 m/s, liquid spread around the enlarged section and the liquid distribution in the main part of the heat exchanger seemed to be homogenous. Measured average void fractions for the air-water downward flows showed almost the same tendency as those for the upward flows in spite of the difference of the flow patterns. On the other hand, liquid distributions into 18 parallel channels were evaluated from the measured results of the liquid volumetric fractions in each channel. It was shown that the liquid distribution depended on the inlet liquid flow rate. However, the effect of the gas flow rate was a little. In the case of higher liquid flow rate, the liquid fraction became higher with a deeper channel due to a larger liquid momentum. However, in the case of a lower liquid flow rate, the opposite tendency was observed, i.e., the liquid fraction in the nearest channel to the inlet was higher.
机译：通过无损检测，通过中子射线照相法对商用板式换热器中的绝热垂直向下的空气-水两相流动进行可视化，以阐明流动特性和液体分布与垂直向上流动的差异。研究了单通道和多通道板式换热器中的流动行为。从单个通道中流动的可视化结果可以看出，水以低于约2 m / s的较低气体体积通量下降而没有扩散。在较高的气体体积通量高于2 m / s的情况下，液体在扩大的部分周围散布，并且在热交换器主要部分中的液体分布似乎是均匀的。尽管流型不同，但测量的空气-水向下流动的平均空隙率却显示出与向上流动几乎相同的趋势。另一方面，根据每个通道中液体体积分数的测量结果评估了18个平行通道中的液体分布。结果表明，液体分布取决于入口液体流速。但是，气体流速的影响很小。在较高的液体流速的情况下，由于较大的液体动量，随着流道的更深，液体分数变得更高。然而，在较低的液体流速的情况下，观察到相反的趋势，即，最接近入口的通道中的液体分数较高。

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