...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Heat Transfer >Correlations of Wave Characteristics for a Liquid Film Falling Down Along a Vertical Wall
【24h】

Correlations of Wave Characteristics for a Liquid Film Falling Down Along a Vertical Wall

机译：沿垂直壁落下的液膜的波特性的相关性

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

The behavior of a liquid film that flows down countercurrently along the inner surface of a circular pipe was examined. In the experiments of the present study, silicone oils of 500 cS, WOO cS, and 3000 cS, as well as water, were used as the liquid phase. The gas phase was air. The vertically oriented test section was a circular pipe of 30 mm in inner diameter and 5.4 m in length. The substrate thickness of the silicone films, the film Reynolds numbers of which were quite low, was close to the mean film thickness, while the water film substrate was much thinner than the mean film thickness. Waves were observed on the substrate. Waves of a certain amplitude were confirmed to exist, even on the silicone films near the flooding occurrence, where the film Reynolds number was quite low. The mean film thicknesses of the silicone films, as well as that of the water film, were well expressed by applying the universal velocity profile to the film flow. When the film Reynolds number was lower than 600, the wave velocity was well predicted as the velocity of small perturbation waves on a laminar film. As the film Reynolds number became large, the wave velocity became slower than the small perturbation wave velocity. The correlation for the wavelength was developed based on the present experimental results. Combining this correlation with the Nosoko correlations and modifying the constants and exponents of the parameters in the equations, new correlations for the wave velocity and maximum film thickness were proposed. These new correlations were used to predict the wave velocity and the maximum film thickness to an accuracy of within 15%.
机译：研究了沿着圆形管的内表面逆流向下流动的液膜的行为。在本研究的实验中，将500 cS，WOO cS和3000 cS的硅油以及水用作液相。气相是空气。垂直取向的测试部分是内径为30 mm，长度为5.4 m的圆形管。有机硅膜的基底厚度（其膜的雷诺数非常低）接近于平均膜厚度，而水膜基底比平均膜厚度薄得多。在基板上观察到波浪。即使在水淹发生附近的硅膜上，也存在一定振幅的波，其中膜的雷诺数非常低。通过将通用速度曲线应用于膜流，可以很好地表达有机硅膜以及水膜的平均膜厚。当薄膜雷诺数低于600时，波速被很好地预测为层状薄膜上的小摄动波的速度。随着胶片雷诺数变大，波速变得比小摄动波速慢。基于当前的实验结果，开发了波长的相关性。将该相关性与Nosoko相关性相结合，并修改方程中参数的常数和指数，提出了波速和最大膜厚的新相关性。这些新的相关性用于预测波速和最大膜厚，精度在15％以内。

著录项

  • 来源
    《Journal of Heat Transfer》 |2009年第8期|082901.1-082901.9|共9页
  • 作者

    Yasuo Koizumi; Ryou Enari; Hiroyasu Ohtake;

  • 作者单位

    Department of Functional Machinery and Mechanics, Division of Creative Engineering, Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda-shi, Nagano 386-8567,Japan;

    Nippon PMAC Co., Ltd., 3150 liyama, Atsugi-shi, Kanagawa 243-0213,Japan;

    Department of Mechanical Engineering, Kogakuin University, 2665-1 Nakano-machi, Hachioji-shi, Tokyo 192-0015, Japan;

  • 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

    falling film; film thickness; waves; wave height; wave velocity; wavelength;

    机译：落膜膜厚波浪;波高波速波长;

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