...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ISIJ international >Development of Heat Exchanger with New Mechanism of Scraping Temperature Boundary Layer
【24h】

Development of Heat Exchanger with New Mechanism of Scraping Temperature Boundary Layer

机译：具有刮除温度边界层新机理的换热器的研制

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In recent years various approaches to reduce carbon dioxide emission from iron- and steelmaking industry have been made, and recovery of the waste heat is one of these approaches. Heat exchanger is one of key facilities to recover the waste heat released as sensible heat of fluids. In this study a new concept to raise efficiency of heat exchanger has been proposed. The temperature boundary layer is scraped from moving heat transfer surface by rigid blades to remove the heat transfer resistance of the boundary layer. Some prototypes of the heat exchangers of double-tube type with this concept were made. The inner tube of the heat exchanger rotates and the blades are set on both sides of the inner tube. The performance of the heat exchanger was examined in various combinations of working fluids. The results showed that the overall heat transfer coefficients, which is a key parameter to expresses heat exchanger performance, increased with increase in revolution of the inner tube regardless of working fluids. Thus the effectiveness of this new concept was confirmed. The effect of the boundary layer scraping is remarkable in the liquid–liquid or liquid–steam systems, and the heat transfer coefficient increased by about ten times in some cases. For the combination including gas, although this concept is useful, there still is a room to optimize the design of the heat exchangers to improve the performance. It is expected that practical use of this heat exchanger is great help to recover the waste heat from the industries.
机译：近年来，已经采取了各种方法来减少钢铁工业的二氧化碳排放，并且废热的回收是这些方法之一。热交换器是回收作为流体显热释放的废热的关键设施之一。在这项研究中，提出了一种提高热交换器效率的新概念。用刚性刀片从移动的传热表面刮擦温度边界层，以消除边界层的传热阻力。用这种概念制造了一些双管式热交换器的原型。热交换器的内管旋转并且叶片设置在内管的两侧。在各种工作流体组合中检查了热交换器的性能。结果表明，与工作流体无关，总的传热系数是表示热交换器性能的关键参数，随着内管转数的增加而增加。因此，证实了该新概念的有效性。在液体-液体或液体-蒸汽系统中，边界层刮擦的效果显着，并且在某些情况下，传热系数增加了约十倍。对于包括气体的组合，尽管此概念很有用，但仍有空间可以优化热交换器的设计以提高性能。预期该热交换器的实际使用将极大地帮助回收工业中的废热。

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