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Condensation heat transfer of CO_2 on Cu based hierarchical and nanostructured surfaces

机译：CO_2对Cu基等级和纳米结构表面的冷凝传热

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摘要

Phase-change processes such as condensation are efficient means of heat transfer. However, condensation is also an energy-intensive process and extensive research is conducted to increase the heat transfer efficiency. Increasing the effective heat transfer area in terms of surface structures on macro or microscale is one such technique of heat transfer enhancement. In this work, we have studied micro- and nanostructured surfaces for their potentials in increasing heat transfer during condensation of CO_2. Three Cu-based surfaces on which CuO nanoneedles have been grown, have been investigated. We hypothesize three competing mechanisms govern the overall heat transfer on structured surfaces: (1) increased heat transfer area, (2) lower thermal conductivity of oxides, and (3) condensate flooding of the structures. Our study has shown that in some cases, the effect of these mechanisms can be neutralized. More importantly, the results show that superior heat transfer can be achieved by optimizing the surface structure. The best of the structured surfaces resulted in a heat transfer coefficient 66% higher than that of the unstructured surface.
机译：相变过程，例如冷凝是有效的传热方法。然而，冷凝也是一种能量密集的过程，进行广泛的研究以增加传热效率。在宏观或微观上的表面结构方面增加有效传热区域是一种传热增强技术。在这项工作中，我们已经研究了微型和纳米结构表面，以便它们在CO_2缩合期间增加热传递的电位。已经研究了三种基于CuO纳尼的Cu基表面。我们假设三种竞争机制控制结构表面上的整体传热：（1）增加传热面积，（2）氧化物的导热系数，（3）凝结水分的渗出。我们的研究表明，在某些情况下，可以中和这些机制的效果。更重要的是，结果表明，通过优化表面结构，可以实现优异的传热。结构化表面的最佳导致传热系数比非结构化表面的热传递系数66％高。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第8期|121367.1-121367.9|共9页
  • 作者

    Ingrid Snustad; Lene Hollund; Asmund Ervik; Anders Austegard; Amy Brunsvold; Jianying He; Zhiliang Zhang;

  • 作者单位

    Faculty of Engineering Department of Structural Engineering Norwegian University of Science and Technology Richard Birkelands vei 1A Trondheim 7491 Norway;

    Faculty of Engineering Department of Structural Engineering Norwegian University of Science and Technology Richard Birkelands vei 1A Trondheim 7491 Norway;

    SINTEF Energy Research Sem æ lands vei 17 Trondheim 7034 Norway;

    SINTEF Energy Research Sem æ lands vei 17 Trondheim 7034 Norway;

    SINTEF Energy Research Sem æ lands vei 17 Trondheim 7034 Norway;

    Faculty of Engineering Department of Structural Engineering Norwegian University of Science and Technology Richard Birkelands vei 1A Trondheim 7491 Norway;

    Faculty of Engineering Department of Structural Engineering Norwegian University of Science and Technology Richard Birkelands vei 1A Trondheim 7491 Norway;

  • 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

    Condensation heat transfer; CO_2 liquefaction; Micro- and nanostructured surfaces; Cu based surfaces;

    机译：冷凝传热;CO_2液化;微型和纳米结构;CU基表面;

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