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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect of layer-by-layer assembled carbon nanotube coatings on dropwise condensation heat transfer associated with non-condensable gas effect
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Effect of layer-by-layer assembled carbon nanotube coatings on dropwise condensation heat transfer associated with non-condensable gas effect

机译：逐层组装碳纳米管涂层对与不可冷凝气体效应相关的滴加传热的影响

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摘要

The purpose of this study is to investigate the effect of layer-by-layer (LbL) assembled carbon nanotube (CNT) coatings on dropwise condensation heat transfer under steam-air mixture conditions. To promote dropwise condensation, an additional hydrophobic coating was added to the LbL-assembled CNT coatings, which resulted in a 16% enhanced condensation heat transfer coefficient (HTC) compared to that of the bare surface under saturated steam conditions. Despite the existence of the nanostructures on the CNT-layered surface, the larger droplet size was observed from the high-speed images than that of the bare surface due to flooding condensation phenomenon. Considering that the HTC was enhanced without smaller droplet size, it is evident that this enhancement was mainly attributed to the reduced constriction resistance driven by the high thermal conductivity of the CNT layers. A new HTC model for dropwise condensation incorporating constriction resistance was developed to better predict the measured condensation HTC. Although the enhancement of the condensation HTC on the LbL-assembled CNT coatings was diminished with the air mass fraction, this work reports a new perspective to enhance the dropwise condensation heat transfer performance by controlling the constriction resistance using a highly thermally conductive coating.
机译：本研究的目的是研究逐层（LBL）组装碳纳米管（CNT）涂层对蒸汽空气混合物条件下滴缩热传递的影响。为了促进滴缩，将另外的疏水涂层加入到LBL组装的CNT涂层中，与饱和蒸汽条件下的裸表面相比，导致16％增强的缩合传热系数（HTC）。尽管在CNT层表面上存在纳米结构，但由于泛滥的冷凝现象，从高速图像观察到较大的液滴尺寸。考虑到HTC的增强而没有较小的液滴尺寸，显然该增强主要归因于由CNT层的高导热率驱动的降低的收缩阻力。开发了一种新的HTC模型，用于加入收缩抗性的滴加缩合，以更好地预测测量的冷凝HTC。尽管通过空气质量分数降低了LBL组装的CNT涂层上的冷凝HTC的增强，但是通过使用高度导热涂层控制收缩阻力来提高滴加冷热性能的新视角。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第8期|121345.1-121345.15|共15页
  • 作者

    Taeseok Kim; Doyoung Shin; Jaemin Lee; Sung Joong Kim;

  • 作者单位

    Department of Nuclear Engineering Hanyang University 222 Wangsimni-ro Seongdong-gu Seoul 04763 Republic of Korea;

    Department of Nuclear Engineering Hanyang University 222 Wangsimni-ro Seongdong-gu Seoul 04763 Republic of Korea;

    School of Mechanical Engineering Korea University 145 Anam-ro Seongbuk-gu Seoul 02841 Republic of Korea;

    Department of Nuclear Engineering Hanyang University 222 Wangsimni-ro Seongdong-gu Seoul 04763 Republic of Korea Institute of Nano Science & Technology Hanyang University 222 Wangsimni-ro Seongdong-gu Seoul 04763 Republic of Korea;

  • 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

    dropwise condensation; condensation heat transfer; carbon nanotube; constriction resistance; non-condensable gas;

    机译：滴凝;冷凝传热;碳纳米管;收缩抵抗;不可凝聚的气体;

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