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Condensation heat transfer characteristics of moist air outside 3-D finned tubes with different wettability

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  • Gu, Yuheng
  • Ding, Yudong
  • Liao, Qiang
  • Fu, Qian
  • Zhu, Xun
  • Wang, Hong

Abstract

The condensation heat transfer of moist air plays an important role in industries and daily life. However, the presence of non-condensable gases makes it difficult for steam to condensate on a cooling surface. According to previous studies, a three-dimensional (3-D) finned tube and dropwise condensation can both increase the heat transfer performance. To increase the condensation heat transfer of moist air, this study combined these two methods and experimentally studied the condensation heat transfer of moist air outside 3-D finned tubes with different wettability values. The effects of the 3-D fins and surface wettability on the heat transfer process under different steam mole fractions, moist air temperatures, and cooling water inlet temperatures were determined and analysed in detail. The experimental results showed that a hydrophilic 3-D finned tube could achieve the highest heat transfer coefficient, which was up to 94% higher than that of a hydrophilic smooth tube. In addition, the heat flux and heat transfer coefficient increased with decreases in the moist air temperature and cooling water inlet temperature, or with an increase in the steam mole fraction. Droplet retained between 3-D fins increased the diffusion resistance of water steam and the conductive thermal resistance.

Suggested Citation

  • Gu, Yuheng & Ding, Yudong & Liao, Qiang & Fu, Qian & Zhu, Xun & Wang, Hong, 2020. "Condensation heat transfer characteristics of moist air outside 3-D finned tubes with different wettability," Energy, Elsevier, vol. 207(C).
    • Handle: RePEc:eee:energy:v:207:y:2020:i:c:s0360544220313098
    DOI: 10.1016/j.energy.2020.118202
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    References listed on IDEAS

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    1. Siavashi, Javad & Mahdaviara, Mehdi & Shojaei, Mohammad Javad & Sharifi, Mohammad & Blunt, Martin J., 2024. "Segmentation of two-phase flow X-ray tomography images to determine contact angle using deep autoencoders," Energy, Elsevier, vol. 288(C).
    2. Ding, Yudong & Zhang, Wenhe & Deng, Bin & Gu, Yuheng & Liao, Qiang & Long, Zhenze & Zhu, Xun, 2022. "Experimental and numerical investigation on natural convection heat transfer characteristics of vertical 3-D externally finned tubes," Energy, Elsevier, vol. 239(PB).
    3. Yu Gao & Hong Cheng & Wei Li & David John Kukulka & Rick Smith, 2022. "Condensation Flow and Heat Transfer Characteristics of R410A in Micro-Fin Tubes and Three-Dimensional Surface Enhanced Tubes," Energies, MDPI, vol. 15(8), pages 1-20, April.
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