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Dropwise condensation on bioinspired hydrophilic-slippery surface.

L Guo1, G H Tang1

  • 1MOE Key Laboratory of Thermo-Fluid Science and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University Xi'an 710049 P. R. China ghtang@mail.xjtu.edu.cn +86-29-82665445 +86-29-82665319.

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|May 13, 2022
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This study introduces a novel hydrophilic-slippery surface that enhances water vapor condensation efficiency. It achieves high nucleation and droplet departure, even with non-condensable gases, improving heat transfer.

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Area of Science:

  • Materials Science
  • Surface Science
  • Thermodynamics

Background:

  • Efficient water vapor condensation requires high nucleation rates and effective droplet departure.
  • Superhydrophobic surfaces excel at droplet departure but have low nucleation rates.
  • Hydrophilic surfaces promote nucleation but hinder droplet departure.

Purpose of the Study:

  • To develop a surface combining hydrophilic nucleation and droplet mobility for enhanced condensation.
  • To investigate the performance of a novel copper-based hydrophilic-slippery surface.
  • To assess the impact of non-condensable gases on condensation efficiency.

Main Methods:

  • Fabrication of a microstructured copper substrate coated with trimethoxysilane lubricant.
  • Characterization of surface properties, including water contact and sliding angles.
  • Experimental evaluation of dropwise condensation efficiency with and without non-condensable gases.

Main Results:

  • The hydrophilic-slippery surface exhibited both low contact angles and low sliding angles.
  • Stable dropwise condensation was achieved, outperforming superhydrophobic and hydrophobic surfaces in droplet mobility.
  • Enhanced nucleation was observed due to surface hydrophilicity, particularly beneficial with non-condensable gases.

Conclusions:

  • The developed hydrophilic-slippery surface effectively combines nucleation and droplet departure for improved condensation heat transfer.
  • This surface design shows significant potential for applications involving phase change, especially in the presence of non-condensable gases.
  • The findings advance the design principles for functional surfaces in phase change, anti-icing, self-cleaning, and anti-fouling applications.