Liquid-Infused Smooth Surface for Improved Condensation Heat Transfer

Hirotaka Tsuchiya, Mizuki Tenjimbayashi, Takeo Moriya, Ryohei Yoshikawa, Kaichi Sasaki, Ryo Togasawa, Taku Yamazaki, Kengo Manabe, Seimei Shiratori

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Control of vapor condensation properties is a promising approach to manage a crucial part of energy infrastructure conditions. Heat transfer by vapor condensation on superhydrophobic coatings has garnered attention, because dropwise condensation on superhydrophobic surfaces with rough structures leads to favorable heat-transfer performance. However, pinned condensed water droplets within the rough structure and a high thermodynamic energy barrier for nucleation of superhydrophobic surfaces limit their heat-transfer increase. Recently, slippery liquid-infused surfaces (SLIPS) have been investigated, because of their high water sliding ability and surface smoothness originating from the liquid layer. However, even on SLIPS, condensed water droplets are eventually pinned to degrade their heat-transfer properties after extended use, because the rough base layer is exposed as infused liquid is lost. Herein, we report a liquid-infused smooth surface named "SPLASH" (surface with π electron interaction liquid adsorption, smoothness, and hydrophobicity) to overcome the problems derived from the rough structures in previous approaches to obtain stable, high heat-transfer performance. The SPLASH displayed a maximum condensation heat-transfer coefficient that was 175% higher than that of an uncoated substrate. The SPLASH also showed higher heat-transfer performance and more stable dropwise condensation than superhydrophobic surfaces and SLIPS from the viewpoints of condensed water droplet mobility and the thermodynamic energy barrier for nucleation. The effects of liquid-infused surface roughness and liquid viscosity on condensation heat transfer were investigated to compare heat-transfer performance. This research will aid industrial applications using vapor condensation.

Original languageEnglish
Pages (from-to)8950-8960
Number of pages11
JournalLangmuir
Volume33
Issue number36
DOIs
Publication statusPublished - 2017 Sep 12

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Tsuchiya, H., Tenjimbayashi, M., Moriya, T., Yoshikawa, R., Sasaki, K., Togasawa, R., Yamazaki, T., Manabe, K., & Shiratori, S. (2017). Liquid-Infused Smooth Surface for Improved Condensation Heat Transfer. Langmuir, 33(36), 8950-8960. https://doi.org/10.1021/acs.langmuir.7b01991