TY - JOUR
T1 - Liquid-Infused Smooth Surface for Improved Condensation Heat Transfer
AU - Tsuchiya, Hirotaka
AU - Tenjimbayashi, Mizuki
AU - Moriya, Takeo
AU - Yoshikawa, Ryohei
AU - Sasaki, Kaichi
AU - Togasawa, Ryo
AU - Yamazaki, Taku
AU - Manabe, Kengo
AU - Shiratori, Seimei
N1 - Funding Information:
This work was supported by JSPS KAKENHI (Grant No. JP16J06070). We are deeply grateful to Dr. Yoshio Hotta and Dr. Kyu-Hong Kyung, whose comments were valuable to our study. We very much appreciate the support from Dr. Kouji Fujimoto, whose meticulous comments were an enormous help. M.T. is thankful for a predoctoral fellowship (DC1) from Japan Society of Promotion of Science (JSPS).
Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/9/12
Y1 - 2017/9/12
N2 - 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.
AB - 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.
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U2 - 10.1021/acs.langmuir.7b01991
DO - 10.1021/acs.langmuir.7b01991
M3 - Article
C2 - 28826213
AN - SCOPUS:85029308984
SN - 0743-7463
VL - 33
SP - 8950
EP - 8960
JO - Langmuir
JF - Langmuir
IS - 36
ER -