scholarly journals Condensation heat transfer on superhydrophobic surfaces

MRS Bulletin ◽  
2013 ◽  
Vol 38 (5) ◽  
pp. 397-406 ◽  
Author(s):  
Nenad Miljkovic ◽  
Evelyn N. Wang
Keyword(s):  
Heat Transfer ◽  
Condensation Heat Transfer ◽  
Superhydrophobic Surfaces ◽  
Image Position

Abstract

Condensation heat transfer on two-tier superhydrophobic surfaces

2012 ◽  
Vol 101 (13) ◽  
pp. 131909 ◽  
Author(s):  
Jiangtao Cheng ◽  
Aref Vandadi ◽  
Chung-Lung Chen
Keyword(s):  
Heat Transfer ◽  
Condensation Heat Transfer ◽  
Superhydrophobic Surfaces

scholarly journals Vibration-enhanced condensation heat transfer on superhydrophobic surfaces: An experimental study

AIP Advances ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 095123
Author(s):  
Mostafa Moradi ◽  
Seyed Farshid Chini ◽  
Mohammad Hassan Rahimian
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Condensation Heat Transfer ◽  
Superhydrophobic Surfaces

Condensation Heat Transfer on Two-Tier Superhydrophobic Surfaces

2012 ◽  
Author(s):  
Jiangtao Cheng ◽  
Aref Vandadi ◽  
Chung-Lung Chen
Keyword(s):  
Heat Transfer ◽  
Hydrophobic Surface ◽  
High Heat ◽  
Condensation Heat Transfer ◽  
Superhydrophobic Surfaces ◽  
Environmental Scanning ◽  
High Heat Flux ◽  
Textured Surface ◽  
Wenzel State ◽  
Moisture Condensation

Superhydrophobic surfaces exhibit large contact angle (> 150°) and small hysteresis (< 5°) which facilitate liquid transport and are expected to enhance condensation heat transfer on the surfaces. By growing short carbon nanotubes (CNTs) on an array of microposts etched on a silicon wafer, we formed a two-tier multiscale texture mimicking the surface structure of lotus leaves. Compared to one-tier microtexture which energetically favors the Wenzel state, the two-tier texture with micro/nano-scale roughness favors the Cassie state, the desired superhydrophobic state. Using an environmental scanning electron microscope (ESEM), we investigated moisture condensation on the fluoropolymer-coated two-tier texture and we have observed continuous dropwise condensation on the engineered superhydrophobic surface. However, in a customer-designed vapor chamber our condensation measurements indicate that a film layer of condensate in Wenzel state was formed on the textured surface. In particular, due to the filmwise condensation, the condensation heat transfer coefficient of the lotus-leaf-like surface is lower than that of a smooth hydrophobic surface especially under high heat flux situations.

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