scholarly journals Dynamic wetting and heat transfer during droplet impact on bi-phobic wettability-patterned surfaces

2020 ◽  
Vol 32 (6) ◽  
pp. 067110 ◽  
Author(s):  
Wenliang Qi ◽  
Patricia B. Weisensee
Keyword(s):  
Heat Transfer ◽  
Droplet Impact ◽  
Patterned Surfaces ◽  
Dynamic Wetting

scholarly journals Dynamic wetting of an occlusion after droplet impact

2019 ◽  
Vol 111 ◽  
pp. 264-271 ◽  
Author(s):  
Hossein Rashidian ◽  
Mathieu Sellier ◽  
Philippe Mandin
Keyword(s):  
Droplet Impact ◽  
Dynamic Wetting

Nucleate Boiling of Dielectric Liquids on Hydrophobic Patterned Surfaces

2014 ◽  
Author(s):  
Nihal E. Joshua ◽  
Denesh K. Ajakumar ◽  
Huseyin Bostanci
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Nucleate Boiling ◽  
High Heat ◽  
Copper Surface ◽  
Dielectric Liquid ◽  
Working Fluid ◽  
Patterned Surfaces ◽  
High Heat Flux ◽  
Dielectric Liquids

This study experimentally investigated the effect of hydrophobic patterned surfaces in nucleate boiling heat transfer. A dielectric liquid, HFE-7100, was used as the working fluid in the saturated boiling tests. Dielectric liquids are known to have highly-wetting characteristics. They tend to fill surface cavities that would normally trap vapor/gas, and serve as active nucleation sites during boiling. With the lack of these vapor filled cavities, boiling of a dielectric liquid leads to high incipience superheats and accompanying temperature overshoots. Heater samples in this study were prepared by applying a thin Teflon (AF400, Dupont) coating on 1-cm2 smooth copper surfaces following common photolithography techniques. Matching size thick film resistors, attached onto the copper samples, generated heat and simulated high heat flux electronic devices. Tests investigated the heater samples featuring circular pattern sizes between 40–100 μm, and corresponding pitch sizes between 80–200 μm. Additionally, a plain, smooth copper surface was tested to obtain reference data. Based on data, hydrophobic patterned surfaces effectively eliminated the temperature overshoot at boiling incipience, and considerably improved nucleate boiling performance in terms of heat transfer coefficient and critical heat flux over the reference surface. Hydrophobic patterned surfaces therefore demonstrated a practical surface modification method for heat transfer enhancement in immersion cooling applications.

Static and Dynamic Wetting Characteristics of Nano-patterned Surfaces

2008 ◽  
Vol 22 (15) ◽  
pp. 1931-1948 ◽  
Author(s):  
Paul M. Harder ◽  
Timothy A. Shedd ◽  
Matthew Colburn
Keyword(s):  
Patterned Surfaces ◽  
Dynamic Wetting

scholarly journals Enhancement of condensation heat transfer with patterned surfaces

2014 ◽  
Vol 71 ◽  
pp. 675-681 ◽  
Author(s):  
Abhra Chatterjee ◽  
Melanie M. Derby ◽  
Yoav Peles ◽  
Michael K. Jensen
Keyword(s):  
Heat Transfer ◽  
Condensation Heat Transfer ◽  
Patterned Surfaces
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