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research-article

On temporal biphilicity: definition, relevance and technical implementation in boiling heat transfer.

[+] Author and Article Information
Christophe Frankiewicz

Iowa State University Mechanical Engineering, Iowa State University, Ames, IA, 50011, USA
franki@iastate.edu

Daniel Attinger

Iowa State University Mechanical Engineering, Iowa State University, Ames, IA, 50011, USA
attinger@iastate.edu

1Corresponding author.

ASME doi:10.1115/1.4037162 History: Received August 01, 2016; Revised June 23, 2017

Abstract

Solid-fluid interfaces switching from a superhydrophilic to a superhydrophobic wetting state are desired for their ability to control and enhance phase change heat transfer. Typically, these functional surfaces are fabricated from polymers and modify their chemistry or texture upon the application of a stimulus. For integration in relevant phase change heat transfer applications, several challenges need to be overcome, of chemical stability, mechanical and thermal robustness, as well as large scale manufacturing. Here, we describe the design and fabrication of metallic surfaces that reversibly switch between hydrophilic and superhydrophobic states, in response to pressure and temperature stimuli. Characterization of the surfaces in pool boiling experiments verifies their thermal and mechanical robustness, and the fabrication method is scalable to large areas. During pool boiling experiments, it is experimentally demonstrated that the functional surfaces can be actively switched between a high-efficiency mode suitable for low heat fluxes, and a high-power mode suitable for high heat flux applications.

Copyright (c) 2017 by ASME
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