Microtube Surfaces for the Simultaneous Enhancement of Efficiency and Critical Heat Flux during Pool Boiling
Name
Microtube Surfaces for Simultaneous Enhancement of Efficiency and Critical Heat Flux during Pool Boiling.pdf
Description
Accepted version
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993.21 KB
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Checksum (MD5)
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Author(s)
Song, Youngsup
Gong, Shuai
Vaartstra, Geoffrey
Wang, Evelyn N
Date Issued
2021
Journal
ACS Applied Materials & Interfaces
Publisher
American Chemical Society (ACS)
Citation
Song, Youngsup, Gong, Shuai, Vaartstra, Geoffrey and Wang, Evelyn N. 2021. "Microtube Surfaces for the Simultaneous Enhancement of Efficiency and Critical Heat Flux during Pool Boiling." ACS Applied Materials & Interfaces, 13 (10).
Version
Author's final manuscript
Abstract
Boiling is an essential process in numerous applications including power plants, thermal management, water purification, and steam generation. Previous studies have shown that surfaces with microcavities or biphilic wettability can enhance the efficiency of boiling heat transfer, that is, the heat transfer coefficient (HTC). Surfaces with permeable structures such as micropillar arrays, in contrast, have shown significant enhancement of the critical heat flux (CHF). In this work, we investigated microtube structures, where a cavity is defined at the center of a pillar, as structural building blocks to enhance HTC and CHF simultaneously in a controllable manner. We demonstrated simultaneous CHF and HTC enhancements of up to 62 and 244%, respectively, compared to those of a smooth surface. The experimental data along with high-speed images elucidate the mechanism for simultaneous enhancement where bubble nucleation occurs in the microtube cavities for increased HTC and microlayer evaporation occurs around microtube sidewalls for increased CHF. Furthermore, we combined micropillars and microtubes to create surfaces that further increased CHF by achieving a path to separate nucleating bubbles and rewetting liquids. This work provides guidelines for the systematic surface design for boiling heat transfer enhancement and has important implications for understanding boiling heat transfer mechanisms.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1021/ACSAMI.1C00750
