期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 10, 页码 12629-12635出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c00750
关键词
boiling; critical heat flux; heat transfer coefficient; phase change heat transfer; microsurfaces
资金
- Advanced Research Projects Agency-Energy (ARPA-E), U.S. Department of Energy [DE-AR0000ABC]
- National Natural Science Foundation of China [51706135]
- National Science and Technology Major Project [2018ZX06002004]
- Shanghai Pujiang Program [20PJ1406800]
- Air Force Office of Scientific Research [FA9550-19-1-0392]
Boiling is a fundamental process in many applications where surfaces with microcavities or biphilic wettability can enhance heat transfer efficiency. This study investigated microtube structures to simultaneously enhance heat transfer coefficient and critical heat flux, achieving significant improvements compared to smooth surfaces. The combination of micropillars and microtubes further increased critical heat flux by separating nucleating bubbles and rewetting liquids.
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.
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