Drop impact phenomena and spray cooling on hot nanotextured surfaces of various architectures and dynamic wettability

被引:29
作者
Park, Chanwoo [1 ]
Seol, Jaewoo [1 ]
Aldalbahi, Ali [2 ]
Rahaman, Mostafizur [2 ]
Yarin, Alexander L. L. [1 ,3 ]
Yoon, Sam S. S. [1 ]
机构
[1] Korea Univ, Sch Mech Engn, Seoul 02841, South Korea
[2] King Saud Univ, Coll Sci, Dept Chem, Riyadh 11451, Saudi Arabia
[3] Univ Illinois, Dept Mech & Ind Engn, Chicago, IL 60607 USA
基金
新加坡国家研究基金会;
关键词
HEAT-TRANSFER; BOILING REGIMES; TRANSPARENT; IMPINGEMENT; ENHANCEMENT; PENETRATION; DISC;
D O I
10.1063/5.0139960
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
Spray cooling has been used to quench metal slabs during casting, cool nuclear reactors, suppress accidental fires, and remove heat from high-power density electronics. In particular, the miniaturization of electronic devices inevitably results in an increased power density or heat flux on the microelectronics surfaces and poses a threat of a thermal shutdown of such devices when cooling is insufficient. Surface nanotexturing effectively augments additional liquid-to-substrate surface area, thereby increasing cooling capability, as well as an effective heat transfer coefficient. In spray cooling, surface dynamic wettability also affects drop impact dynamics and subsequent coolant evaporation on a hot surface. Herein, we introduced various nanotextured surfaces and affected dynamic wettability using the so-called thorny-devil nanofibers, nickel nanocones, Teflon and titania nanoparticles, and zinc nanowires. The effect of these different nanoscale architectures on drop impact phenomena and subsequent evaporative cooling was investigated. These nanotextured surfaces were fabricated using various deposition methods, including electrospinning, electroplating, supersonic spraying, aerosol deposition, and chemical bath deposition. We found that the surface with greater dynamic wettability related to the hydrodynamic focusing considerably improved the heat removal capability by furthering the Leidenfrost limit and facilitating drop spreading. In particular, the thorny-devil nanofiber surface yielded the highest heat flux at all ranges of the Reynolds and Weber numbers. Spray cooling on a model electronic kit also confirmed that the thorny-devil nanofibers were most effective in cooling the surface of the model kit during multiple cycles of water spraying.
引用
收藏
页数:12
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