Boiling Heat Transfer Enhancement on Biphilic Surfaces

被引:6
|
作者
Chinnov, Evgeny A. [1 ]
Khmel, Sergey Ya [1 ]
Vladimirov, Victor Yu [1 ]
Safonov, Aleksey, I [1 ]
Semionov, Vitaliy V. [1 ]
Emelyanenko, Kirill A. [2 ]
Emelyanenko, Alexandre M. [2 ]
Boinovich, Ludmila B. [2 ]
机构
[1] Russian Acad Sci, Kutateladze Inst Thermophys, Siberian Branch, 1 Lavrentyev Ave, Novosibirsk 630090, Russia
[2] Russian Acad Sci, AN Frumkin Inst Phys Chem & Electrochem, Leninsky Prospect 31 Bldg 4, Moscow 119071, Russia
基金
俄罗斯科学基金会;
关键词
wettability; biphilic; surface modification; boiling; heat transfer enhancement; COATINGS; BEHAVIOR;
D O I
10.3390/en15197296
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Flat surfaces with different patterns of hydrophobic spots were employed for experimental investigation of boiling heat transfer. In one case, hydrophobic spots were created on a smooth copper surface and on a surface coated with arrays of micrococoons from silicon oxide nanowires by vapor deposition of a fluoropolymer. In the second case, a hydrophobic coating was deposited on heater surfaces with cavity microstructures formed by laser ablation and chemisorption of fluorinated methoxysilane. Water under saturation conditions at atmospheric pressure was used as the working liquid. The temperature of the heating surface was varied from 100 to 125 degrees C, and the maximum value of the heat flux was 160 W/cm(2). Boiling heat transfer on the test biphilic surfaces was significantly (up to 600%) higher than on non-biphilic surfaces. Surface texture, the shape of hydrophobic regions, and the method of their creation tested in this study did not show a significant effect on heat transfer. The boiling heat transfer rate was found to depend on the size of hydrophobic spots, the distance between them, and hence the number of spots. The highest heat transfer efficiency was detected for the surface with the largest number of hydrophobic spots. After long-term experiments (up to 3 years), the heat transfer coefficient on the obtained surfaces remained higher than on the smooth copper surface. Biphilic surfaces with arrays of cavities formed by laser ablation turned out to be the most stable during prolonged contact with boiling water.
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页数:19
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