A highly ordered nanotubes-surface was prepared on the surface of smooth titanium plates by anodic oxidation. The morphologies and the characteristics of nanotubes-surface and smooth surface were characterized by SEM, atomic force microscopy (AFM) and automatic contact angle measuring instrument. The preparation of self-wetting solution and the corresponding thermophysical determination were realized. The heat transfer performances of different surfaces (smooth surface and nanotubes-surface) coupled to different working fluids (distilled water and self-wetting solution) were investigated by the pool boiling experiment, making the comparation and analysis from different angles for the heat transfer effect using the distinct combination of conditions. At the same time, the mechanism of heat transfer enhancement between the nanotubes-surface and the self-wetting solution had been analyzed in micro and macro. The results showed that when the nanotubes-surface with super hydrophilicity and greater roughness was coupled with the self-wetting solution, the maximum heat transfer coefficient and critical heat flux can be as high as 11.963 kW/(m2?℃) and 623.706 kW/m2, respectively, which increased by 84.1% and 143.8% compared to the conventional smooth surface and distilled water coupling. The effects of the maximum heat transfer coefficient and critical heat flux enhancement to the heat transfer systems were slightly different between the nanotubes-surface and self-wetting solution, showing characteristics in coordination and enhancement of the boiling heat transfer performance. The nanotubes-surface had more effective vaporization core and better wettability. Combined with the special surface tension characteristics of self-wetting solution, the cold and hot liquid microcirculation was formed, which would facilitate the movement of hot and cold liquids, the secondary wetting in time, the drastic reduction in bubble diameter and the increasement in departure frequency, microbubbles appeared, increased system disturbances, effectively enhanced heat transfer performance. It was the main mechanism to increase the system's maximum heat transfer coefficient and critical heat flux density.
Xianghua SI Baisong HU Shaofeng ZHANG Dewu WANG Weiming YU
. Heat transfer characteristics of self-wetting solution and nanotube surface[J]. The Chinese Journal of Process Engineering, 2019
, 19(1)
: 73
-82
.
DOI: 10.12034/j.issn.1009-606X.218131
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