Nano-Surface Heat Transfer Performance Based on Self-Wetting Solution

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Abstract Titanium dioxide nanotube arrays served as the heat exchange surface were prepared by anodic oxidation on titanium surface. The influences of the butanol concentration on the critical heat flux and heat transfer coefficient of the system were investigated with the self-wetting solutions containing different concentrations of butanol, and the coupled heat transfer mechanism was also analyzed. The experimental results showed that the critical heat flux was greatly increased by the coupled heat transfer between the titanium dioxide nanotube surface and the self-wetting solution compared with the conventional smooth surface and distilled water coupling, and the heat transfer coefficient decreased with the increase of the concentration of the self-wetting solution. When the nanotube surface with super hydrophilicity and greater roughness was coupled with the 1% self-wetting solution, the maximum heat transfer coefficient and critical heat flux can be as high as 11.963 kW·m^-2·℃^-1 and 623.706 kW·m^-2, respectively, which are increased by 84.1% and 143.8% compared with the conventional coupling. It is known from the bubble visualization that the bubbles produced by coupled heat transfer during the boiling process are small, quick to depart and not easy to reunite. The combined bubbles are easy to break and form the microbubbles, which makes the system enter a violent bubble boiling state. The high departure frequency of bubbles and special effective liquid replenishing paths are the main reason for improving the heat transfer coefficient and critical heat flux.

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	Articles by authors
	Hu Baisong
	Si Xianghua
	Wang Dewu
	Zhang Shaofeng
	Luo Mingyuan

Keywords： nanotubes surface； self-wetting solution； pool boiling； enhancement heat transfer； bubble

Received 2018-05-09;

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Hu Baisong, Si Xianghua, Wang Dewu, Zhang Shaofeng, Luo Mingyuan.Nano-Surface Heat Transfer Performance Based on Self-Wetting Solution[J] Chemcial Industry and Engineering, 2019,V36(3): 49-54

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