Visualization of Boiling Heat Transfer on Copper Surface with Different Wettability

LIU Dong, LI Yunheng, HU Anjie

热科学学报 ›› 2022, Vol. 31 ›› Issue (6) : 1903-1913.

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热科学学报 ›› 2022, Vol. 31 ›› Issue (6) : 1903-1913. DOI: 10.1007/s11630-022-1599-4  CSTR: 32141.14.JTS-022-1599-4

Visualization of Boiling Heat Transfer on Copper Surface with Different Wettability

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Visualization of Boiling Heat Transfer on Copper Surface with Different Wettability

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摘要

为研究润湿性对核沸腾传热的影响,建立了池沸腾可视化实验平台,采用化学蚀刻法制备铜表面,得到了亲水、疏水、光滑三种类型的铜表面,通过高速摄像仪记录了单个和多个气泡的动力学行为,研究了沸腾换热的机理。实验得到的传热曲线和传热系数(HTC)曲线表明:当沸腾换热接近临界热流密度(CHF)时,HTC仍然持续增大,难以反映高过热度下的换热恶化。为综合评价沸腾换热效率,提出了单位过热度热流增长速率的概念。进一步结合传热曲线和气泡动力学行为,对不同润湿表面沸腾换热特点进行了研究,结果表明: 低热流密度时,表面气泡覆盖传热为主,疏水表面的沸腾换热效率高于亲水表面;随着热流密度的增加,连接大气泡和壁面的蒸汽通道对强化传热起着重要作用;疏水表面的气泡聚合易形成气泡膜,破坏了蒸汽通道,导致HTC明显小于亲水表面,CHF明显低于亲水表面;亲水表面的HTC可达54.85 kW·m-2·K-1,是疏水表面的2.3倍。

Abstract

In this work, a pool boiling visualization experiment platform was built to study the influence of wettability on the nucleate boiling heat transfer. The copper surface was prepared by chemical etching method, and three types of copper surfaces (hydrophilic, hydrophobic, and smooth) were obtained. The boiling heat transfer characteristics of these three surfaces were discussed based on the obtained heat transfer curves and the heat transfer coefficient (HTC) curves. It was found that the HTC still increases when the boiling heat transfer closes the critical heat flux (CHF). To better evaluate the boiling heat transfer efficiency, the concept of heat flux growth rate per unit superheat is introduced. The dynamic behaviors of single and multiple bubbles were also recorded to study the mechanism of the boiling heat transfer. The bubble behavior characteristics show good consistent with the proposed heat flux growth rate. By comparing the heat transfer curves and the bubble dynamic behavior, the following characters of boiling heat exchange can be found: At low heat flux, the heat exchange is dominated by the bubble coverage on the surface, and the hydrophobic surface has better boiling heat transfer efficiency than the hydrophilic surface. As the heat flux increases, the vapor channel connecting a big bubble and the wall surface plays an important role in enhancing the heat transfer. The polymerization of bubbles on the hydrophobic surface forms bubble films and breaks the vapor channel, leading to a significantly smaller HTC and a lower CHF than that of the hydrophilic surface. The HTC of hydrophilic surface in this work can reach up to 54.85 kW/(m2·K), which is 2.3 times the hydrophobic surface.

关键词

boiling heat transfer / boiling curve / bubble dynamic

Key words

boiling heat transfer / boiling curve / bubble dynamic

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导出引用
LIU Dong , LI Yunheng , HU Anjie. Visualization of Boiling Heat Transfer on Copper Surface with Different Wettability[J]. 热科学学报, 2022, 31(6): 1903-1913 https://doi.org/10.1007/s11630-022-1599-4
LIU Dong , LI Yunheng , HU Anjie. Visualization of Boiling Heat Transfer on Copper Surface with Different Wettability[J]. Journal of Thermal Science, 2022, 31(6): 1903-1913 https://doi.org/10.1007/s11630-022-1599-4

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基金

This work is sponsored by the National Natural Science Foundation of China (51606159) and Open Fund of Key Laboratory of Icing and Anti/De-icing (Grant No. IADL20190311).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022
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