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1.河南理工大学机械与动力工程学院 焦作 454000
2.哈密豫新能源产业研究院有限责任公司 哈密 839000
Zheng Haikun, male, lecturer, College of Mechanical and Power Engineering, Henan Polytechnic University, 86-18810344608, E-mail: hkzheng@hpu.edu.cn. Research fields: the application of ice/frost formation and ice/frost suppression, enhanced heat transfer, refrigeration, and low-temperature technology in the fields of industrial, commercial refrigeration, and aerospace.
Received:28 November 2023,
Revised:22 December 2023,
Accepted:2024-02-05,
Published:16 April 2025
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Chen Xiaosong, Zheng Haikun, Zhang Peicheng, et al. Kinetic Behavior of Droplet Impacts on Inclined Surfaces with Different Wettability at Different Temperatures[J]. Journal of refrigeration, 2025, 46(2): 137-144.
Chen Xiaosong, Zheng Haikun, Zhang Peicheng, et al. Kinetic Behavior of Droplet Impacts on Inclined Surfaces with Different Wettability at Different Temperatures[J]. Journal of refrigeration, 2025, 46(2): 137-144. DOI: 10.12465/j.issn.0253-4339.2025.02.137.
超疏水表面作为一种新型绿色材料在防/除冰领域展现了一定的应用前景。通过实验对比研究了不同温度(-25~16 ℃)、不同倾角(0~60°)以及不同润湿性表面(亲水、超疏水表面)上撞击液滴的动力学行为,分析了其液滴形态、铺展因子、铺展时间和接触时间的变化情况。结果表明:由于倾角和润湿性不同,撞击液滴在铺展之后表现出不同的动力学行为;随着倾角增大,亲水表面最大铺展因子和铺展时间随之增大,超疏水表面铺展时间变化与之相同,最大铺展因子随着倾角的增加而减小,特别是
T
s
-25 ℃;相比于亲水表面,液滴撞击超疏水表面具有更短的铺展时间,在
T
s
=-25 ℃时可以达到约10倍;增大壁面倾角会打破液滴在水平超疏水表面上的对称反弹,进而缩短液滴接触时间,说明增加倾角可有效抑制水滴冻结。
Superhydrophobic surfaces
a new type of green material
exhibit promising application prospects in the field of anti-/de-icing. In this paper
the kinetic behavior of impinging droplets on surfaces with different temperatures (-25-16 ℃)
different inclination angles (0°-60°)
and different wettability (hydrophilic and superhydrophobic surfaces) is investigated through experimental comparisons. The variations of the droplet morphology
spreading factor
spreading time
and contact time are analyzed. The res
ults show that the impinging droplets exhibit different kinetic behaviors after spreading due to the different inclination angles and wettability. The maximum spreading factor and spreading time on hydrophilic surfaces increase with the inclination angle. The variation of the spreading time on superhydrophobic surfaces follows the same trend as that on hydrophilic surfaces
while the maximum spreading factor decreases with an increase in the inclination angle
especially at
T
s
-25 ℃; Compared to hydrophilic surfaces
the impinging droplets have shorter spreading times on superhydrophobic surfaces
which can reach about 10 times at
T
s
=-25 ℃. Increasing the wall inclination angle breaks the symmetric bounce of the droplets on the horizontal superhydrophobic surface
thereby shortening the contact time of the droplets. This suggests that increasing the inclination angle can effectively inhibit the freezing of water droplets.
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