Visual Study of the Impact and Freezing Process of a Water Droplet on Carbon Fiber Plates

IF 1.3 4区工程技术 Q3 ENGINEERING, MECHANICAL Journal of Engineering Thermophysics Pub Date : 2023-12-14 DOI:10.1134/S1810232823040112

J. J. Tian, H. Y. Wang, S. Mehendale, Z. Zhang, C. X. Wu, X. D. Gu

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Abstract

The present study investigates the effects of droplet impact height, tilt angle, and surface temperature on the impact and freezing process of water droplet on a cold surface by using a Motionpro high-speed camera and a DSA-30 droplet surface analyzer. The temperature of the plate was changed from an ambient temperature of 24.0°C to \(-10.0^{\circ}\)C, while three impact heights (\(H\) = 100, 150 and 200 mm) were set. The data indicated that increasing impact height led to increase in the maximum spreading diameter and maximum endpoint displacement, but its effect on droplet spreading time was not significant. With decreasing the surface temperature, the rate of change in the droplet diameter was smoother and the droplet freezing time reduced. Moreover, at low Weber number (\(We < 200\)), the impact height has less effect on the freezing time of the droplet. Besides, compared with the horizontal plate, the droplet freezing time on plate tilted at 30° was higher for the same impact height.

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水滴对碳纤维板的冲击和冻结过程的视觉研究

摘要利用Motionpro高速摄像机和DSA-30液滴表面分析仪，研究了液滴撞击高度、倾斜角度和表面温度对液滴在低温表面上撞击和冻结过程的影响。将板的温度从环境温度24.0℃改变为\(-10.0^{\circ}\)℃，同时设置三个冲击高度\(H\) = 100、150和200 mm。数据表明，随着冲击高度的增加，液滴最大扩散直径和最大端点位移增加，但对液滴扩散时间的影响不显著。随着表面温度的降低，液滴直径的变化率更平稳，液滴冻结时间缩短。此外，在低韦伯数(\(We < 200\))时，撞击高度对液滴冻结时间的影响较小。此外，在相同的冲击高度下，与水平板相比，倾斜30°板上液滴冻结时间更长。

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来源期刊

Journal of Engineering Thermophysics THERMODYNAMICS-ENGINEERING, MECHANICAL

CiteScore

2.30

自引率

12.50%

发文量

审稿时长

3 months

期刊介绍： Journal of Engineering Thermophysics is an international peer reviewed journal that publishes original articles. The journal welcomes original articles on thermophysics from all countries in the English language. The journal focuses on experimental work, theory, analysis, and computational studies for better understanding of engineering and environmental aspects of thermophysics. The editorial board encourages the authors to submit papers with emphasis on new scientific aspects in experimental and visualization techniques, mathematical models of thermophysical process, energy, and environmental applications. Journal of Engineering Thermophysics covers all subject matter related to thermophysics, including heat and mass transfer, multiphase flow, conduction, radiation, combustion, thermo-gas dynamics, rarefied gas flow, environmental protection in power engineering, and many others.