Experimental Study of Droplet Impact on Superhydrophobic Surface at Different Speeds
DOI:
https://doi.org/10.54097/tdwrky95Keywords:
Superhydrophobic surface, droplet impact, microstructure spacing, wetting state, contact timeAbstract
The formation of ice caused by droplets hitting the cold surface may adversely affect the operation of various mechanical devices, causing a series of safety hazards. The surface modification with superhydrophobic properties effectively reduces the contact time and the heat exchange between the contact droplets and the cold surface, promotes the rapid shedding of droplets, and reduces the damage caused by the formation of ice layer. However, the research on the dynamics and heat transfer process of the effect of droplets on low-temperature superhydrophobic surfaces is still limited. The dynamic process of droplets with different Weber numbers impacting on different normal temperature surfaces was studied by using the prepared sample surface F1 ~ F5 and the visual droplet impact test bench. The experimental results show that the droplet spreading stage shows different dynamic characteristics with the change of droplet velocity and surface microstructure spacing. The microstructure spacing has little effect on the dynamic state of the impact droplet rebound with low Weber number, and mainly affects the dynamic state of the impact droplet rebound with high Weber number. The droplet spreading factor increases first and then decreases with the impact time, and is not affected by the surface microstructure spacing at lower Weber numbers. With the increase of Weber number and surface microstructure spacing, the variation curve of droplet spreading factor in the retraction stage will be different. The maximum spreading factor of the droplet is directly affected by the Weber number, and there is a certain fitting relationship with the Weber number: max=We1/4. The increase of surface microstructure spacing under high Weber number will make the change trend of max deviate from the fitting curve. Under the same surface, the droplet contact time Tc basically decreases with the increase of Weber number, while under the same Weber number, the change of microstructure spacing will cause the change of wetting state, so the droplet contact time basically decreases first and then increases. Through energy analysis and statistics of the first rebound height of droplets, it is shown that with the change of Weber number and surface microstructure spacing, the change of droplet rebound height is opposite to the change trend of contact time. However, when Weber number is greater than a certain value, the change trend of droplet rebound height is no longer corresponding to the change trend of droplet contact time, and the rebound height is generally reduced.
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