期刊
PHYSICS OF FLUIDS
卷 31, 期 4, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.5090909
关键词
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资金
- National Natural Science Foundation of China [11604030, 11674043]
- Fundamental Research Funds for the Central Universities [106112017CDJXY300001, 2018CDJDWL0011]
In this study, we examined the impacts of a millimeter sized water drop hitting a layer of uniformly distributed particles on a hydrophilic/hydrophobic glass slide. A ring/disc structure without particles was formed and modified by two mechanisms: pushout and pullback. The pushout factor dominated the process when the drop hit on the hydrophilic glass slide, while the pullback factor played a decisive role during impact on the hydrophobic surface. The rebound of a drop on the hydrophobic surface formed a disc-shaped ring. We showed that the ratio of the effects of these two factors on the ring/disc width were independent from the impact speed, in both experimental and scaling analyses. Our results also suggested that higher hydrophobicity of a water drop on the hydrophobic glass slide, instead of a polymethyl methacrylate (PMMA) particle surface, resulted in a lower maximum spreading distance when the drop hit the PMMA particle layer on a hydrophobic surface. Published under license by AIP Publishing.
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