Retraction and Adhesion of a Single Droplet Normal Impact on the Solid Surface

The impact behavior of individual biomass oil droplets was investigated on solid surfaces having different structures (flat, cylindrical, and spherical) using the high-speed video technique. This makes it possible to compare the evolution of the droplet impact on various surface structures. The impa...

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Bibliographic Details
Published in:Fluid dynamics 2021-12, Vol.56 (Suppl 1), p.S19-S33
Main Authors: Chen, X. X., Shi, Z. Y., Wang, G. Q., Zheng, E. H., Tang, P. B., Xu, J. R.
Format: Article
Language:English
Subjects:
Adhesion
Behavior
Biomass
Classical and Continuum Physics
Classical Mechanics
Contact angle
Diameters
Droplets
Engineering Fluid Dynamics
Flat surfaces
Fluid- and Aerodynamics
Hydrophobic surfaces
Hydrophobicity
Physics
Physics and Astronomy
Solid surfaces
Surface structure
Surface tension
Thickness
Weber number
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Summary:The impact behavior of individual biomass oil droplets was investigated on solid surfaces having different structures (flat, cylindrical, and spherical) using the high-speed video technique. This makes it possible to compare the evolution of the droplet impact on various surface structures. The impact behaviors of retraction–oscillation and adhesion are analyzed for different hydrophobic surfaces. The influence of the Weber number (We), the surface structure, and the surface curvature is further examined by focusing on the retraction and stable adhesion (thickness, adhesion, and contact angle) for different biomass oil droplets. The results show that the retraction factor gradually increases as We increases to some critical value, beyond which the increase rate slows down or the retraction factor begins to decrease. The largest retraction factor is observed on the flat surface and the smallest one appears on the spherical surface. The adhesion thickness of the liquid film oscillates periodically over time, and its oscillation amplitude gradually decreases with a constant frequency, which is smaller for the more hydrophobic surfaces. The curvatures of the cylinder and sphere have little influence on the stable adhesion behavior. For the different droplet types, the adhesion diameter on the flat surface gradually increases as We rises, whereas the adhesion thickness gradually decreases with increase in We. These results are helpful for understanding the impact behaviors of biomass oil droplets with high viscosity and small surface tension on solid surfaces.
ISSN:0015-4628
1573-8507
DOI:10.1134/S0015462822020033