Effect of attack angles on droplet impact on textured metal surfaces: Droplet morphisms, surface tilt angles, droplet deformation

• Published in: Experimental thermal and fluid science Vol. 150; p. 111062
• Main Authors: Voytkova, K.A., Syrodoy, S.V., Kostoreva, Zh.A.
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.01.2024
• Subjects: TDA; RCA; CD; HFE; FPS; CPU; LCA; CA; We
• ISSN: 0894-1777; 1879-2286
• DOI: 10.1016/j.expthermflusci.2023.111062

[Display omitted] •The shape of droplets was analyzed using topological based data analysis.•Bijections of the droplet both on non-tilted and on tilted substrates are equal.•The scratches orientation had a significant effect on the droplet dynamics.•The contact angles of the droplet did not depend on the tilt angle of the substrate. The experimental results of the water droplet impact on the tilted metal substrates are given. To establish the effect of the texture on the spreading of droplets, parallel-directed scratches were applied using a grinding machine. To analyze the shape of water droplets after impingement, topological-based data analysis (TDA) was used. The TDA showed that the droplet could be represented as a group of trivial topological structures: spheres, discs, and hemispheres. The latter creates the prerequisites for the development of relatively simple mathematical models that describe the complex processes of liquid droplets impacting on tilted, textured substrates. Moreover, the time dependence of the droplet contact line (L) and the left and right contact angles (LCA and RCA) on a textured surface were established. It was shown that anisotropic modification of the substrate has a significant effect on the characteristics and conditions of the spreading of the coolant droplets.