The influence of Wettability on the Droplet Impact onto Micro-Structured Surfaces (original) (raw)
International Conference on Liquid Atomization and Spray Systems (ICLASS)
The flourishing of applications in need of self-cleaning mechanisms increased the search for water repellent hydrophobic surfaces with induced roughness. Disclosing the small-scale interface phenomena on the wetting behavior is essential to design efficient hydrophobic materials with defined topography. On the other hand, the spreading behavior concerning the formation of thin films on a surface is required to assure the quality of spray cooling and coatings. The contact angle undoubtedly plays an important role in the droplet impact, providing different outcomes. Moreover, an open question is, how surface topography can affect the impact process. Therefore, to evaluate these matters, different surface patterns were manufactured to assess the surface topography influence on the impact dynamic behavior. Additionally, the wettability of the micro-structured surfaces was flexibly influenced through plasma activation and plasma polymerization. The impact of distilled water and isopropanol droplets on the different surface patterns was captured from three perspectives providing high-quality images of the phenomena. Different surface morphologies can be obtained depending on the surface micro-structures and wettability, affecting spreading shape and evolution. The fluid penetration within the micro-structures is a key feature influencing not only the structures of the outcomes but also the transition between regimes.
Loading Preview
Sorry, preview is currently unavailable. You can download the paper by clicking the button above.