Experimental and numerical simulation of dynamic characteristics on single drop impacting hydrophilic wires

• Published in: Case studies in thermal engineering Vol. 42; p. 102760
• Main Authors: Chen, Yadong, Yang, Yuxuan, Shi, Xiaoxiao, Zhang, Wenrui, Liu, Liansheng, Liu, Xuanchen
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.02.2023; Elsevier
• Subjects: Drop impact; Eccentricity; Flow dynamics; Hydrophilic wire; Weber number; Flow dynamics; Drop impact; Hydrophilic wire; Eccentricity; Weber number
• ISSN: 2214-157X; 2214-157X
• DOI: 10.1016/j.csite.2023.102760

The phenomenon that the drops impact the solid wall widely exists in industrial production. In this paper, the dynamic evolution of a single drop impacting a horizontal hydrophilic wire is explored through experiments and numerical simulation methods. Combined with the phenomena of spreading, retracting and breaking, the movement behavior law of the drop impacting the curved surface is analyzed. Furthermore, the effects of eccentricity, Weber number and wall wettability on drop impact spreading dynamics are studied. The results show that, with the increase of impact eccentricity, the drop impacting the wire appears symmetrical wrapping mode, asymmetrical wrapping mode, unilateral infiltration mode and partial wetting mode in turn. With the increase of the Weber number, the drop morphology appears in turn as spread-retracting, spread-splitting, spread-wrapping and spread-breaking modes when the axis of the drop impacts the wire. In addition, both eccentricity and Weber number have influence on the maximum spreading coefficient and the maximum spreading time. The wettability of wire has a significant effect on the spread-retracting behavior of drops. With the increase of hydrophilicity of wire, the peak dimensionless spreading area and spread-retracting stage of drops increase, and the retracting time is delayed.