2024/10/28 by Yahua Liu, Liu, Yahua, Seyed Ali Hosseini +10
Engineering · Materials Science · Physics and Astronomy · #Fluid Dynamics and Heat Transfer #Surface Modification and Superhydrophobicity #Experimental and Theoretical Physics Studies
paper · pdf · doi:10.48550/arxiv.2410.20821
Contact time of bouncing drops is one of the most essential parameters to quantify the water-repellency of surfaces. Generally, the contact time on superhydrophobic surfaces is known to be Weber number-independent. Here, we probe an additional characteristic time, transition time inherent in water drop impacting on superhydrophobic surfaces, marking a switch from a predominantly lateral to an axial motion. Systematic experiments and numerical simulations show that the transition time is also Weber number-independent and accounts for half the contact time. Additionally we identify a Weber-independent partition of volume at the maximum spreading state between the rim and lamella and show that the latter contains 1/4 of the total volume of the drop.