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Abstract
Abstract This study experimentally investigated the spreading behavior of droplets impacting wetted cylindrical surfaces. The temporal evolution of spreading dimensions along the circumferential and axial directions of the cylinder was measured. The effects of fluid type, impact velocity, cylinder diameter, and impact position on the spreading dimensions were analyzed. The findings show that the droplet velocity minimally influences the spreading dimensions. The spreading dimensions increase with cylinder diameter but remain nearly unchanged when the cylinder diameter exceeds four times the droplet diameter. The spreading characteristics of droplets under eccentric impact were also examined, revealing that forward spreading is significantly greater than backward spreading. Additionally, the phenomenon of one-sided spreading during eccentric impacts was investigated, and it was found that the critical condition for one-sided spreading is largely independent of the impact velocity.
Published Version
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