Numerical investigation of a droplet impacting obliquely on a horizontal solid surface

Obliquely impacting of droplet on horizontal solid surface is studied numerically. The impact velocity (v(1)), both the magnitude and direction, is varied to analyze its effect on spreading area and droplet kinetics. The normal impact velocity (v(1)(n)) is found to be the main factor that influences the temporal variation of spreading area in droplet obliquely impacting process. The influence of normal Weber number (We(n)) on the restitution coefficients (epsilon(n) and epsilon(t)) is also investigated. Within the same impact angle interval, the normal restitution coefficient (epsilon(n)) grows with small We(n) and is with the general scaling relationship of epsilon(n) similar to We(n)(-1/4) for moderate We(n), which is similar to that in the droplet normal impact process. The tangential restitution coefficient (epsilon(t)) is found to vary around a constant value and this observation has been analyzed from the view of both droplet kinetics and dynamics. Moreover, we also study the influence of tangential velocity on viscous dissipation and find that large tangential velocity would induce higher viscous dissipation energy.

Automated summary

This study numerically investigates the oblique impact of a droplet on a horizontal solid surface. The impact velocity, both in magnitude and direction, is varied to analyze its effect on spreading area and droplet kinetics. It is found that the normal impact velocity is the main factor influencing the temporal variation of spreading area. The influence of the normal Weber number on the restitution coefficients is also examined, and it is observed that the tangential restitution coefficient varies around a constant value.