Prediction of the size distribution of secondary ejected droplets by crown splashing of droplets impinging on a solid wall

摘要

Crown splashing is frequently observed during the impact of a droplet on a rough or wet wall. The size distribution of secondary ejected droplets has been experimentally observed to satisfy the log-normal distribution which contains two free parameters: the most probable diameter d_s and the width of the distribution γ. The most probable diameter will be determined through a simplified physical analysis. The width of distribution will be determined by using the principle of maximum rate of entropy production. The theory, containing no free parameters, predicts known experimental results with an acceptable engineering accuracy, provided the Froude number is high enough.