Observation of the liquid film on a circular plate formed by a droplet train impingement

Abstract

Droplet impingement phenomena are found in the wide variety of industrial processes, however the detail of liquid film structure formed by the continuous impact of droplets is not clarified. In this study, we experimentally investigated behavior of circular plate. The effects of nozzle diameter and liquid flow rate on the jump diameter were investigated. In addition, we compared the liquid film by the droplet train impact with that by a liquid column impact. As a result, the hydraulic jump was observed under the smaller water flow rate condition compare to the liquid column impact. And the jump diameters for the case of droplet train impact were greater than that of liquid column impact. In addition, the liquid film heights after hydraulic jump on a small circular plate were sensitive to either the droplet train impact or liquid column impact.

Observation of liquid infiltration process into closed-end holes by droplet train impingement

“…The droplet diameter was randomly selected and the average value calculated. The droplet diameter was approximately 1.88 times the nozzle diameter d, similar to previous studies (Suzuki et al, 2015, Muraki et al, 2017. In the case of the liquid column, the mass of liquid ejected from the nozzle was sampled for 10 s, and the flow rate and averaged velocity were obtained.…”

“…The experiments were conducted for liquid temperatures of 18.5-26.2 °C. Further details are given in Muraki et al (2017).…”