Analysis study of entrainment and surface behavior of high speed air jet blowing out from a hole to stagnant water

Koizumi, Yasuo*; Nago, Kohei*; Uchibori, Akihiro ; Ohshima, Hiroyuki

A two dimensional air jet was blown out from a nozzle into water in a thin vessel. The behavior of the interface between water and the air jet were investigated by a high speed video camera. The recorded photos showed that the filament-like ears and wisps were pulled out from the wavy water surface and the droplets were entrained. As the air velocity increased, the number of droplets created by the air jet increased lineally and the smaller droplets increased. The correlation for the droplet diameter distribution developed for the annular dispersed two-phase flow in a pipe predicted well the present results.