Liquid Atomization Phenomena Based on Laminar-Turbulent Transition of a Radial Liquid Sheet

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Perforations caused by a laminar-tubulent transition of a radial liquid sheet are described. A liquid film produced by a impingement of liquid to a disk center spreads out radially on the disk and forms a radial liquid sheet outside the disk edge. The radial liquid sheet is unstable because of an internal velocity profile with an inflexional point. The instability causes a laminar-turbulent transition just outside the disk edge and the taransition leads to strong tubulence. Flow patterns completely depend on the frequency of perforations produced by the strong turbulence. The countless perforations lead to atomization of the liquid sheet. and no perforation results in a smooth liquid sheet. The perforation frequency relys on the configurations of streaky aggregations produced by fine waves after the transition. The wavy short aggregations induce the countless perforations and atomization immediately after the transition. The perforation frequency also relys on liquid properties and temperture of ambient gas. Chemical properties of the liquid sustaning a very thin liquid sheet like a soap bubble suppress the perforation and hot ambient air promotes the perforation.