Influence of the Physical Properties of a Liquid on Perforations in a Radial Liquid Sheet Jet

Abstract

Perforations caused by the laminar-turbulent transition of a radial liquid sheet are described. A liquid film discharged from a small gap between a disk and a nozzle flows radially outward on the disk and forms a radial liquid sheet beyond the disk edge. The radial liquid sheet is unstable because of the internal velocity profile with an inflexion point. The instability causes a laminar-turbulent transition just beyond the disk edge and the transition leads to strong turbulence. Flow patterns depend completely on the frequency of perforations produced by this turbulence; that is, a large number of perforations leads to atomization of the liquid sheet, whereas no perforations results in a smooth liquid sheet. In this paper, we clarified the dependence of perforation on the physical properties of test liquids.

Keywords

• atomization
• transition
• free surface flow
• stability
• interfacial phenomena