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DIRECT SIMULATIONS OF A LIQUID SHEET IN COMPRESSIBLE GAS ENVIRONMENTS

George A. Siamas
Mechanical Engineering, School of Engineering and Design Brunei University Uxbridge, UB8 3PH, United Kingdom

Xi Jiang
Mechanical Engineering, School of Engineering and Design, Brunel University, Uxbridge UB8 3PH, United Kingdom

Luiz C. Wrobel
Mechanical Engineering, School of Engineering and Design Brunel University Uxbridge, UB8 3PH, United Kingdom

Abstrakt

An Eulerian approach with mixed-fluid treatment was adopted for the investigation of a liquid sheet present at the shear layer of a compressible gas jet. The effects of different topological configuration and surface tension on the flow development have been examined by direct solution of the compressible Navier-Stokes equations using highly-accurate numerical methods. The interface dynamics are captured using volume of fluid and continuum surface force models.
The simulations show that the dispersion of the liquid sheet is dominated by the vortical structures formed at the jet shear layer due to the Kelvin-Helmholtz instability with the axisymmetric case being less vortical than its planar counterpart. It has been identified that the vortical structure development differs between an axisymmetric and a planar configuration. Surface tension affects the flow vorticity and consequently the dispersion of the liquid in the gas environments. In an axisymmetric configuration surface tension tends to promote the vorticity development while in a planar configuration surface tension tends to demote vorticity.