High-speed visualisation of primary break-up of an annular liquid sheet |
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Authors: | Stevano Wahono Damon Honnery Julio Soria Jamil Ghojel |
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Institution: | (1) Laboratory for Turbulence Research in Aerospace & Combustion (LTRAC), Monash University, Clayton, VIC, 3800, Australia |
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Abstract: | In this experimental study, a thin annular moving water sheet is placed between two annular co-flowing air streams. The shear
at the interface gives rise to Kelvin–Helmholtz type instabilities and promotes development of a sinuous surface wave at the
gas–liquid interface. The amplitude of the surface wave is amplified as it travels downstream of the nozzle exit until it
ruptures forming spanwise and streamwise ligaments. The liquid sheet is illuminated with high-powered halogen lamps. High-speed
imaging is used in this study to qualitatively visualise the structure of the spray—of particular interest is the evolution
of the spray into a ligament structure during the primary break-up and the role the outer air stream plays in this process.
Sequences of images with high temporal resolution (∼2,000 fps) are recorded for image processing and analysis of the surface
waves and ligament formation. A preliminary analysis of the waveform of the outer gas–liquid interface of the annular liquid
sheet over a range of conditions shows the sheet Strouhal number to increase with increasing gas to liquid momentum ratio.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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