Turbulence structure on the surface of high speed liquid jet

QC 20211018
The structures on the surface of high-speed capillary liquid jet were captured with the help of high-speed camera and microscope. Apower spectral density method is used to deal with the jet images. Based on captured jet image, the variation of surface structures near the exit of the nozzle is divided into three sections: laminar section, instability section and turbulence section. There is no clearly surface structures in the laminar section. The wave-like structures come out in the instability section with a sudden and are regularly increase with a small slope along the streamwise. The degree of order is rather weak in the turbulence section. The increase of the Reynolds numbers which based on the momentum thickness at the exit of the nozzle will accelerates the jet surface transition from the laminar section to turbulence section.

TEKNIK OCH TEKNOLOGIER Maskinteknik Strömningsmekanik och akustik hsv//swe
ENGINEERING AND TECHNOLOGY Mechanical Engineering Fluid Mechanics and Acoustics hsv//eng
High-speed camera
Liquid jet
Power spectral density method
Surface wave
Cameras
High speed cameras
Jets
Liquids
Nozzles
Reynolds number
Spectral density
Surface structure
Surface waves
Turbulence
Degree of order
High Speed
Jet surfaces
Liquid jets
Momentum thickness
Turbulence structures
Fighter aircraft

In:ASME/JSME/KSME 2015 Joint Fluids Engineering Conference, AJKFluids 2015: American Society of Mechanical Engineers9780791857229

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