Study of dynamics of large-scale vortex structures in a sweeping jet entering a slot channel
M.V. Shestakov, D.M. Markovich
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk,Russia
Keywords: Inconel 617 nickel alloy, thermal diffusivity, thermal conductivity, laser flash method
Abstract
The experimental study was performed for a submerged turbulent jet that enters a slot channel with the height of h = 4 mm. The oscillating turbulent jet is generated by a fluidic oscillator with two feedback channels and the exit nozzle with the throat width of d = h . The working fluid is distilled water. The two-component velocity field was acquired using the PIV method with a high resolution up 50 5 kHz. The information was gained about the sweeping turbulent jet (both structure and dynamics) entering a slot channel for the Reynolds number in the range from 1500 to 8000. The jet flow to the slot channel generates large-scale 2D vortex structures. The travel frequency of those structures depends on the jet sweeping frequency produced by a fluidic oscillator. Comparison of the research result with available experimental data demonstrated that for a flow in a slot channel (with geometry h/d = 1) has a smaller angle of jet sweeping. For a higher Re number we observe a variation in distributions of average and pulsation characteristics of the sweeping jet as well as a decrease in the dimensionless jet sweeping frequency.
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