The maximum impingement plate skin friction and flow field is measured for an acoustically forced planar impinging gas jet using oil film interferometry (OFI) and particle image velocimetry (PIV), respectively. The study is performed at a jet Reynolds number of Rejet = 11,000 and an impingement distance H, which is set to eight times the nozzle width W. The planar impinging gas jet is forced at the jet nozzle exit using Strouhal numbers StH = 0.39, 0.76, and 1.1, which are similar to those associated with the jet-plate tones measured in air-knife wiping experiments. The flow-field measurements indicate that the jet column oscillates at the applied forcing frequency, and depending on the forcing frequency, organized vortex structures can be identified in the shear layers that impinge on the plate surface. Both of these jet oscillation features result in a reduction in the time-averaged maximum impingement plate skin friction. This skin friction reduction is attributed to momentum loss at the jet centerline caused by increased levels of fluid entrainment and mixing of the surrounding quiescent fluid.
Effect of Jet Oscillation on the Maximum Impingement Plate Skin Friction
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received October 2, 2017; final manuscript received February 21, 2018; published online April 19, 2018. Assoc. Editor: Devesh Ranjan.
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Ritcey, A., McDermid, J. R., and Ziada, S. (April 19, 2018). "Effect of Jet Oscillation on the Maximum Impingement Plate Skin Friction." ASME. J. Fluids Eng. September 2018; 140(9): 091201. https://doi.org/10.1115/1.4039515
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