The Maximum Skin Friction and Flow Field of a Planar Impinging Gas Jet

[+] Author and Article Information
Adam Ritcey

Department of Mechanical Engineering McMaster University Hamilton, ON, Canada

Joesph R. McDermid

Department of Mechanical Engineering McMaster University Hamilton, ON, Canada

Samir Ziada

Department of Mechanical Engineering McMaster University Hamilton, ON, Canada

1Corresponding author.

ASME doi:10.1115/1.4036717 History: Received February 06, 2017; Revised April 27, 2017


The maximum skin friction and flow field is experimentally measured on a planar impinging gas jet using oil film interferometry (OFI) and particle image velocimetry (PIV), respectively. A jet nozzle width of W = 15 mm, impingement ratios H=W = 4;6;8; 10, and a range of jet Reynolds numbers Rejet = 11000- 40000 is tested to provide a parametric map of the maximum skin friction. The maximum skin friction predictions of Phares et al. [1] for plane jets agree within 5 % of the current OFI results for H=W = 6, but deviates upwards of 28 % for other impingement ratios. The maximum skin friction is found to be less sensitive to changes in the impingement ratio when the jet standoff distance is roughly within the potential core length of the jet. PIV measurements show turbulence transition locations moving towards the nozzle exit with increasing Reynolds number, saturation in the downstream evolution of the maximum axial turbulence intensity before reaching a maximum peak upon impingement, followed by sudden damping at the plate surface. As the flow is redirected, there is an orthogonal redistribution of the fluctuating velocity components, and local peaks in both the axial and transverse turbulence intensity distributions at the plate locations of the maximum skin friction.

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