Abstract
The effect of roughness on the mean flow characteristics of a turbulent wall jet flow has been experimentally investigated using laser Doppler anemometry. The Reynolds number based on the slot height and exit velocity of the jet was Re≈ 7, 500. A 36-grit sheet was used as the rough surface, creating a transitionally rough flow (5 ≤ k +≤ 70). Both conventional and momentum-viscosity scaling were used to analyze the streamwise evolution of the flow. The measurements indicate that surface roughness does not affect the value of the jet spread rate or the decay of the maximum velocity. However, the thickness of the inner layer increases. Profile fitting was used to estimate the friction velocity. The results showed that at Re m ≈ 3, 500 the roughness caused an increase of about 30% in the skin friction coefficient.
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Acknowledgements
The authors acknowledge the technical advice and assistance of Mr. D. Deutscher and Prof. J. D. Bugg. Research funding from NSERC is also gratefully acknowledged.
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Rostamy, N., Bergstrom, D.J., Sumner, D. (2010). An Experimental Study of a Turbulent Wall Jet on Smooth and Rough Surfaces. In: Nickels, T. (eds) IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls. IUTAM Bookseries, vol 22. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-9631-9_8
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DOI: https://doi.org/10.1007/978-90-481-9631-9_8
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