Abstract
This paper investigates a theoretical prediction of friction drag reduction in turbulent channel flow which is achieved by using superhydrophobic surfaces. The effect of the hydrophobic surface is considered to be a slip boundary condition on the wall, and this new boundary condition is added to Large Eddy Simulation (LES) equations. The predicted drag reduction at Re τ = 180 is approximately 30%, which concurs with results obtained from Direct Numerical Simulation (DNS). An important implication of the present finding is that the near-wall turbulence structures are modified with streamwise slip velocity. In addition, a noticeable effect on the turbulence structure occurs when the slip length is greater than a certain value.
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Biography: NOURI Nowrouz Mohammad (1959-), Male, Ph. D., Associate Professor
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Nouri, N.M., Sekhavat, S. & Mofidi, A. Drag Reduction in a Turbulent Channel Flow with Hydrophobic Wall. J Hydrodyn 24, 458–466 (2012). https://doi.org/10.1016/S1001-6058(11)60267-9
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DOI: https://doi.org/10.1016/S1001-6058(11)60267-9