DRAG REDUCTION IN A TURBULENT CHANNEL FLOW WITH HYDROPHOBIC WALL

作者：Nouri Nowrouz Mohammad^*; Sekhavat Setareh; Mofidi Alireza

来源：Journal of Hydrodynamics, 2012, 24(3): 458-466.

DOI：10.1016/S1001-6058(11)60267-9

• superhydrophobic surface
• Large Eddy Simulation (LES)
• drag reduction
• slip length
• turbulence structures

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-tau = 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.

• 出版日期2012-7