V.Korobov
The influence of longitudinal ribbing on hydrodynamic friction

Applied hydromechanics, Vol. 7 (79) ¹ 1, (2005) p.90-92
Weight measurements in a water tunnel have shown that there exist a range of parameters of longitudinally fine-ribbed surface such that turbulent friction in flow over the surface is less than that over a smooth flat plane of the same projected area. Maximum drag reduction due to ribbing is up to 16%.
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TEXT LANGUAGE: Ukrainian