The aim of this work was to investigate the effect of bubbles on turbulent flow. We investigated in turbulent Taylor-Couette flow the effect of turbulent boundary layers on the drag. We showed that this drag can be 30 times higher as compared to the smooth wall case, leading to the conclusion that it is energetically efficient to keep the wall roughness for ships to an absolute minimum. When either one of the two walls is smooth, we observed that the overall behavior of the drag was surprisingly governed by this smooth wall.
|Award date||21 Dec 2006|
|Place of Publication||Enschede|
|Publication status||Published - 21 Dec 2006|