Taylor-Couette flow, the flow between two coaxial co-or counter-rotating cylinders, is one of
the paradigmatic systems in the physics of fluids. The (dimensionless) control parameters …

The lubrication of external liquid flow with a bubbly mixture or gas layer has been the goal of
engineers for many years, and this article presents the underlying principles and recent …

Fluid turbulence is commonly associated with stronger drag, greater heat transfer, and more
efficient mixing than in laminar flows. In many natural and industrial settings, turbulent liquid …

Superhydrophobic surfaces have the potential to reduce the viscous drag of liquids by
significantly decreasing friction at a solid-liquid interface due to the formation of air layers …

For centuries, bubbles have fascinated artists, engineers, and scientists alike. In spite of
century-long research on them, new and often surprising bubble phenomena, features, and …

The injection of gas bubbles into a turbulent boundary layer of a liquid phase has multiple
different impacts on the original flow structure. Frictional drag reduction is a phenomenon …

To investigate the phenomena of skin-friction drag reduction in a turbulent boundary layer
(TBL) at large scales and high Reynolds numbers, a set of experiments has been conducted …

The effect of a few relatively large bubbles injected near the walls on the wall drag in the
“minimum turbulent channel” is examined by direct numerical simulations. A front …

The flow of fluids in channels, pipes, or ducts, as in any other wall-bounded flow (like water
along the hulls of ships or air on airplanes) is hindered by a drag, which increases manyfold …

In the maritime industry, the injection of air bubbles into the turbulent boundary layer under
the ship hull is seen as one of the most promising techniques to reduce the overall fuel …