Anisotropic particles are common in many industrial and natural turbulent flows. When these
particles are small and neutrally buoyant, they follow Lagrangian trajectories while …

This article provides a review of recent progress in understanding and predicting polymer
drag reduction (DR) in turbulent wall-bounded shear flows. The reduction in turbulent friction …

This review presents an overview of the literature concerning microgel particles with
emphasis on work performed during the past 5 years. Microgel particles are cross-linked …

It is well known that the drag in a turbulent flow of a polymer solution is significantly reduced
compared to Newtonian flow. Here we consider this phenomenon by means of a direct …

Turbulent drag reduction by polymer additives in a channel is investigated using direct
numerical simulation. The dilute polymer solution is expressed with an Oldroyd-B model that …

The viscosity as a function of concentration for xanthan gum in both salt‐free solution and in
50 mM NaCl is measured and compared with a scaling theory for polyelectrolytes. In …

Drag reduction due to dilute addition of high polymers has been known for about fifty years.
In spite of this long history, many aspects of the problem remain poorly understood. Two of …

A cylindrical pipe facility with a length of 32 m and a diameter of 40 mm has been designed.
The natural transition Reynolds number, ie the Reynolds number at which transition occurs …

In this paper we report on (two-component) LDV experiments in a fully developed turbulent
pipe flow with a drag-reducing polymer (partially hydrolyzed polyacrylamide) dissolved in …

The paper concerns an experimental study of the fully developed turbulent pipe flow of
several different aqueous polymer solutions: 0.25%, 0.3% and 0.4% carboxymethylcellulose …