A small amount of polymer additives can cause substantial reduction in the energy
dissipation and friction loss of turbulent flow. The problem of polymer-induced drag …

Polymer additives and surfactants as drag reduction agents have been widely used in the
field of fluid drag reduction. Polymer additives can reduce drag effectively with only a small …

Fine-scale flow motions are measured in a Newtonian and polymer drag-reduced turbulent
boundary layer (TBL) at a common momentum thickness Reynolds number-criterion. We …

The two-dimensional, steady, homogeneous flow field proposed by Astarita (J. Rheol., vol.
35, 1991, pp. 687–689) is studied for a range of viscoelastic constitutive equations of …

We present an experimental investigation of turbulent drag reduction with flexible and rigid
polymer solutions in a 2: 1 aspect ratio rectangular duct. The flexible polymer is partially …

Long-chained, viscoelastic surfactant solutions (VES) have been widely employed in the oil
and gas industry, particularly in hydraulic fracturing and gravel-packing operations, where …

Particle image velocimetry (PIV) measurement technique provides an excellent opportunity
for investigating instantaneous spatial structures which are not always possible with point …

The effect of drag‐reducing agents (DRAs) on fluid flows in straight pipes has been well
documented. Key among these is the effect of DRAs on turbulence statistics (Reynolds …

Mechanical molecular scission is the main problem of polymeric drag reducers. The ability to
reduce the drag is notably decreased as the molecules break down step by step as time …

In this paper we analyze the active and hibernating turbulence in drag-reducing plane
Couette flows using direct numerical simulations of the viscoelastic finitely extensible …