It has become a well-known fact that finding sustainable solutions to the unavoidable high
pressure losses accompanying pipeline flows to increase the pumping capacity without …

Water-soluble polymers with high molecular weights are known to decrease the frictional
drag in turbulent flow very effectively at concentrations of tens or hundreds of ppm. This drag …

The effect of adding a drag reducing polymer in the water phase during horizontal oil–water
flows was studied experimentally. Experiments were carried out in a 14 mm ID acrylic pipe …

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 …

Hydrodynamic and viscoelastic interactions between the turbulent fluid within a channel at R
e τ= 180 and a polymeric phase are investigated numerically using a multiscale hybrid …

Pipelines encounter high pressure losses during transport of high viscous crudes, especially
at lower temperatures present in deep-waters. With emphasis on flow regimes and pressure …

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

Five linear, water-soluble, sulfonated polyacrylamides of relatively high molecular weights
were used to investigate drag reduction in oil–water multiphase flow through a horizontal …

Experimental investigation of the effects of drag-reducing polymer on oil–water flow patterns,
pressure drops, phase inversion and slip ratio in a horizontal acrylic pipe of 30.6-mm ID was …

It was believed that fluid flow and the laminar to turbulent transition delay were more easily
controlled on smooth surfaces until the discovery of the grooved shark skin surface that …