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 …

The current work qualitatively surveys the phenomenon of polymer drag reduction from the
standpoint of the salient coherent motions in the near-wall region of wall-bounded turbulent …

Addition of a small amount of very large polymer molecules or micelle-forming surfactants to
a liquid can dramatically reduce the energy dissipation it exhibits in the turbulent flow …

The Oldroyd-B fluid has become the starting point for almost all complex flow calculations
and analysis involving the behavior of dilute polymer solutions. The reasons for this are …

Polymer additives can substantially reduce the drag of turbulent flows and the upper limit,
the so-called state of 'maximum drag reduction'(MDR), is to a good approximation …

In this study, we experimentally investigate the turbulent drag-reduction (DR) mechanism in
flow through ducts of circular, rectangular and square cross-sections using two grades of …

The secreting drag reduction mucus in fish epiderm inspires the manufacturing of five gelatin–
polysaccharide drag reduction coatings. First, a mixed solution composed of the gelatin and …

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 …

Bubble drag reduction has been shown to be a promising technique for reducing the drag in
ships, thus reducing the emission of pollutants and allowing the compliance with the new …

Nontoxic bio-polymeric drag reducers are of great practical importance. In this work, a new
natural and environmentally friendly drag reducer is introduced, which is extracted from the …