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 …

The efficiency of drag reduction (DR) is known to be impaired by mechanical scission of
molecules, which is a great obstacle to the practical use of flexible polymeric drag reducers …

We study the ability of diutan gum (DG), a polysaccharide that belongs to a class called
sphingans, to improve drag reduction (DR) in turbulent flows. This new drag reducer is very …

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 …

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 …

Polymer-induced drag reduction (DR) in fluids was studied using a rotational rheometer with
double-gap concentric cylinder geometry. Although both polymers (polyacrylamide (PAM) …

Polymeric drag reducers have been developed over many years due to the great number of
practical applications. In all of them, the molecular stability is an essential requirement …

The transition from laminar to turbulent flows has challenged the scientific community since
the seminal work of Reynolds (Phil. Trans. R. Soc. Lond. A, vol. 174, 1883, pp. 935–982) …

Drag reduction by polymers is a critical issue, with several applications first reported more
than 70 years ago. The number of related works is vast, but most are restricted to single …

Turbulent drag can be reduced by the use of anti-turbulent additives, which are often
associated with significant economic benefits. For half a century turbulent drag reduction has …