Drag Reduction in Polymer-Laden Turbulent Pipe Flow

The turbulence of a realistic dilute solution DNA macromolecules is investigated through hybrid Eulerian–Lagrangian approach that directly solves the incompressible Navier–Stokes equation alongside evolution 108 polymers, modelled as finitely extensible nonlinear elastic (FENE) dumbbells. At friction Reynolds number 320 and Weissenberg 2×104, drag reduction equal to 26%, which similar one obtained at lower 180. polymers induce an increase in flow rate turbulent kinetic energy, whose axial contribution predominantly augmented. stress balance analysed investigate causes eventually effect on probability distribution polymer configuration. Near wall, majority are fully stretched aligned along streamwise direction, inducing anisotropy.