DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf
ISBN Print: 978-1-56700-262-1
ISSN: 2377-2816
Drag reduction of turbulent channel flow by polymer release from wall
ABSTRAKT
A discrete-element model (spring-dumbbell model) is used to investigate the mechanism of drag reduction by addition of a small amount of polymer in turbulent wall-bounded flow of Newtonian fluid by direct numerical simulations. By using the discrete-element model, the spatial concentration of the polymer can be obtained numerically. In this study, the effect of the element release from the wall upon the drag reduction rate is examined in detail. As for the element release case with random direction, the drag reduction rate par element is larger than that of the all initially distributed case. The effects of initial angle of discrete-element model upon the drag reduction rate are also examined.