Abstract
Numerical simulation of laminar flows with a pair of streamwise vortices and with a single low-speed streak was carried out in order to investigate the effect of surfantant on a pair of streamwise vortices and the single low-speed. In non-Newtonian fluid flow, the results shows the streamwise vortices were inhibited and the low-speed streak survived. The streamwise vortices existed around the low-speed streak in Newtonian flow, but the streamwise vortices were inhibited at downstream. Low-speed streak in non-Newtonian fluid flow differs in structure from that in Newtonian.
