Abstract
In this study, effect of nano-fibrillated cellulose, whose water suspension is non-Newtonian fluid, on the transitional channel flow was investigated. Skin friction measurements and flow visualization of channel flows of single-phase water and the nano-fibrillated cellulose suspension were performed. Drag reduction was realized for the concentrated nano-fibrillated cellulose suspension of 400 ppm though the reduction range of Reynolds number is limited only for the transitional flows. The nano-fibrillated cellulose suspending into water causes transition delay in two-dimensional channel flow not only in terms of simple viscous increase due to the nano-fibrillated cellulose addition but also in comparison against the apparent Reynolds number.
