Pressure Loss of Fly Ash Slurries in a Spiral Tube

The friction factor of fly ash slurries in a spiral tube with three-shaped groove tube walls has been analytically and experimentally obtained. It is made clear that the experimental data for the laminar flow range almost agree with the obtained analytical results for a pseudo-plastic fluid for which the rheological characterization of the slurries is determined by using the pressure loss data for the circular tube from the differential method. The drag reduction on the hydraulic transport of a solid has been obtained by using the fly ash slurries. Maximum drag reduction occurs at the spiral tube of p/D=6.98. The value of the drag reduction ratio is about 40%.