Particle Image Velocimetry (PIV) technique combined with flow visualization was applied in heterogeneous drag reduction to examine the motion of the polymer thread and the mixing process of polymer and water simultaneously at Reynolds numbers of 15000. The instantaneous velocity profiles for water/polymer motion showed in some cross-sections differences in the velocities of the two phases which indicates an interaction between the polymer thread and the water phase. The results of this interaction have not a significant effect on the drag reduction compared with the influence of the mixing process.
Experiments in Fluids – Springer Journals
Published: Feb 14, 1997
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