Abstract
Drag reducing flows by nylon fibers are investigated to discuss the mechanism of the drag reduction with fiber suspensions and to develop the prediction method of the drag reduction range. For the prediction method, time scale ratio of drag reducing additives like fibers to coherent fine scale eddy is introduced. Since the time scale of a given fiber is considered to be constant, the time scale ratio depends only on the time scale of the coherent fine eddy for a given fiber. The time scale of the coherent fine eddy can characterize the range of drag reduction for pipes of different diameters very well. The drag reduction occurs in specific range for low fiber concentration, while the drag reduction range shift to the small time scale of the coherent fine scale eddies for high fiber concentration. The characteristic time of the fiber as a drag reducer becomes longer in proportion to the second power of the fiber aspect ratio for low concentration.
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