Abstract
Drag reduction in turbulent pipe flow by means of boundary and centerline injection of long hairlike fibers has been investigated. Experiments have been conducted at various main flow Reynolds numbers as well as at various injection rates of the fiber suspensions. The occurrence of drag reduction was observed even with a trace quantity of the fibers. Comparison of the two modes of fiber injection indicates that elongated fibrous elements are more effective as drag reducers when they are present in the outer region of the turbulent core. Measurements of the mean velocity profiles with both modes of injection indicate that the drag reduction can be attributed to a reduction in the momentum transfer ability of the suspensions in the turbulent core.
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