Abstract
Long hair-like fibres were injected at the boundary and centreline of a turbulent pipe flow of water and polymeric solution. Pressure drop and mean velocity profiles were measured at various Reynolds numbers and injection rates in order to study some mechanistic aspects of drag reduction in these additive systems. Drag reduction in a fibre-water system is attributed to a decrease in the momentum transfer in the turbulent-core region, whereas synergism has been found to be a wall phenomenon.
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