Laminar and turbulent entry flow of polymer solutions

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Abstract
Entry lengths and contraction losses have been determined for 0.01, 0.2 and 0.6% aqueous solutions of Separan AP‐30. The Reynolds numbers ranged between 102 and 105 in 1/2‐in. and 2‐in. tubes. At Reynolds numbers in excess of 2100, the entry lengths and contraction losses for the polymer solutions are significantly larger than those for Newtonian fluids. These effects are shown to be related to the transitional flow phenomena which occur with drag reducing polymer solutions.At low Reynolds number the contraction loss data show expected trends but are in quantitative disagreement with predictions based on recent studies in capillary tubes. These indicate that the analyses based on small tubes are less general than anticipated.