Calculations of turbulent boundary layer flows with drag reducing polymer additives

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Abstract
Results of investigations into numerical predictions of turbulent flows in plane two‐dimensional channels and circular pipes with and without polymer additives are presented. These predictions are based on an available computer program for two‐dimensional boundary layer flows and on the k‐ε turbulence model. The model takes into account the low Reynolds number effects in the immediate vicinity of the wall and is modified to take into account the influence of the polymer additives in smooth as well as rough conduits in accordance with experimental results available in the literature. Results of the predictions are presented and compared with experiments. Based on the reliability of the present predictions and the uncertainty in the available measurements, a practical approach is outlined to study turbulent flows with drag reducing polymer additives. Degradation of polymer molecules is predictable with the described theoretical model.

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