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Drag reduction by collapsed and extended polyelectrolytes


I REPORT experiments on drag reduction by saline solutions of a partially hydrolysed polyacrylamide (PAMH) showing the effect of macromolecule conformation. The extreme collapsed and extended PAMH conformations also simulate the deportment of linear random-coiling macromolecules in solution, and of high aspect ratio fibres in suspension; and they indicate a possible relationship between the mechanisms of drag reduction produced by these additives.

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VIRK, P. Drag reduction by collapsed and extended polyelectrolytes. Nature 253, 109–110 (1975).

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