Abstract
The anomalous decrease of apparent solution viscosity (measured by a rheoviscometric system with a metal disc) below the viscosity of pure water was monitored by studying highly diluted solutions of water-soluble polymers. The phenomenon suddenly vanishes below 35°C, which is not the case for a simple drag reduction. It is suggested that the explanation is in the complex functioning of drag reduction and viscoelastic behaviour of the adsorbed polymer layer at the metal disc.
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