Abstract
IN very dilute solutions of high molecular weight polymers, turbulent friction may be much smaller than in corresponding flows of the solvent alone1. It is widely believed that this drag reduction must be associated with visco-elastic properties of the liquid, but such properties are difficult to detect in very dilute solutions. I describe here an instrument that reveals departures from Newtonian behaviour even with very low concentrations.
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References
Gadd, G. E., Nature, 212, 874 (1966).
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GADD, G. Pulsatile Flow Instrument for detecting Viscoelasticity in Dilute Polymer Solutions. Nature 225, 724–725 (1970). https://doi.org/10.1038/225724a0
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DOI: https://doi.org/10.1038/225724a0
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