Apparatus and Method for Measuring Low Concentrations of High Molecular Weight Polymers in Solution.
U S Patent 1983 Jun; (4):
In the title method, the differential pressure across a loop of tubing through which the polymer solution is flowing is measured. A drag reduction is calculated from the pressure drop, and the concentration is determined from a calibration curve of drag reduction versus polymer concentration.
U.S. Patent No. 4,386,518, June 7, 1983; Chem. Abstr. 96:P143,580g