Abstract
The purpose of this work is to investigate experimentally the pressure drop of drag-reducing polymer solutions in the fully developed flow region in a periodically sudden converging-diverging tube as well as in a straight tube. Testing fluids were aqueous polyacrylamide solutions with concentration ranged from 200 to 1400 w.p.p.m., and the Reynolds number ranged from 5 × 103 to 7 × 104. Drag-reducing phenomenon is found to exist in the straight tube flow with the viscoelastic fluid, while in the periodically sudden converging-diverging tube the friction factor is insensitive to the concentration of solution.
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