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Diameter dependence of the cutoff molecular weights of drag‐reducing polymers
Author(s) -
Ting Robert Y.
Publication year - 1976
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1976.070201109
Subject(s) - drag , cutoff , reynolds number , polymer , turbulence , materials science , ethylene oxide , drag coefficient , mechanics , thermodynamics , physics , composite material , copolymer , quantum mechanics
Drag reduction data of poly(ethylene oxide) obtained in turbulent pipe flows were analyzed. A cutoff molecular weight for drag reduction was determined by correlating the drag reduction effectiveness with polymer molecular weight. Based on a time‐correlation onset concept, this critical molecular weight was found to depend on the pipe diameter and Reynolds number. This effect is examined using available experimental data.