Thickness of the elastic sublayer in the velocity field of diluted polymeric solutions

Abstract

Results from a series of rheological and pipe flow experiments using watersoluble hydroxyethylcellulose and polyethyleneoxide are presented. Phenomena of drag reduction were investigated for values of concentration (in weight) of polymers in water ranging 2=10 4 to 2=5.10 -3. Velocity measurements by using a laserDoppler anemometer to type DISA-Mark II served for determining the variation in thickness of the elastic sublayer in the turbulent flow exhibiting drag reduction.