Accession Number : AD0625801

Title :   EFFECT OF MOLECULAR WEIGHT AND SEGMENTAL CONSTITUTION ON THE DRAG REDUCTION OF WATER SOLUBLE POLYMERS.

Descriptive Note : Final rept.,

Corporate Author : WESTERN CO OF NORTH AMERICA DALLAS TEX RESEARCH DIV

Personal Author(s) : Pruitt,Gail T. ; Crawford,Horace R.

Report Date : APR 1965

Pagination or Media Count : 125

Abstract : Tube flow data on some 16 polymers indicate that drag reduction is a function of molecular contour length, segmental side groups, concentration, pipe diameter and Reynolds number. The maximum drag reduction actually obtained with any drag reducing polymer is approximately 80% of that which would be obtained if completely laminar flow was maintained. A relationship that correlates drag reduction, concentration and molecular dimensions is suggested for a constant Reynolds number and pipe size. It infers that a critical concentration of polymer exists, below which no drag reduction occurs. Also for some given concentrations and pipe size a critical velocity exists below which no drag reduction occurs. Rheological data for two polymer solutions are presented in terms of elastic energy. (Author)

Descriptors :   (*DRAG, REDUCTION), (*POLYMERS, MOLECULAR STRUCTURE), (*SKIN FRICTION, POLYMERS), MOLECULAR WEIGHT, CONCENTRATION(CHEMISTRY), REYNOLDS NUMBER, TURBULENCE, LAMINAR FLOW, PIPES

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE