Accession Number : AD0681011

Title :   HEAT AND MOMENTUM TRANSPORT IN DILUTE POLYETHYLENE OXIDE SOLUTIONS,

Corporate Author : NAVAL UNDERWATER WEAPONS RESEARCH AND ENGINEERING STATION NEWPORT R I

Personal Author(s) : McNally,William A.

Report Date : DEC 1968

Pagination or Media Count : 83

Abstract : The purpose of this investigation was to study the turbulent pipe flow of dilute aqueous solutions of polyethlene oxide. In particular, this investigation was concerned with measurement of polymer solution friction factors in hydraulically rough pipe and with measurement of heat transfer coefficients in smooth pipes. The data were used to draw inferences about the mechanism of polymeric friction reduction and to test the theories which have been put forth in the literature concerning the phenomenon. Pressure drop was measured in a fully rough pipe, as well as in two smooth pipes of different diameter, as a function of flow rate and polymer concentration. Temperature rise was measured for flow of polymer solutions through a steam heated section of pipe, again as a function of flow rate and polymer concentration. It was found that the heat transfer coefficients are reduced as substantially as the smooth wall friction factors for these solutions. Rough pipe friction factors were reduced relative to that of water by the presence of the polymer solute, but the fractional reduction was not as great as that observed for smooth pipes. These results were used to show that the most widely accepted hypothesis concerning the cause of this frictional reduction phenomenon, stabilization and thickening of the viscous and transition sublayers, is probably incorrect. The influence of the polymer molecules is shown to extend beyond the viscous dominated wall layer. (Author)

Descriptors :   (*FLUID FLOW, *EPOXY RESINS), (*SKIN FRICTION, *POLYMERS), SOLUTIONS(MIXTURES), WATER, OXIDES, HEAT TRANSFER COEFFICIENTS, PIPES, VISCOSITY, TRANSPORT PROPERTIES, TURBULENCE, DRAG, LUBRICANTS

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE