Accession Number : AD0666818

Title :   AN ANALYSIS OF THE EFFECT OF A POLYMER ADDITIVE ON TURBULENT WALL FRICTION AND PRESSURE FLUCTUATIONS,

Descriptive Note : Research rept.,

Corporate Author : NAVY UNDERWATER SOUND LAB NEW LONDON CONN

Personal Author(s) : White,Frank M.

Report Date : 29 DEC 1967

Pagination or Media Count : 68

Abstract : The analysis first shows that flat plate drag reduction by polymers is also due merely to the thickening of the sublayer. Even though the plate friction decrease can be very large, the study then shows that the turbulent wall pressure is almost unaffected by the presence of the additive. The calculations of flow noise reveal that the additive has much the same effect as a favorable pressure gradient in Newtonian flow, namely, almost no change in mean pressure level but a small increase in the convection speed and the longitudinal correlation length. Tables and graphs show the estimated effect of various polymers on both friction and turbulent wall pressure. (Author)

Descriptors :   (*LAMINAR FLOW, POLYMERS), (*POLYMERS, LUBRICANTS), DRAG, FRICTION, REDUCTION, ADDITIVES, PRESSURE, TURBULENCE, BOUNDARY LAYER, PIPES, NOISE, FLAT PLATE MODELS, WALLS

Subject Categories : Lubricants and Hydraulic Fluids
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE