Accession Number : AD0615673

Title :   FRICTIONAL DRAG REDUCTION,

Corporate Author : TECHNION - ISRAEL INST OF TECH HAIFA

Personal Author(s) : Elata,C. ; Tirosh,J.

Report Date : 15 DEC 1964

Pagination or Media Count : 6

Abstract : The paper deals with changes in the turbulent boundary layer resulting in frictional drag reduction. Experiments are described, showing a remarkable decrease in friction coefficients for dilute solutions of separan AP 30 and guar gum. It is shown from these data, and those available in literature for all kinds of additives, that drag reduction effects nearly always coincide with a decrease in the universal constant k. This contradicts the generally accepted Reynolds similarity principle, which is the conventional assumption on which the analysis of the turbulent boundary layer is usually based. Furthermore, it appears that an additional entity must exist which influences the mechanism of turbulent flow. (Author)

Descriptors :   (*DRAG, TURBULENT BOUNDARY LAYER), (*TURBULENT BOUNDARY LAYER, DRAG), FRICTION, REDUCTION, FLUIDS, FLUID DYNAMICS, PIPES, MATHEMATICAL ANALYSIS, ISRAEL

Distribution Statement : APPROVED FOR PUBLIC RELEASE