FRICTIONAL DRAG REDUCTION,
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 15, 1964
- Accession Number
- AD0615673
Entities
People
- C. Elata
- J. Tirosh
Organizations
- Technion – Israel Institute of Technology