INVESTIGATION FOR THE USE OF ADDITIVES FOR THE REDUCTION OF PRESSURE LOSSES,
Abstract
A study was made of the effect of some friction reducing additives MIL-H-5606A hydraulic fluid It was demonstrated that a friction reduction as high as 60% can be achieved. Two percent (wt) of the additive selected for extensive testing increased the apparent viscosity by a factor of about two and increased the density by about 0.2%. The base fluid was found to be slightly non-Newtonian (shear thinning). The addition of the additive made the fluid more non-Newtonian, as anticipated. Velocity profile data were taken within 0.01 inches of the wall. These data showed that the viscous sublayer for the treated fluid is three to ten times thicker than that for the base fluid, also the profiles for the treated fluid are more laminar than those of the base fluid. That is, the intensity of turbulence is reduced by the addition of the additive. Negative values of the pitot differential pressure were obtained very near the wall, in some cases. A deeper investigation might show this to be due to the development of elastic forces in the fluid. The additive can produce friction reduction in fairly viscous oils and should be tried in an Army hydraulic transmission system. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 30, 1965
- Accession Number
- AD0613345
Entities
People
- G. T. Pruitt
- H. R. Crawford