Accession Number:

AD0631209

Title:

DRAG-REDUCING FLUIDS IN A FREE TURBULENT JET.

Descriptive Note:

Research rept.,

Corporate Author:

NAVAL ORDNANCE TEST STATION CHINA LAKE CALIF

Personal Author(s):

Report Date:

1966-04-01

Pagination or Media Count:

24.0

Abstract:

To determine whether drag reduction is the result of turbulence dampening per se, the decay characteristic of a free turbulent jet was investigated. The work was suggested by recent boundary-layer studies showing that fluid drag reduction is caused by the presence of high-molecular-weight polymers in solution. The jet, having all the properties associated with turbulence except those caused by the presence of a wall, provided an ideal tool for the experiment. It was found that in a water solution of drag-reducing polymer, shear stress was reduced in the nozzle but not in the free jet. Drag reduction was therefore concluded to be a phenomenon of the wall because the character of the turbulence that is beyond the influence of the wall resembles the character of the turbulence in a free jet, which was found to be unaffected by the drag-reducing agent. Author

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE