Accession Number:

AD0680687

Title:

MIXING OF GASEOUS WAKE JETS,

Descriptive Note:

Corporate Author:

JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s):

Report Date:

1968-09-12

Pagination or Media Count:

16.0

Abstract:

The dependence of average flow parameters and dimensions of the mixing zones of two coaxial jets of an incompressible gas upon the initial conditions was determined experimentally. Different initial conditions were created by mounting fine-mesh grids in the initial section of the flow. When grids of 0.07 mm mesh size are used, the ordinate of the inner boundary of the mixing zone decreases linearly down to a wake flow velocity ratio of m 0.95, whereas in the absence of grids at the exit plane mixing no longer depends on the velocity ratio, starting with m 0.5, and is completely determined by boundary layer parameters at the nozzle wall separating the two flows. A relation was found between mixing and density ratio for submerged jets of different density flowing into different media. The density ratio varied from 7 for an air jet in a helium atmosphere to 30 for a helium jet in a Freon-12 atmosphere. Author

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE