Effect of Initial Conditions on the Development of Two-Phase Jets
Final rept. Jan-Dec 1989
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
Pagination or Media Count:
The results of an experimental investigation into the behavior of an unconfined, steady, fully turbulent, two-phase jet of diameter of 12.7 mm at the exit, with an exit flow velocity of 50 ms and containing particles with a mass density of loading of 1.5 is described. The second phase consisted of glass beads 80 microns in diameter. Velocity profiles in a plane parallel to the exit of the jet at several downstream stations, as well as the rms values, turbulent intensity and velocity cross correlations were measured for both phases. The radial rms velocities of the particles, although similar to those of the fluid, were found to be surprisingly higher than for a jet of 25.4 mm in diameter with a lower exit velocity. Measurements of the particle velocities were extremely sensitive to changes in the upstream boundary conditions. Keywords Laser doppler anemometry Two phase flow.
- Fluid Mechanics