Accession Number : ADA302214

Title :   Particle Dispersion in Turbulent Sprays.

Descriptive Note : Final technical rept. 1 Aug 92-31 Jul 95,

Corporate Author : CALIFORNIA UNIV DAVIS

Personal Author(s) : Kennedy, Ian M. ; Kollmann, Wolfgang

PDF Url : ADA302214

Report Date : 31 JUL 1995

Pagination or Media Count : 51

Abstract : A Large Eddy Simulation (LES) was used to model a two phase turbulent round jet. The LES for the continuous phase used the Smagorinsky model for the sub-grid scale motion. A simple model for the effect of the particles on the continuous phase was developed. The model was essentially a momentum balance for a fluid volume containing particles moving relative to the continuous phase. The simulation showed that particles accelerated the roll up of the shear layer. Droplet dispersion was measured in a turbulent round jet of air issuing into still air. Individual droplets were formed with a piezoelectric device; they were injected onto the centerline of the jet. Their location across the jet was measured at different axial stations with a laser sheet and position sensing photomultiplier tube. Particles containing a fluorescent dye were injected into a turbulent spray. Spray scattering was rejected with a Raman filter. Dispersion of the tagged particles was measured. Results agreed with the LES in which the injection of the spray enhanced development of the jet and the dispersion of particles.

Descriptors :   *DISPERSANTS, *TURBULENCE, *EDDIES(FLUID MECHANICS), SHEAR PROPERTIES, SIMULATION, INJECTION, LIGHT SCATTERING, POSITION(LOCATION), OPTICAL DETECTION, LAYERS, PARTICLES, PIEZOELECTRIC CRYSTALS, DROPS, FLUORESCENT DYES, PHOTOMULTIPLIER TUBES, SPRAYS, RAMAN SPECTRA, MOMENTUM, LABELED SUBSTANCES.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE