Droplet-Turbulence Interactions Over a Wide Spectral Range.
Final technical rept.,
CALIFORNIA UNIV IRVINE DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
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The unsteady, three dimensional, incompressible, viscous flow interactions between a single vortex tube or a pair of vortex tubes advected by a uniform free stream and a spherical particle held fixed in space were investigated numerically for a range of particle Reynolds numbers between 20 and 100. Useful correlations of lift coefficient, moment coefficient, and drag coefficient with velocity fluctuation, Reynolds number, offset distance, and initial vortex size were obtained and reported. A new mechanism based upon droplet lift has been suggested for the dispersion of sprays. The mechanism of particle dispersion due to the interaction with small vortices was quite different from that due to the interaction with a large vortex. A new improved equation of particle or droplet motion has been demonstrated to be superior to the previously proposed equations of particle motion. The droplet heating study showed the very significant response of the Nusselt number to vortical disturbances. The new computations with thermocapillary effects showed another coupling of the fluid motion to the thermal field.
- Fluid Mechanics