Accession Number : ADA299578

Title :   Drop1et-Turbu1ence Interactions Over A Wide Spectra1 Range.

Descriptive Note : Progress rept. 1 Nov 94-31 Aug 95,

Corporate Author : CALIFORNIA UNIV IRVINE DEPT OF MECHANICAL AND AEROSPACE ENGINEERING

Personal Author(s) : Sirignano, William A. ; Elghobashi, Said E. ; Kim, Inhul ; Masoudi, M.

PDF Url : ADA299578

Report Date : 01 SEP 1995

Pagination or Media Count : 56

Abstract : In the last year, the unsteady, three-dimensional, incompressible, viscous flow interactions between a pair of vortex tubes advected by a uniform free stream and a spherical particle held fixed in space was 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 have been obtained and reported. A new mechanism based upon droplet lift has been suggested for the dispersion of sprays. Interactions with an array of vortices have resulted in predictive capabilities useful for the study of droplet dispersion in a spray. The case of large vortex-to- droplet diameter has been studied showing that droplet deflection increases with vortex size. The investigation for the heat and mass transfer of a droplet interacting with vortex tubes showed significant sensitivity to the configuration of the interaction. Nusselt numbers were modified from their axisymmetric values.

Descriptors :   *TURBULENCE, *VORTICES, *DROPS, *SPRAYS, VELOCITY, HEAT TRANSFER, PRESSURE GRADIENTS, COMPUTERIZED SIMULATION, DISPERSING, DEFLECTION, TURBULENT FLOW, MOMENTS, COMPUTATIONAL FLUID DYNAMICS, FINITE DIFFERENCE THEORY, GAS TURBINES, CORRELATION, FLOW FIELDS, TEMPERATURE GRADIENTS, MASS TRANSFER, WAKE, UNSTEADY FLOW, DRAG, LIFT, NAVIER STOKES EQUATIONS, FREE STREAM, VISCOUS FLOW, REYNOLDS NUMBER, INCOMPRESSIBLE FLOW, VAPORIZATION, SHEAR FLOW, THREE DIMENSIONAL FLOW, AXISYMMETRIC FLOW.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE