Accession Number : ADA303507

Title :   Breakup and Turbulence Generation in Dense Sprays.

Descriptive Note : Final technical rept. 15 Aug 93-14 Aug 95,

Corporate Author : MICHIGAN UNIV ANN ARBOR

Personal Author(s) : Hsiang, L. P. ; Wu, J. S. ; Chou, W. H. ; Chen, J. H. ; Faeth, G. M.

PDF Url : ADA303507

Report Date : 30 SEP 1995

Pagination or Media Count : 109

Abstract : Single and double pulse holography was used to measure the outcomes of secondary drop breakup after shock wave disturbances in air at normal temperature and pressure; the resulting drop breakup regimes and drop size and velocity distributions were successfully interpreted and correlated based on phenomenalogical analysis. Laser velocimetry was used to measure the properties of sphere wakes at moderate Reynolds numbers (less than 1000) in turbulent environments (relative turbulence intensities in the range 2.109.5%); it was found that velocity distributions in these wakes could be correlated as laminar like turbulent wakes with effective turbulent visd6sities that were simple functions of sphere Reynolds numbers and relative turbulence intensities. A stochastic analysis of turbulence generation by particles (drops) was evaluated using earlier laser velocimetry measurements for dispersed multiphase flows; it was found that velocity fluctuations could be estimated reasonably well based on stochastic synthesis of randomly arriving particle (drop) wakes using Campbell's theorem.

Descriptors :   *SPRAYS, *LASER VELOCIMETERS, *MULTIPHASE FLOW, MEASUREMENT, PARTICLE SIZE, STOCHASTIC PROCESSES, DISPERSING, SHOCK WAVES, TURBULENCE, FLOW VISUALIZATION, HOLOGRAPHY, DROPS, HIGH DENSITY, WAKE, REYNOLDS NUMBER.

Subject Categories : Fluid Mechanics
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE