Accession Number : ADP009034

Title :   An Evaluation on the Use of Large, Hollow Micro-Balloons as LDV Seed Particles,

Corporate Author : AEROMETRICS INC SUNNYVALE CA

Personal Author(s) : Sankar, S. V. ; Kamemoto, D. Y. ; Bachalo, W. D.

Report Date : 23 JUL 1992

Pagination or Media Count : 9

Abstract : A combined theoretical and experimental study has been conducted to evaluate the effectiveness of using large, hollow micro-balloons as LDV seed particles. The study has focused on the ability of phase Doppler systems to size hollow micro-balloons, the ability of large micro-balloons to respond to high frequency, spatial and temporal flow field variations, and the overall advantages and disadvantages of using large micro-balloons instead of conventional LDV seed particles, such as very small water droplets or polystyrene latex (PSL) particles. This paper discusses the development of a theoretical phase Doppler response model for stratified spheres, a dynamic response model to describe particle behavior in fluid-flows, the experimental facility, and the theoretical and experiment results. (Author)

Descriptors :   *LASER VELOCIMETERS, *MICROSPHERES, PARTICLE SIZE, FLOW FIELDS, SPATIAL DISTRIBUTION, SIGNAL TO NOISE RATIO, LIGHT SCATTERING, POLYSTYRENE, LOW FREQUENCY, OPTICAL CROSS SECTIONS, SIGNAL PROCESSING, ACCURACY, EXPERIMENTAL DATA, COMPARISON, PHASE STUDIES, HIGH RESOLUTION, BACKSCATTERING.

Subject Categories : Fluid Mechanics
      Optical Detection and Detectors
      Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE