Particle Diagnostics in Optically Thick Sprays
Final rept. 15 Aug 1990-29 Feb 1992,
ARIZONA STATE UNIV TEMPE DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
Pagination or Media Count:
The results of a one-year research effort addressing some fundamental scientific issues relevant to particle diagnostics in optically-thick sprays are presented. The objective of this research effort involved development and application of an experimental apparatus for studying scattering in optically thick media. The important technical contributions of this project included 1 development of a fluidized bed approach for creating controlled optically thick media, and 2 characterization of performance of multi-element detectors and light-valve arrays. With respect to the former, we have developed a binary- particle-phase fluidized bed concept combined with refractive-index matching that will allow the bed to be fluid-dynamically very dense with interparticle spacings on the order of two diameters as required for stable operation but optically less thick with interparticle spacings greater than five diameters where independent, as opposed to dependent, multiple scattering is in effect. Conditions for stable operation of the binaryparticle-phase fluidized bed have been identified. Regarding detector and light-valve arrays, the experimental results indicated that edge effects are important and that current-generation Faraday-effect light valve arrays do not have the performance specifications required for use in multi-angle interrogation schemes for diagnostics in optically thick sprays.
- Particle Accelerators