Development of a Technique to Determine the Morphology and Dynamics of Agglomerates in Chemically Reacting Flows.
Abstract
An exact formulation was developed for the prediction of the internal electric field of an assembly of Rayleigh particles exposed to an incident radiation field which: (1) satisfies the energy conservation; (2) accounts for self contribution and multiple scattering effects; (3) is invariant to coordinate transformation and (4) is particularly useful for soot diagnostics. Based on this formulation a computer code (AGGL) was written for the computation of extinction, total scattering efficiency factors, and differential scattering intensities for agglomerates. The computations were free of error and resulted in tenfold reduction in computational time. Agglomerates with straight chain configuration were generated in a diffusion carbon/monoxide/air flame seeded with iron pentacarbonyl vapor. Both the primary particle size and the aspect ratio were found to be strong functions of the vapor concentration and aggregate residence time. X-ray diffraction measurements revealed that the particles consisted predominantly of iron oxide(Fe2O3). In situ measurements of the particle dynamics using polarized and depolarized light scattering showed that the signal to noise ratio was significantly improved when measurements were carried out in the cross correlation mode. It was also found that monitoring of the particle dynamics was possible with sampling times as low as 25 nanoseconds.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 13, 1997
- Accession Number
- ADA322767
Entities
People
- Tryfon Charalampopoulos
Organizations
- Louisiana State University