Polarized light scattering techniques for fractal like soot characterisation

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Polarized light scattering techniques for fractal like soot characterisation

Cignoli, F. / Zizak, G. / De Iuliis, S. / di Stasio, S. / Istituto Motori C.N.R. Via Marconi 8 / Istituto Tecnologia Materiali e Processi Energetici TeMPE -

Abstract

Object of the experimental study presented in this paper is the investigation about the possibility of recognize in-situ and by all-scattering techniques some structural features of clustered soot in flame. The linear polarization state of both incident and scattered light is varied to detect patterns of both co-polarized and cross-polarized light as function of the polar angle . From the vertical-vertical scattered light intensitiees Ivv plotted in term of the wave quantum vector modulus q, we determine the mass fractal dimensions DF and the radius of gyration Rg of soot clusters growing in flames. The results obtained burning different fuels are compared. The long-range fractal information of the morphology of the clusters represented by DF is complemented by the measurements of the depolarized light in correspondence of both horizontal and vertical linear polarization of the incident light. The vertical depolarization ratio Ïv is demonstrated as very sensitive indicator of the short-range interactions which are established between neighbouring primary particles at the onset of the agglomeration phase where the fractal self-similarity does not yet hold. The Krishnan''s ratios IHV/IVH are measured at angles variable from 15Â° to 160Â° and are demonstrated to be as well a fruitful indication of cluster shape at the very beginning of the agglomeration process.

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Dokumentinformationen

Titel :

Polarized light scattering techniques for fractal like soot characterisation

Beteiligte:

Cignoli, F. (Autor:in) / Zizak, G. (Autor:in) / De Iuliis, S. (Autor:in) / di Stasio, S. (Autor:in) / Istituto Motori C.N.R. Via Marconi 8 / Istituto Tecnologia Materiali e Processi Energetici TeMPE -

Erschienen in:

Sae Technical Paper Series

Erscheinungsdatum :

1999

ISSN :

0148-7191

DOI :

https://doi.org/10.4271/1999-24-0007

Medientyp :

Aufsatz (Konferenz)

Format :

Sprache :