=Paper=
{{Paper
|id=None
|storemode=property
|title=Sizing of soot aggregates by two-dimensional multi-angle light scattering (2D-MALS)
|pdfUrl=https://ceur-ws.org/Vol-865/Altenhoff.pdf
|volume=Vol-865
}}
==Sizing of soot aggregates by two-dimensional multi-angle light scattering (2D-MALS)==
<pdf width="1500px">https://ceur-ws.org/Vol-865/Altenhoff.pdf</pdf>
<pre>
                  Sizing of soot aggregates by
      two-dimensional multi-angle light scattering (2D-MALS)
                   Michael Altenhoff1, Jannis Reisky2, Stefan Will1
      1
      Lehrstuhl für Technische Thermodynamik, Universität Erlangen-Nürnberg, Germany
                  2
                   Technische Thermodynamik, Universität Bremen, Germany
                               stefan.will@ltt.uni-erlangen.de


        For the understanding of soot formation in combustion processes
comprehensive information about local size properties of complex soot aggregates is
desired. Elastic light scattering (ELS) is a well-established optical technique which
allows for the in situ determination of aggregate size and fractal dimension of soot
particles in flames [1]. Reimann et al. [2] used a two-dimensional combination of ELS
and laser-induced incandescence (LII) for the determination of various parameters of
soot particles in a premixed flame from a porous flat flame burner (McKenna type).
Although the general approach was successful both the measuring range in terms of
aggregate size and the information obtained were limited because of the use of a
fixed scattering angle of 90°.

        In continuation and extension of this approach we performed two-dimensional
ELS-measurements under various scattering angles thus allowing for a simultaneous
acquisition of particle parameters at various heights above burner (HAB).
Measurements on a premixed ethene flame from a McKenna type burner with an
equivalence ratio of 2.7 were carried out by irradiating a laser-light-section and
detecting the scattered light using an intensified CCD camera (cf. Fig 1). The
detection angle varied equidistantly in the scattering vector q from 17° to 163°, and
the evaluation of obtained data was carried out for each pixel line from 10 mm to
20 mm HAB for three different areas: the flame axis only, the area determined by the
depth of field and the maximum evaluable region. The obtained radii of gyration show
good agreement with former results.




Fig. 1: Experimental setup


[1]       C.M. Sorensen, Aerosol Sci. Technol. 35: 648-687 (2001)
[2]       J. Reimann, S.-A. Kuhlmann, S. Will, Appl. Phys. B 96: 583-592 (2009)



                5th international workshop on Laser-Induced Incandescence
                 May 9-11, 2012, Palais des Congrès, Le Touquet, France

</pre>