Distinction of Coal Dust Particles from Liquid Droplets by Variations in Azimuthal Light Scattering

AbstractThe investigations of light scattering by larger meteoritic and terrestrial single grains (size range 20 μm to 120 μm ) demonstrate that the scattering properties of irregularly shaped dark opaque particles with very rough surfaces resemble the characteristic features of the empirical scattering function as derived from measurements of the zodiacal light. Purely transparent or translucent irregularly shaped particles show a quite different scattering behaviour. Furthermore irregular and multicomponent fluffy particles in the size range of a few microns were modelled by microwave analog measurements in order to explain positive and negative polarization of the light scattered by cometary dust grains.

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Laboratory Measurements of Light Scattering by Dust Particles

International Astronomical Union Colloquium ◽

10.1017/s0252921100501948 ◽

1996 ◽

Vol 150 ◽

pp. 409-413

Author(s):

Patrick P. Combet ◽

Philippe L. Lamy

Keyword(s):

Light Scattering ◽

Laser Beam ◽

Mie Theory ◽

Spherical Particles ◽

Dust Particles ◽

Laboratory Measurements ◽

Scattering Function ◽

Hene Laser ◽

Set Up ◽

Good Agreement

AbstractWe have set up an experimental device to optically study the scattering properties of dust particles. Measurements over the 8 — 174° interval of scattering angles are performed on a continuously flowing dust loaded jet illuminated by a polarized red HeNe laser beam. The scattering is averaged over the population of the dust particles in the jet, which can be determined independently, and give the “volume scattering function” for the two directions of polarization directly. While results for spherical particles are in good agreement with Mie theory, those for arbitrary particles show conspicuous deviations.

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Light scattering by irregular interplanetary dust particles

Earth Planets and Space ◽

10.1186/bf03352151 ◽

1998 ◽

Vol 50 (6-7) ◽

pp. 577-585 ◽

Cited By ~ 22

Author(s):

Hajime Okamoto ◽

Yu-lin Xu

Keyword(s):

Light Scattering ◽

Interplanetary Dust ◽

Dust Particles ◽

Interplanetary Dust Particles

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A VGGNet-like approach for classifying and segmenting coal dust particles with overlapping regions

Computers in Industry ◽

10.1016/j.compind.2021.103506 ◽

2021 ◽

Vol 132 ◽

pp. 103506

Author(s):

Zheng Wang ◽

Xu Zheng ◽

Dongyan Li ◽

Helin Zhang ◽

Yi Yang ◽

...

Keyword(s):

Coal Dust ◽

Dust Particles

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COMBUSTION OF A GAS SUSPENSION OF COAL DUST IN A SWIRLING FLOW

Vestnik Tomskogo gosudarstvennogo universiteta Matematika i mekhanika ◽

10.17223/19988621/71/11 ◽

2021 ◽

pp. 139-147

Author(s):

K.M. Moiseeva ◽

◽

A.Yu. Krainov ◽

E.I. Rozhkova ◽

◽

...

Keyword(s):

Flow Velocity ◽

Swirling Flow ◽

Coal Dust ◽

Combustion Efficiency ◽

Dust Particles ◽

Gas Temperature ◽

Flow Swirl ◽

Angular Component ◽

Air Suspension ◽

The Impact

Swirling combustion is currently one of the most important engineering problems in physics of combustion. There is a hypothesis on the increase in the combustion efficiency of reacting gas mixtures in combustion chambers with swirling flows, as well as on the increase in the efficiency of fuel combustion devices. In this paper, it is proposed to simulate a swirling flow by taking into account the angular component of the flow velocity. The aim of the study is to determine the effect of the angular component of the flow velocity on the characteristics of the flow and combustion of an air suspension of coal dust in a pipe. The problem is solved in a twodimensional axisymmetric approximation with allowance for a swirling flow. A physical and mathematical model is based on the approaches of the mechanics of multiphase reacting media. A solution method involves the arbitrary discontinuity decay algorithm. The impact of the flow swirl and the size of coal dust particles on the gas temperature distribution along the pipe is determined.

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