Coulomb Interactions in Soot Particle Formation

Onischuk, A. A.; Stasio, S. di; Baklanov, A.; Карасев, В. Е.; Makhov, G. A.; Vlasenko, A.; Ankilov, A. N.; Panfilov, V. N.

doi:10.1016/s0021-8502(01)00084-2

Cited by 5 publications

(4 citation statements)

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“…It is around to the residence time in the combustor and postcombustor flow, which is closed to t res y 10 22 s. Positive and negative soot particles have been observed also in propane and acetylene flames. [20][21][22] The concentrations of the positive and negative ions at the nozzle exit are approximately equal as it has been estimated recently by Starik et al 12 for the cruise and ground regimes. The ions concentration in the aero engine combustors have not been measured, although limited data on the ion measurements in an aircraft plume have been reported.…”

Section: Model Of Ion-ion and Ion-soot Interaction In The Plumesupporting

confidence: 58%

Ion–soot interaction: a possible mechanism of ion removal in aircraft plume

Popovicheva

Persiantseva

Starik

et al. 2003

J. Environ. Monitor.

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The phenomenon of the ion-soot interaction in the aircraft plume at the ground conditions is investigated. The ion-soot attachment coefficients, taking into account the polarization of the soot particles in the ion electric field, are calculated. It is shown that the ion-soot attachment may play the important role in the evolution of the ion concentrations in the plume. Comparison of the model results with the ground-based measurements for the ion depletion along the plume demonstrates that the concentration of the positive and negative ions at the nozzle exit for these observations is close to 1.2 x 10(8) cm(-3).

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Section: Model Of Ion-ion and Ion-soot Interaction In The Plumesupporting

confidence: 58%

Ion–soot interaction: a possible mechanism of ion removal in aircraft plume

Popovicheva

Persiantseva

Starik

et al. 2003

J. Environ. Monitor.

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“…Collisions between micrometer sized charged particles/dust grains have a large influence on the behavior of many colloidal [1], aerosol [2,3], granular [4][5][6], and dusty plasma [7][8][9] systems. For example, in fluidized beds, dust storms, and volcanic plumes, particle-particle collisions lead to charge exchange (even for identical chemical composition particles [4,[10][11][12]), which can significantly alter the behavior of a particle-laden flow [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Collision rate coefficient for charged dust grains in the presence of linear shear

Hui

Hogan

2017

Phys. Rev. E

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Like and oppositely charged particles or dust grains in linear shear flows are often driven to collide with one another by fluid and/or electrostatic forces, which can strongly influence particle-size distribution evolution. In gaseous media, collisions in shear are further complicated because particle inertia can influence differential motion. Expressions for the collision rate coefficient have not been developed previously which simultaneously account for the influences of linear shear, particle inertia, and electrostatic interactions. Here, we determine the collision rate coefficient accounting for the aforementioned effects by determining the collision area, i.e., the area of the plane perpendicular to the shear flow defining the relative initial locations of particles which will collide with one another. Integration of the particle flux over this area yields the collision rate. Collision rate calculations are parametrized as an enhancement factor, i.e., the ratio of the collision rate considering potential interactions and inertia to the traditional collision rate considering laminar shear only. For particles of constant surface charge density, the enhancement factor is found dependent only on the Stokes number (quantifying particle inertia), the electrostatic energy to shear energy ratio, and the ratio of colliding particle radii. Enhancement factors are determined for Stokes numbers in the 0-10 range and energy ratios up to 5. Calculations show that the influences of both electrostatic interactions and inertia are significant; for inertialess (St=0) equal-sized and oppositely charged particles, we find that even at energy ratios as low as 0.2, enhancement factors are in excess of 2. For the same situation but like-charged particles, enhancement factors fall below 0.5. Increasing the Stokes number acts to mitigate the influence of electrostatic potentials for both like and oppositely charged particles; i.e., inertia reduces the enhancement factor for oppositely charged particles and increases it for like-charged particles. Uniquely, at elevated Stokes numbers with attractive potentials we find collisionless "pockets" within the collision area, which are regions completely bounded by the collision area but within which collisions do not occur. Regression equations to results are provided, enabling calculation of the enhancement factor as a function of energy ratio and Stokes number. In total, this study both leads to insight into the collision dynamics of finite-inertia, charged particles in shear flows, and provides a means to simply calculate the particle-particle collision rate coefficient.

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“…Measurements indicate that in the hottest zone, soot particles may be charged according to equilibrium, (see, for example, Lawton and Weinberg, 1969) but this is not always the case and the initial particle charge seems to depend upon the material burnt (Burtscher et al, 1986). It is interesting to note that the net charge of soot particles in flames was found to be positive (Onischuk et al, 2001) even in the flame region where a large excess of electrons exists. In the combustor of an aircraft engine, it is expected that CI are formed and interact with soot particles in the same way as in laboratory flames, however the whole spectrum of observed CI (both positive and negative) is much wider than in the case of laboratory flames (Kiendler et al, 2000a, b;Kiendler and Arnold, 2001).…”

Section: Introductionmentioning

confidence: 99%

Emission of ions and charged soot particles by aircraft engines

Sorokin¹,

Vancassel²,

Mirabel³

2002

Preprint

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Abstract. In this article, a model which examines the formation and evolution of chemiions in an aircraft engine is proposed. This model which includes chemiionisation, electron thermo-emission, electron attachment to soot particles and to neutral molecules, electron-ion and ion-ion recombination, ion-soot interaction, allows the determination of the ion concentration at the exit of the combustor and at the nozzle exit of the engine. It also allows the determination of the charge of the soot particles. A comparison of the model results with the available ground-based experimental data obtained on the ATTAS research aircraft engines during the SULFUR experiments (Schumann, 2002) shows an excellent agreement.

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Coulomb Interactions in Soot Particle Formation

Cited by 5 publications

References 0 publications

Ion–soot interaction: a possible mechanism of ion removal in aircraft plume

Ion–soot interaction: a possible mechanism of ion removal in aircraft plume

Collision rate coefficient for charged dust grains in the presence of linear shear

Emission of ions and charged soot particles by aircraft engines

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