The formation of gum particles in coal-gas

Badger, E. H. M.; Dryden, I. G. C.

doi:10.1039/tf9393500607

Cited by 17 publications

(10 citation statements)

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“…The oscillatory behavior observed in the particle formation processes during the α-pinene experiment is characteristic of a continuous-flow system with a steady source of condensable material. It has been observed and explained previously (Badger and Dryden, 1939;McGraw and Saunders, 1984). The behavior can be understood by considering the competition for condensable material between the growth of pre-existing particles and the formation of new particles.…”

Section: α-Pinenementioning

confidence: 99%

Direct measurement of particle formation and growth from the oxidation of biogenic emissions

et al. 2006

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Abstract.A new facility has been developed to investigate the formation of new particles from the oxidation of volatile organic compounds emitted from vegetation. The facility consists of a biogenic emissions enclosure, an aerosol growth chamber, and the associated instrumentation. Using the facility, new particle formation events have been induced through the reaction of ozone with three different precursor gas mixtures: an α-pinene test mixture and the emissions of a Holm oak (Quercus ilex) specimen and a loblolly pine (Pinus taeda) specimen. The results demonstrate the variability between species in their potential to form new aerosol products. The emissions of Q. ilex specimen resulted in fewer particles than did α-pinene, although the concentration of monoterpenes was roughly equal in both experiments before the addition of ozone. Conversely, the oxidation of P. taeda specimen emissions led to the formation of more particles than either of the other two gas mixtures, despite a lower initial terpenoid concentration. These variations can be attributed to differences in the speciation of the vegetative emissions with respect to the α-pinene mixture and to each other. Specifically, the presence of β-pinene and other slower-reacting monoterpenes probably inhibited particle formation in the Q. ilex experiment, while the presence of sesquiterpenes, including β-caryophyllene, in the emissions of the P. taeda specimen were the likely cause of the more intense particle formation events observed during that experiment.

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Section: α-Pinenementioning

confidence: 99%

Direct measurement of particle formation and growth from the oxidation of biogenic emissions

et al. 2006

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“…Nonlinear effects during gas-to-particle conversion are perhaps best illustrated in a classic report (Badger and Dryden, 1939) of sustained oscillations in both size and number density of "gum" particles produced in reactions of simulated coal-gas mixtures with NO (and possibly trace amounts of NO, and 0,) present. These experiments were carried out in a large (10 cu.…”

Section: Introductionmentioning

confidence: 99%

A Condensation Feedback Mechanism for Oscillatory Nucleation and Growth

McGraw

Saunders

1984

Aerosol Science and Technology

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“…When performing flow chamber experiments, some special phenomena may occur that differ from the standard chamber studies: the movement of the carrier gas induces an oscillatory behavior in the aerosol size distribution dynamics when suitable condi- 15 tions are fulfilled. These oscillations were first noticed by Badger and Dryden back in the late 1930's, when they made a qualitative conclusion that the oscillation of the aerosol number concentration was a net result of nucleation and flow process in the volume (Badger and Dryden, 1939). Later, other scientists have reported similar results: Reiss et al (1977) observed oscillatory behavior in the nucleation rate of new 20 particles in a diffusion cloud chamber.…”

Section: Introductionmentioning

confidence: 78%

An aerosol dynamics model for simulating particle formation and growth in a mixed flow chamber

Vesterinen¹,

Korhonen²,

Joutsensaari³

et al. 2011

Preprint

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In this work we model the aerosol size distribution dynamics in a mixed flow chamber in which new particles are formed via nucleation and subsequent condensation of oxidation products of VOCs emitted from Norway spruce seedlings. The microphysical processes included in the model are nucleation, condensation, deposition and 5 coagulation. The aerosol dynamics in the chamber is a competition between aerosol growth and scavenging/deposition which results in a cyclic particle formation process. With a simple 1-product model, in which the formed gas is able to both condense to the particles and nucleate, we are able to catch both the oscillatory features of the particle formation process and the evolution of the number concentration in a reason-10 able way. The gas-phase chemistry was adjusted using pre-estimated reaction rate constant in the simulations and the particle deposition rate as a function of size was determined experimentally. Despite this, some of the essential features of the physical properties of the aerosol population could still be captured and investigated without the detailed knowledge of the physical processes underlying the problem by using the 15 constructed model. The size dependency of the wall loss coefficient was investigated using a slightly modified measurement set-up.

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The formation of gum particles in coal-gas

Cited by 17 publications

References 0 publications

Direct measurement of particle formation and growth from the oxidation of biogenic emissions

Direct measurement of particle formation and growth from the oxidation of biogenic emissions

A Condensation Feedback Mechanism for Oscillatory Nucleation and Growth

An aerosol dynamics model for simulating particle formation and growth in a mixed flow chamber

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