Transport Phenomena with Single Aerosol Particles

Davis, E. James

doi:10.1080/02786828308958618

Cited by 138 publications

(43 citation statements)

References 77 publications

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“…An earlier review by Davis (1983) documented the progress up to 1982. Since then, many interesting investigations have appeared in the literature.…”

Section: Single-particle Levitation Experimentsmentioning

confidence: 99%

Phase Transformation and Growth of Hygroscopic Aerosols

Tang¹

2000

Aerosol Chemical Processes in the Environment

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DISCLAIMERPortions of this document may be illegible in electronic image products. Images are produced from the best available original document. AbstractAmbient aerosols frequently contain large portions of hygroscopic inorganic salts such as chlorides, nitrates, and sulfates in either pure or mixed forms. Such inorganic salt aerosols exhibit the properties of deliquescence and efflorescence in air. The phase transformation from a solid particle to a saline droplet usually occurs spontaneously when the relative humidity of the atmosphere reaches a level specific to the chemical composition of the aerosol particle. Conversely, when the relative humidity decreases and becomes low enough, the saline droplet will evaporate and suddenly crystallize, expelling all its water content. The phase transformation and growth of aerosols play an important role in many atmospheric processes affecting air quality, visibility degradation, and climate changes. In this chapter, an exposition of the underlying thermodynamic principles is given, and recent advances in experimental methods utilizing singleparticle levitation are discussed. In addition, pertinent and available thermodynamic data, which are needed for predicting the deliquescence properties of single and multi-component aerosols, are compiled. This chapter is useful to research scientists who are either interested in pursuing further studies of aerosol thermodynamics, or required to model the dynamic behavior of hygroscopic aerosols in a humid environment.

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“…An earlier review by Davis (1983) documented the progress up to 1982. Since then, many interesting investigations have appeared in the literature.…”

Section: Single-particle Levitation Experimentsmentioning

confidence: 99%

Phase Transformation and Growth of Hygroscopic Aerosols

Tang¹

2000

Aerosol Chemical Processes in the Environment

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“…Our methods can be applied to solve this more complete thermophysical model. Yet another scenario important for aerosols (Davis 1983;Jacobson 1996;Friedlander 2000) and climate applications (Pruppacher & Klett 1997) is to consider what happens when a flow of air carrying supersaturated water vapour encounters a quiescent cold gas and condensation occurs. The resulting boundary layer flow should be similar to the case considered in this paper except for different boundary conditions at the 'wall' formed by the quiescent cold gas.…”

Section: Discussionmentioning

confidence: 99%

“…Gökoglu & Rosner (1986), Castillo & Rosner (1988, 1989, Filippov (2003) and Neu et al (2009) considered heterogeneous condensation in the case of diluted vapours in a carrier gas and a diluted suspension of solid particles upon which the vapour may condense. Castillo & Rosner (1988, 1989) study a simple thermophysical model in which the carrier gas is considered to be incompressible, the Soret and Dufour effects are ignored and the particles and droplets move towards the wall by thermophoresis (Davis 1983;Zheng 2002). Gökoglu & Rosner (1986) and Filippov (2003) deal with more complicated thermophysical models in which the carrier gas is compressible, its viscosity has an algebraic dependence on temperature and the Soret effect is included.…”

Section: Introductionmentioning

confidence: 99%

“…When there are solid particles in the carrier gas, the supersaturated vapours condense on them and they are carried to cold walls thermophoretically (Gökoglu & Rosner 1986;Castillo & Rosner 1988, 1989Neu, Bonilla & Carpio 2009). This heterogeneous condensation is important in aerosol formation (Davis 1983;Friedlander 2000;Peeters, Luijten & van Dongen 2001), fouling and corrosion in biofuel plants (Pyykönen & Jokiniemi 2003), outside vapour deposition processes used for making optical fibres (Filippov 2003;Tandon & Murtagh 2005), chemical vapour deposition, vapour condensation and aerosol capture by cold plates or rejection by hot ones (Rosner 2000).…”

Section: Introductionmentioning

confidence: 99%

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Theory of homogeneous vapour condensation and surface deposition from boundary layers

Camejo¹,

Bonilla²

2012

J. Fluid Mech.

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Homogeneous condensation of vapours mixed with a carrier gas in the stagnation point boundary layer flow near a cold wall is considered. There is a condensation region near the wall with supersaturated vapour. Assuming that the surface tension times the molecular area is much larger than the thermal energy far from the wall, droplets are nucleated exclusively in a narrow nucleation layer where the Zeldovich flux of clusters surpassing the critical nucleus size is at a maximum. The vapour condenses in the free molecular regime on the droplets, which are thermophoretically attracted to the wall. Unlike the narrow condensation region for heterogeneous condensation on solid particles, in the case of homogeneous condensation the condensation region is wide even when the rate of vapour scavenging by droplets is large. A singular perturbation theory of homogeneous vapour condensation in boundary layer flow approximates very well the vapour and droplet density profiles, the nucleation layer and the deposition rates at the wall for wide ranges of the wall temperature and the scavenging parameter B. A key point in the theory is to select a trial vapour number density profile among a one parameter family of profiles between an upper and a lower bound. The maximum of the Zeldovich flux for supercritical nuclei provides the approximate location of the nucleation layer and an approximate droplet density profile. Then the condensate number of molecules and the vapour density profile are calculated by matched asymptotic expansions that also yield the deposition rates. For sufficiently large wall temperatures, a more precise corrected asymptotic theory is given.

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“…A recent review by Davis (1983) on transport phenomena with single aerosol particles serves as an excellent reference to both experimental techniques and aerosol transport theories. More recently, have studied crystal nucleation from aqueous electrolyte solutions by determining the critical supersaturation at which a suspended solution droplet transforms into a salt crystal.…”

Section: Introductionmentioning

confidence: 99%

Growth Rate Measurements for Single Suspended Droplets Using the Optical Resonance Method

Richardson

Lin

McGraw

et al. 1986

Aerosol Science and Technology

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An experimental technique described with which the ing condensational growth is monitored with a tunable growth rate of a single solution droplet by water vapor dye laser for a particular optical resonance due to Mie condensation can be repeatedly measured with high prescattering. A consideration of the coupled heat and mass cision. The technique involves the use of an elechansfer processes during droplet growth indicates that hodynamic cell to suspend a NaCl solution droplet in the best agreement between theory and the experimental water vapor and a COz laser to momentarily perturb the results is obtained with a condensation coefficient close droplet-vapor equilibrium. The droplet size change durto unity.

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Transport Phenomena with Single Aerosol Particles

Cited by 138 publications

References 77 publications

Phase Transformation and Growth of Hygroscopic Aerosols

Phase Transformation and Growth of Hygroscopic Aerosols

Theory of homogeneous vapour condensation and surface deposition from boundary layers

Growth Rate Measurements for Single Suspended Droplets Using the Optical Resonance Method

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