Filtration of Fine Particles by Multiple Liquid Droplet and Gas Bubble Systems

Jung, Chang Hoon; Lee, K. W.

doi:10.1080/02786829808965578

Cited by 63 publications

(46 citation statements)

References 10 publications

(17 reference statements)

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“…The total CE is the sum of these processes. The CE due to Brownian diffusion, interception and inertial impaction are based on Park et al (2005), which expands on Jung and Lee (1998 Davenport and Peters (1978). The efficiencies used here are…”

Section: Theoretical Ce Modelsmentioning

confidence: 99%

Laboratory studies of collection efficiency of sub-micrometer aerosol particles by cloud droplets on a single-droplet basis

2015

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Abstract. An experimental setup has been constructed to measure the collection efficiency (CE) of sub-micrometer aerosol particles by cloud droplets. Droplets of a dilute aqueous ammonium sulfate solution with an average radius of 21.6 µm fall freely into a chamber and collide with sub-micrometer polystyrene latex (PSL) sphere particles of known sizes and concentrations. Two relative humidity (RH) conditions, 15 ± 3 % and 88 ± 3 %, hereafter termed "low" and "high", respectively, were varied with different particles sizes and concentrations. After passing through the chamber, the droplets and aerosol particles were sent to the Particle Analysis by Laser Mass Spectrometry (PALMS) instrument to determine chemical compositions on a single-droplet basis. "Coagulated droplets" (droplets that collected aerosols) had mass spectra that contained signatures from both an aerosol particle and a droplet residual. CE values range from 2.0 × 10 −1 to 1.6 for the low-RH case and from 1.5 × 10 −2 to 9.0 × 10 −2 for the high-RH case. CE values were, within experimental uncertainty, independent of the aerosol concentrations. CE values in this study were found to be in agreement with previous experimental and theoretical studies. To our knowledge, this is the first collection experiment performed on a single-droplet basis with atmospherically relevant conditions such as droplet sizes, droplet charges and flow.

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Section: Theoretical Ce Modelsmentioning

confidence: 99%

Laboratory studies of collection efficiency of sub-micrometer aerosol particles by cloud droplets on a single-droplet basis

2015

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“…The scheme for collection efficiency given in Park et al (2005) considers the collection mechanisms of Brownian diffusion, interception, and inertial impaction. The Brownian diffusion and interception formulas are based on Jung and Lee (1998) and the treatment of inertial impaction comes from Calvert (1984). By contrast, Croft et al (2009) divided the raindrop collectors and the collected particles into different size ranges (i.e., >300, 300-42, 42-10, ≤10 µm for collectors, >10, 10-0.5, 0.5-0.2, ≤0.2 µm for collected particles) and calculated the collection efficiencies between collectors and collected particles of different sizes using a look-up table modified from Hall (1980).…”

Section: Sensitivity To Collection Efficiencymentioning

confidence: 99%

Uncertainty assessment of current size-resolved parameterizations for below-cloud particle scavenging by rain

Wang¹,

2010

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Abstract. Current theoretical and empirical size-resolved parameterizations of the scavenging coefficient ( ), a parameter commonly used in aerosol transport models to describe below-cloud particle scavenging by rain, have been reviewed in detail and compared with available field and laboratory measurements. Use of different formulations for raindropparticle collection efficiency can cause uncertainties in sizeresolved values of one to two orders of magnitude for particles in the 0.01-3 µm diameter range. Use of different formulations of raindrop number size distribution can cause values to vary by a factor of 3 to 5 for all particle sizes. The uncertainty in caused by the use of different droplet terminal velocity formulations is generally small than a factor of 2. The combined uncertainty due to the use of different formulations of raindrop-particle collection efficiency, raindrop size spectrum, and raindrop terminal velocity in the current theoretical framework is not sufficient to explain the one to two order of magnitude under-prediction of for the theoretical calculations relative to the majority of field measurements. These large discrepancies are likely caused by additional known physical processes (i.e, turbulent transport and mixing, cloud and aerosol microphysics) that influence field data but that are not considered in current theoretical parameterizations. The predicted size-resolved particle concentrations using different theoretical parameterization can differ by up to a factor of 2 for particles smaller than 0.01 µm and by a factor of >10 for particles larger than 3 µm after 2-5 mm of rain. The predicted bulk mass and number concentrations (integrated over the particle size distribution) can differ by a factor of 2 between theoretical and empirical parameterizations after 2-5 mm of moderate intensity rainfall.

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“…The collection efficiency due to inertial impaction depends on the Stokes number which represents inertial force, and increased with increasing droplet size and relative velocity. Collection efficiency due to interception increases with decreasing droplet size and increasing number concentration (Lim et al, 2006;Jung et al, 1998).…”

Section: Effects Of Electrospraymentioning

confidence: 99%

Experimental Study on the Enhancement of Particle Removal Efficiency in Spray Tower Scrubber Using Electrospray

Kim¹,

Kim²,

Lee³

et al. 2014

Asian J. Atmos. Environ

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There have been a lot of efforts to keep permissible emission standards and to reduce the amount of emitted air pollutants. There are several air pollution control equipments, however, wet scrubber is used to remove particulate matters and gaseous pollutants simultaneously, even if it has low collection efficiency in the particle size less than 5.0 μm. To overcome this problem, we introduced a spray tower scrubber with an electrospray system which a high voltage was indirectly applied. We found that collection efficiency of fine particles in the electrospray system was improved by increasing electrical field strength and the ratio of liquid-gas flow rate (from 41% to 84% for 0.3 μm particles). In addition, a number of small droplets generated from an electrospray system led high collection efficiency, resulting from electrostatic attraction between droplets and particles and higher collision frequency. Therefore, we can conclude that the introduction of an electrospray system is quite effective to increase the particle removal efficiency of a spray tower scrubber.

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Filtration of Fine Particles by Multiple Liquid Droplet and Gas Bubble Systems

Cited by 63 publications

References 10 publications

Laboratory studies of collection efficiency of sub-micrometer aerosol particles by cloud droplets on a single-droplet basis

Laboratory studies of collection efficiency of sub-micrometer aerosol particles by cloud droplets on a single-droplet basis

Uncertainty assessment of current size-resolved parameterizations for below-cloud particle scavenging by rain

Experimental Study on the Enhancement of Particle Removal Efficiency in Spray Tower Scrubber Using Electrospray

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