Experimental Determination of the Initial Collection Efficiency of Granular Beds in the Inertial-Impaction-Dominated Region

Jung, Yongwon; Walata, S. A.; Tien, Chi

doi:10.1080/02786828908959309

Cited by 37 publications

(37 citation statements)

References 8 publications

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“…Inertial impaction in a granular bed has been then shown to be adequately correlated (D'Ottavio & Goren, 1983;Jung et al, 1989) in terms of the simpler problem of inertial impaction on a single "unit" spherical collector exposed to a uniform particle stream of an effective velocity, U eff ≡ Au s .…”

Section: Comparison To Experimentsmentioning

confidence: 99%

“…Impact on spherical collectors Jung et al (1989) have conducted experiments with monodisperse latex particles (1-5 m) impacting on glass beads (100-500 m) assembled into granular beds in the impaction dominated regime and have also compiled data of previous studies to derive useful correlations for the so-called capture efficiency of a single unit-collector (e.g. see Tien, 1989).…”

Section: Comparison To Experimentsmentioning

confidence: 99%

“…When considering an ensemble of collision events over a surface of prescribed geometry such as that of a spherical (Jung, Walata, & Tien, 1989;Cavenati & Coury, 1998) or cylindrical collector (Aylor & Ferrandino, 1985;Wang & John, 1988), it is convenient to introduce the notion of a "sticking fraction" S ≡ s , representing the overall fraction of impacting particles captured by the surface. In this way it is the ensemble averaging of the various collision events that gives rise to S values between 1 and 0 and sometimes, S itself is called the "sticking probability" or sticking coefficient.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Particle sticking/rebound criteria at oblique impact

Konstandopoulos

2006

Journal of Aerosol Science

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Section: Comparison To Experimentsmentioning

confidence: 99%

Section: Comparison To Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Particle sticking/rebound criteria at oblique impact

Konstandopoulos

2006

Journal of Aerosol Science

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“…Inertial force is a dominant collection mechanism at high filtration velocity, high particle density, and large particle size (Larbot et al 2003). The single collector efficiency, h I, is expressed in Equation (8) as suggested by Jung et al (1989) :…”

Section: Filtration Mechanismsmentioning

confidence: 99%

Preparation of Granular Ceramic Filter and Prediction of Its Collection Efficiency

Choi

Kim

et al. 2014

Aerosol Science and Technology

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The silicon carbide (SiC) ceramic filter is the most favorable component to remove particulate matter from hot flue gas due to its high filtration efficiency and high thermal durability. The effect of SiC powder size on the physical properties and filtration performance to prepare high-performance granular ceramic filter media was investigated in this study. Disk-type filter media were prepared by mixing ceramic components followed by physical compression and sintering. The porosity and average pore diameter in the filter media increased with increasing powder size. However, the mechanical strength decreased with increasing powder size, while it increased with increasing physical compressive force. The filter performance factor, q FM was introduced to evaluate the ceramic filter properties, and the SiC50 filter was the best of the ceramic filters prepared in this study. We also found that diffusion was a dominant collection mechanism for particles smaller than 0.7 mm, and direct interception and inertia were dominant collection mechanisms for particles larger than 0.7 mm in the SiC50 filter based on a single collector efficiency model. In addition, the predicted collection efficiencies showed reasonably good agreement with the experimental ones.

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“…Researchers have also proposed many different mathematical models for the GBF theory. 24,25 However, because the deep ltration of granular bed involves the uid mechanics theory of two-phase uid through the porous medium, it is really an extremely complicated physical process. Moreover, the ltration process of GBF has a certain randomness so that the experimental data is difficult to obtain accurately.…”

Section: -10mentioning

confidence: 99%

Studies of granular bed filter for dust removal in the process of coal pyrolysis by solid heat carrier

Zhang

Liang

et al. 2017

RSC Adv.

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Aiming at the optimization of the dust removal process in the poly-generation system of circulating fluidized bed (CFB) combustion/coal pyrolysis, a granular bed filter (GBF) is applied to the coal pyrolysis by solid heat carrier. By carrying out lab-scale experiments with a moving-bed pyrolyzer, the GBF model proposed by C. Tien et al. was used to describe the dust removal process of the dust-contained volatiles which has high temperature and high viscosity. The model applicability for real pyrolysis volatiles was verified. The results show that, the particle size distribution of the dust uncollected by the GBF is relatively concentrated. The majority particle size of uncollected dust is less than 20 mm, the mass fraction is $80%. The GBF is in a state of unsteady operation in the process of dust filtration. With the increase of operating time, the dust is gradually deposited in the GBF, then resulting in an increase of bed pressure drop. In the examined range, the calculational value of GBF efficiency is slightly lower than the experimental value. On the one hand, the filter media particles have a certain specific surface area, so that part of the dust-contained tar can be adsorbed on the filter media surface to achieve a better interception effect. On the other hand, the dust particle deposited in the GBF also plays an important role in dust capture. The C. Tien model results of the initial filtration efficiency can be used as the selection reference of the medium species and the physical properties of the GBF. The higher filter height, slower superficial gas velocity, and smaller size of medium are conducive to decrease the dust content in the pyrolysis products. This study can provide basic data for the dust removal process in the poly-generation system of CFB combustion/coal pyrolysis.

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Experimental Determination of the Initial Collection Efficiency of Granular Beds in the Inertial-Impaction-Dominated Region

Cited by 37 publications

References 8 publications

Particle sticking/rebound criteria at oblique impact

Particle sticking/rebound criteria at oblique impact

Preparation of Granular Ceramic Filter and Prediction of Its Collection Efficiency

Studies of granular bed filter for dust removal in the process of coal pyrolysis by solid heat carrier

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