The deposition of airborne droplets on wire gauzes

Jarman, Rt

doi:10.1016/0009-2509(59)80061-0

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…The collection efficiency by inertial impaction, E I , is calculated for potential flow and the comparisons are shown in Figure 7a. When aerosol inertia is negligible, similar computations for both viscous and potential flows are performed to estimate the interception efficiency E R and the results are also compared with the previous theoretical studies (Ranz and Wong 1952;Fuchs 1964;Friedlander 1957), with the results shown in Figure 7b, where the interception parameter is defined as Figure 7a indicates that when inertial impaction is the dominant mechanism for aerosol collection, the efficiency curve of the present calculation agrees well with the test data by the previous studies (Ranz and Wong 1952;Jarman 1959;Walton and Woolcock 1960;Schmidt and L€ offler 1993), while the predicted curve obtained by Slinn's formula (Slinn 1983;Seinfeld and Pandis 2006) underestimates the inertial collection efficiency. Figure 7b shows that the calculations of interception efficiencies in this study, for both the viscous and the potential flows, are in good agreement with those of theoretical predictions (Fuchs 1964;Friedlander 1957;Ranz and Wong 1952).…”

Section: Validations Of Computational Methodssupporting

confidence: 82%

“…Numerous studies have been conducted to investigate the capture of particles on spherical collectors by the mechanisms of inertial impaction and interception (Ranz and Wong 1952;Jarman 1959;Walton and Woolcock 1960;Schmidt and L€ offler 1993;Fuchs 1964;Friedlander 1957;Slinn 1983). The numerical model used in this study is validated against the results mentioned above, including experimental data and theoretical predictions, and the results are shown in Figure 7.…”

Section: Validations Of Computational Methodsmentioning

confidence: 99%

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Numerical analysis of the dynamics of aerosol inertial collection and aggregation on raindrops

Zhu

Hua

Kang

et al. 2017

Aerosol Science and Technology

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A three-dimensional stochastic model is developed for predicting atmospheric aerosol collection and aggregation on the surface of a falling raindrop at its terminal velocity. Potential flow and viscous flow are assumed as the flow fields in the vicinity of the large and the small raindrops, respectively. The results show that hydrophobic coarse mode aerosols collected by either small raindrops (d c < 100 mm) or large drops (d c > 100 mm) form aggregations on the surfaces of drops, and accumulation mode aerosols tend to be captured by the aggregations or hydrophobic coarse particles which have been collected by the drops, and this may significantly enhance the capability of the raindrop for fine aerosol collection. When the aggregation effect is considered in the calculation, fine aerosol efficiency can be promoted by one to two orders of magnitude. Therefore, fine particle collision efficiency by raindrops is underestimated by employing the classical dynamic theory which neglects the particle aggregation effect. However, the collection efficiency of coarse particles remains almost constant with the increase in the amount of particles collected by large drops, while there is only a slight increase in efficiency by small raindrops upon increasing in particle concentration. This implies that the traditional limiting trajectory method can still be used for the calculation of coarse particle collection efficiencies by either small or large raindrops.

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Section: Validations Of Computational Methodssupporting

confidence: 82%

Section: Validations Of Computational Methodsmentioning

confidence: 99%

Numerical analysis of the dynamics of aerosol inertial collection and aggregation on raindrops

Zhu

Hua

Kang

et al. 2017

Aerosol Science and Technology

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“…This is probably mainly due to the different aerodynamic assumptions made. By comparing equations (10) and (11) it can be shown that n = 0 is more critical than rc^O unless 12 ( 1 -v 2 ) (I)" (12) For a shell with a /h = 400 this implies n^3 6 and for this number of circumferential waves the circumferential mode is essentially circular anyway.…”

Section: -{(R)'[»•-"-]-(t)"["•-»-]}'mentioning

confidence: 99%

Supersonic Flutter of a Cylindrical Panel in an Axi–Symmetric Mode

Johns

1960

J. R. Aeronaut. Soc.

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In ref. 1 an extensive review was made of the panel flutter problem and analyses dealing with flutter of cylindrical shells of finite length were discussed in considerable detail. It was stated that one of the central points of controversy is in the choice of the appropriately simplified governing equations for the thin–walled elastic shell. Related to this is the choice of flutter mode and the question as to how the critical flutter speed depends upon the number of circumferential and axial waves in that mode.Stepanov and Strack and Holt found that the critical Mach number decreases with increasing number of circumferential waves, and Fung has concluded that the axially symmetric mode is of the greatest interest.The purpose of this note is to present a relatively simple analysis in which only axi–symmetric deformations of the shell are considered. The shell is assumed to be unreinforced longitudinally.

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