Three-dimensional numerical simulation of the deposition of polydisperse aerosol particles on filter fibres — extended concept and preliminary results

Baumgartner, Hanspeter; Löffler, Friedrich

doi:10.1016/0021-8502(87)90147-9

Cited by 15 publications

(2 citation statements)

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“…(Periodic boundary conditions are introduced in order to avoid edge effects arising from the finite width of the lattice.) We decided to carry out our initial simulations under these simplifying assumptions (i.e., twoand three-dimensional "on-lattice" as opposed to three-dimensional "off-lattice") because a) There is already evidence in the literature that in both cases the qualitative behavior is the same (compare, e.g., Meakin et al, 1986;Baumgartner and Loffler, 1987;Houi and Lenormand, 1984). b) A sufficiently detailed description of the resulting microstructure would be prohibitively time-consuming for deposits grown off-lattice.…”

Section: The Algorithmmentioning

confidence: 99%

Simulation of microstructure/mechanism relationships in particle deposition

1989

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The important connection between particulate deposit properties and deposition mechanism remains poorly understood and only scarcely studied. Accordingly, in this research, we develop a discrete stochastic model to simulate particulate deposition processes resulting from realistic combinations of deposition mechanisms. Particle motion is assumed to be determined by the superposition of a deterministic force that acts toward the collecting surface and a random force, which produces Brownian diffusion. We characterize the resulting deposit microstructure via porosity and pore sizelarea distribution, surface area; and we examine the evolution of these descriptors with time (number of particles deposited) for different deposition mechanisms. We also examine the effect of particle polydispersity, spatial orientation (for nonspherical particles), and mean-free-path on the resulting deposit structure.

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Section: The Algorithmmentioning

confidence: 99%

Simulation of microstructure/mechanism relationships in particle deposition

1989

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“…More realistic structures of dendrites were obtained from the Monte Carlo simulations of the growing process of particle dendrites on a fiber, as proposed by Kanaoka et al (1980). Baumgartner and Löffler (1987) demonstrated the three-dimensional structures of deposited polydisperse aerosol particles obtained from the numerical simulations. These papers present only qualitative pictures of deposits.…”

Section: Introductionmentioning

confidence: 99%

Energy-Balanced Oscillatory Model for Description of Particles Deposition and Re-Entrainment on Fiber Collector

Przekop

Grzybowski

Gradoń

2004

Aerosol Science and Technology

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The pattern of filling of the internal space in fibrous filters strongly influences the behavior of the filter at the stage of nonsteady-state deep bed filtration. The model of single-fiber loading with deposited particles, including the resuspension effect, is presented. Structures of deposited charged particles from the range of diameters 0.01-10 µm deposited on the electret fiber of diameter 30 µm were calculated. Results of calculations indicate that the distribution of deposits around the fiber depend on particle size. Fractal dimension and local porosity of deposits depend on the predominant mechanism of deposition. The incorporation of the resuspension effect into the deposition models shows significant differences of the geometry of dendrites in comparison with the case of model in which resuspension was neglected. INTRODUCTIONThe rational design of filtration process should be based on reliable predictions of the dependence on the effluent concentration and on the pressure drop variations with time for a given set of the operating conditions, i.e., particle concentration and size, filter packing density, size of filter element, gas velocity, etc. The pattern of filling of the internal space with the porous structure of fibrous filters strongly influences the behavior of the filter at the stage of nonsteady-state filtration. The initial deposition of particles on the clean collector (nucleation) and dendrite deposition in the next step of the process determine the properties of filters.The knowledge of a dynamics of dendrite growth can provide important information about the structure of clustering particles collected on a single fiber of the filter. It is especially impor-

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Porous Media and Filtration

Miguel

2004

Emerging Technologies and Techniques in Porous Media

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Three-dimensional numerical simulation of the deposition of polydisperse aerosol particles on filter fibres — extended concept and preliminary results

Cited by 15 publications

References 2 publications

Simulation of microstructure/mechanism relationships in particle deposition

Simulation of microstructure/mechanism relationships in particle deposition

Energy-Balanced Oscillatory Model for Description of Particles Deposition and Re-Entrainment on Fiber Collector

Porous Media and Filtration

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