Modelling of deposition of flexible fractal-like aggregates on cylindrical fibre in continuum regime

Żywczyk, Ł.; Moskal, Arkadiusz

doi:10.1016/j.jaerosci.2014.12.002

Cited by 2 publications

(2 citation statements)

References 22 publications

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“…All harmonic functions were differentiated to give adequate forces acting on primary particles composing configurations. A detailed solution can be found in Appendix (Żywczyk and Moskal, 2015).…”

Section: Model Of the Inter-particle Interactionmentioning

confidence: 99%

“…The aim of this study was to investigate the subject with a new model, which constitutes an alternative way to simulate the dynamics of complex structures of fractal-like aggregates (Żywczyk and Moskal, 2015). The approach that has been presented in this study offers another mathematical description to study mechanical stability of complicated aggregate structures.…”

Section: Introductionmentioning

confidence: 99%

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Chemical and Process Engineering

Żywczyk,

Moskal,

Przekop

2019

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A flexible fractal-like aggregate model was used to study deformation and fragmentation of the structure of fractal-like aggregates via their impaction with rigid rough surface. Aggregates were conveyed one at the time towards a surface under vacuum conditions. The number of primary particles remaining in each fragment, ratio of average fragment radius of gyration after impaction to the average fragment initial radius of gyration and ratio of average coordination number to the initial coordination number were monitored for each individual aggregate. Results demonstrate that depending on the impact velocity, the fractal dimension of the aggregate, the strength of bonds between primary particles, the stiffness of the aggregate structure and the diameter of primary particle composing an aggregate, restructuring or breakage of the aggregate occur. Moreover, in the analysis of the ratio of coordination number of aggregates after impaction to the initial coordination number, three regimes were distinguished: first no deformation at low impact velocities, second restructurisation regime and finally fragmentation regime where partial or total fragmentation of aggregates was observed.

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Section: Model Of the Inter-particle Interactionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chemical and Process Engineering

Żywczyk,

Moskal,

Przekop

2019

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Estimation of Filtration Efficiency – from Simple Correlations to Digital Fluid Dynamics

Przekop

2017

Chemical and Process Engineering

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Aerosol filtration in fibrous filters is one of the principal methods of accurate removal of particulate matter from a stream of gas. The classical theory of depth filtration of aerosol particles in fibrous structures is based on the assumption of existing single fibre efficiency, which may be used to recalculate the overall efficiency of entire filter. Using “classical theory” of filtration one may introduce some errors, leading finally to a discrepancy between theory and experiment. There are several reasons for inappropriate estimation of the single fibre efficiency: i) neglecting of shortrange interactions, ii) separation of inertial and Brownian effects, ii) perfect adhesion of particles to the fibre, iv) assumption of perfect mixing of aerosol particles in the gas stream, v) assumption of negligible effect of the presence of neighbouring fibres and vi) assumption of perpendicular orientation of homogenous fibres in the filtration structure. Generally speaking, “classical theory” of filtration was used for characterization of the steady - state filtration process (filtration in a clean filter, at the beginning of the process) without deeper investigation of the influence of the nternal structure of the filter on its performance. The aim of this review is to outline and discuss the progress of deep-bed filtration modelling from the use of simple empirical correlations to advanced techniques of Computational Fluid Dynamics and Digital Fluid Dynamics.

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Modelling of deposition of flexible fractal-like aggregates on cylindrical fibre in continuum regime

Cited by 2 publications

References 22 publications

Chemical and Process Engineering

Chemical and Process Engineering

Estimation of Filtration Efficiency – from Simple Correlations to Digital Fluid Dynamics

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