Simulation of impaction filtration of aerosol droplets in porous media

L. Ghazaryan, D.J. Lopez Penha, Bernardus J. Geurts, S. Stolz, Steffen Stolz, Christoph Winkelmann

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

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Abstract

We report on the development of a method to simulate from first principles the particle filtration efficiency of filters that are composed of structured porous media. We assume that the ratio of particle density to the fluid density is high. We concentrate on the motion of the particles in a laminar flow and quantify the role of inertial effects on the filtration of an ensemble of particles. We adopt the Euler-Lagrange approach, distinguishing a flow field in which the motion of a large number of discrete particles is simulated. We associate filtration with the deterministic collision of inertial particles with solid elements of the structured porous medium. To underpin the physical `consistency' of deterministic particle filtration, we investigate to what extent the particle tracking algorithm ensures that mass-less test-particles will not be captured by the structured porous filter at all. This element of the algorithm is essential in order to distinguish physical filtration by inertial effects from unwanted numerical filtration, due to the finite spatial resolution of the gas flow. We consider filtration of particles whose motion is governed by Stokes drag and determine the filtration efficiency in a range of Stokes relaxation times. An exponential decay of the number of particles with time is observed.
Original languageEnglish
Title of host publicationProceedings of the V European Conference on Computational Fluid Dynamics ECCOMAS CFD 2010
EditorsJ.C.F Pereira, A. Sequeira, J.M.C. Pereira
Place of PublicationLisbon, Portugal
PublisherTechnical University of Lisbon
Pages01197
Number of pages9
ISBN (Print)978-989-96778-1-4
Publication statusPublished - 2010
Event5th European Conference on Computational Fluid Dynamics, ECCOMAS ECFD 2010 - Lisbon, Portugal
Duration: 14 Jun 201017 Jun 2010
Conference number: 5

Conference

Conference5th European Conference on Computational Fluid Dynamics, ECCOMAS ECFD 2010
Abbreviated titleECCOMAS ECFD 2010
CountryPortugal
CityLisbon
Period14/06/1017/06/10

Fingerprint

aerosols
simulation
filters
particle motion
laminar flow
drag
gas flow
flow distribution
spatial resolution
relaxation time
collisions
fluids
decay

Keywords

  • Aeosol Filtration
  • Structured porous media
  • Immersed boundary method
  • Filtration efficiency
  • Particle tracking
  • Stokes Number

Cite this

Ghazaryan, L., Lopez Penha, D. J., Geurts, B. J., Stolz, S., Stolz, S., & Winkelmann, C. (2010). Simulation of impaction filtration of aerosol droplets in porous media. In J. C. F. Pereira, A. Sequeira, & J. M. C. Pereira (Eds.), Proceedings of the V European Conference on Computational Fluid Dynamics ECCOMAS CFD 2010 (pp. 01197). Lisbon, Portugal: Technical University of Lisbon.
Ghazaryan, L. ; Lopez Penha, D.J. ; Geurts, Bernardus J. ; Stolz, S. ; Stolz, Steffen ; Winkelmann, Christoph. / Simulation of impaction filtration of aerosol droplets in porous media. Proceedings of the V European Conference on Computational Fluid Dynamics ECCOMAS CFD 2010. editor / J.C.F Pereira ; A. Sequeira ; J.M.C. Pereira. Lisbon, Portugal : Technical University of Lisbon, 2010. pp. 01197
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abstract = "We report on the development of a method to simulate from first principles the particle filtration efficiency of filters that are composed of structured porous media. We assume that the ratio of particle density to the fluid density is high. We concentrate on the motion of the particles in a laminar flow and quantify the role of inertial effects on the filtration of an ensemble of particles. We adopt the Euler-Lagrange approach, distinguishing a flow field in which the motion of a large number of discrete particles is simulated. We associate filtration with the deterministic collision of inertial particles with solid elements of the structured porous medium. To underpin the physical `consistency' of deterministic particle filtration, we investigate to what extent the particle tracking algorithm ensures that mass-less test-particles will not be captured by the structured porous filter at all. This element of the algorithm is essential in order to distinguish physical filtration by inertial effects from unwanted numerical filtration, due to the finite spatial resolution of the gas flow. We consider filtration of particles whose motion is governed by Stokes drag and determine the filtration efficiency in a range of Stokes relaxation times. An exponential decay of the number of particles with time is observed.",
keywords = "Aeosol Filtration, Structured porous media, Immersed boundary method, Filtration efficiency, Particle tracking, Stokes Number",
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Ghazaryan, L, Lopez Penha, DJ, Geurts, BJ, Stolz, S, Stolz, S & Winkelmann, C 2010, Simulation of impaction filtration of aerosol droplets in porous media. in JCF Pereira, A Sequeira & JMC Pereira (eds), Proceedings of the V European Conference on Computational Fluid Dynamics ECCOMAS CFD 2010. Technical University of Lisbon, Lisbon, Portugal, pp. 01197, 5th European Conference on Computational Fluid Dynamics, ECCOMAS ECFD 2010, Lisbon, Portugal, 14/06/10.

Simulation of impaction filtration of aerosol droplets in porous media. / Ghazaryan, L.; Lopez Penha, D.J.; Geurts, Bernardus J.; Stolz, S.; Stolz, Steffen; Winkelmann, Christoph.

Proceedings of the V European Conference on Computational Fluid Dynamics ECCOMAS CFD 2010. ed. / J.C.F Pereira; A. Sequeira; J.M.C. Pereira. Lisbon, Portugal : Technical University of Lisbon, 2010. p. 01197.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

TY - GEN

T1 - Simulation of impaction filtration of aerosol droplets in porous media

AU - Ghazaryan, L.

AU - Lopez Penha, D.J.

AU - Geurts, Bernardus J.

AU - Stolz, S.

AU - Stolz, Steffen

AU - Winkelmann, Christoph

PY - 2010

Y1 - 2010

N2 - We report on the development of a method to simulate from first principles the particle filtration efficiency of filters that are composed of structured porous media. We assume that the ratio of particle density to the fluid density is high. We concentrate on the motion of the particles in a laminar flow and quantify the role of inertial effects on the filtration of an ensemble of particles. We adopt the Euler-Lagrange approach, distinguishing a flow field in which the motion of a large number of discrete particles is simulated. We associate filtration with the deterministic collision of inertial particles with solid elements of the structured porous medium. To underpin the physical `consistency' of deterministic particle filtration, we investigate to what extent the particle tracking algorithm ensures that mass-less test-particles will not be captured by the structured porous filter at all. This element of the algorithm is essential in order to distinguish physical filtration by inertial effects from unwanted numerical filtration, due to the finite spatial resolution of the gas flow. We consider filtration of particles whose motion is governed by Stokes drag and determine the filtration efficiency in a range of Stokes relaxation times. An exponential decay of the number of particles with time is observed.

AB - We report on the development of a method to simulate from first principles the particle filtration efficiency of filters that are composed of structured porous media. We assume that the ratio of particle density to the fluid density is high. We concentrate on the motion of the particles in a laminar flow and quantify the role of inertial effects on the filtration of an ensemble of particles. We adopt the Euler-Lagrange approach, distinguishing a flow field in which the motion of a large number of discrete particles is simulated. We associate filtration with the deterministic collision of inertial particles with solid elements of the structured porous medium. To underpin the physical `consistency' of deterministic particle filtration, we investigate to what extent the particle tracking algorithm ensures that mass-less test-particles will not be captured by the structured porous filter at all. This element of the algorithm is essential in order to distinguish physical filtration by inertial effects from unwanted numerical filtration, due to the finite spatial resolution of the gas flow. We consider filtration of particles whose motion is governed by Stokes drag and determine the filtration efficiency in a range of Stokes relaxation times. An exponential decay of the number of particles with time is observed.

KW - Aeosol Filtration

KW - Structured porous media

KW - Immersed boundary method

KW - Filtration efficiency

KW - Particle tracking

KW - Stokes Number

M3 - Conference contribution

SN - 978-989-96778-1-4

SP - 01197

BT - Proceedings of the V European Conference on Computational Fluid Dynamics ECCOMAS CFD 2010

A2 - Pereira, J.C.F

A2 - Sequeira, A.

A2 - Pereira, J.M.C.

PB - Technical University of Lisbon

CY - Lisbon, Portugal

ER -

Ghazaryan L, Lopez Penha DJ, Geurts BJ, Stolz S, Stolz S, Winkelmann C. Simulation of impaction filtration of aerosol droplets in porous media. In Pereira JCF, Sequeira A, Pereira JMC, editors, Proceedings of the V European Conference on Computational Fluid Dynamics ECCOMAS CFD 2010. Lisbon, Portugal: Technical University of Lisbon. 2010. p. 01197