Articles producció científica> Enginyeria Mecànica

Transport and wall surface deposition of airborne particles in enclosed, buoyancy-driven turbulent flows using fully-resolved numerical simulations

  • Dades identificatives

    Identificador: imarina:9262234
    Autors:
    Fabregat APallarès J
    Resum:
    Airborne particle transport and deposition on solid surfaces play a key role in aerosol deposition, infectious diseases transmission and surface soiling. Moving fluids disperse particles by the action of several forces including drag, lift, thermophoresis, buoyancy and Brownian effects. The relative importance of each contribution depends on the phases density ratio and the particle size. These two parameters, along with the characteristics of the boundary layers, control the local wall deposition rate. Experiments and analytical solutions have provided partial information on deposition velocity for several particle sizes and turbulent intensities in air filled cavities. While experimental data is restricted to few selected wall locations, boundary layer models results only provide wall-average values. Using Direct Numerical Simulations to solve the flow hydrodynamics and Exponential-Lagrangian Tracking Schemes for the disperse phase, deposition rates on each surface of a cubical cavity with oppositely heated walls have been determined. Numerical results at Ra = 5.4 × 108 are in very good agreement with experiments for 0.1 and 0.5 μm particle diameters. Deposition rate on adiabatic walls is found to be spatially inhomogeneous with particles accumulating near the corners where hot and cold walls meet. These preferential spots are explained by intensified wall-normal turbulent transport in these particular regions.
  • Altres:

    Autor segons l'article: Fabregat A; Pallarès J
    Departament: Enginyeria Mecànica
    Autor/s de la URV: Fabregat Tomàs, Alexandre / Pallarés Curto, Jorge María
    Paraules clau: Wall particle deposition Turbulent transport Thermophoresis Natural convection Large-eddy simulation Direct numerical simulation Brownian motion wall particle deposition turbulent transport thermophoresis rectangular enclosures natural-convection laden flow direct numerical simulation cavities brownian motion
    Resum: Airborne particle transport and deposition on solid surfaces play a key role in aerosol deposition, infectious diseases transmission and surface soiling. Moving fluids disperse particles by the action of several forces including drag, lift, thermophoresis, buoyancy and Brownian effects. The relative importance of each contribution depends on the phases density ratio and the particle size. These two parameters, along with the characteristics of the boundary layers, control the local wall deposition rate. Experiments and analytical solutions have provided partial information on deposition velocity for several particle sizes and turbulent intensities in air filled cavities. While experimental data is restricted to few selected wall locations, boundary layer models results only provide wall-average values. Using Direct Numerical Simulations to solve the flow hydrodynamics and Exponential-Lagrangian Tracking Schemes for the disperse phase, deposition rates on each surface of a cubical cavity with oppositely heated walls have been determined. Numerical results at Ra = 5.4 × 108 are in very good agreement with experiments for 0.1 and 0.5 μm particle diameters. Deposition rate on adiabatic walls is found to be spatially inhomogeneous with particles accumulating near the corners where hot and cold walls meet. These preferential spots are explained by intensified wall-normal turbulent transport in these particular regions.
    Àrees temàtiques: Thermodynamics Química Mechanics Interdisciplinar General chemical engineering Engenharias iv Engenharias iii Engenharias ii Condensed matter physics Ciências biológicas i Chemical engineering (miscellaneous) Chemical engineering (all) Biotecnología Atomic and molecular physics, and optics Astronomia / física
    Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/
    Adreça de correu electrònic de l'autor: alexandre.fabregat@urv.cat jordi.pallares@urv.cat
    Identificador de l'autor: 0000-0002-6032-2605 0000-0003-0305-2714
    Data d'alta del registre: 2024-09-07
    Versió de l'article dipositat: info:eu-repo/semantics/publishedVersion
    Enllaç font original: https://www.sciencedirect.com/science/article/pii/S0735193322001701?via%3Dihub
    URL Document de llicència: https://repositori.urv.cat/ca/proteccio-de-dades/
    Referència a l'article segons font original: International Communications In Heat And Mass Transfer. 134
    Referència de l'ítem segons les normes APA: Fabregat A; Pallarès J (2022). Transport and wall surface deposition of airborne particles in enclosed, buoyancy-driven turbulent flows using fully-resolved numerical simulations. International Communications In Heat And Mass Transfer, 134(), -. DOI: 10.1016/j.icheatmasstransfer.2022.106048
    DOI de l'article: 10.1016/j.icheatmasstransfer.2022.106048
    Entitat: Universitat Rovira i Virgili
    Any de publicació de la revista: 2022
    Tipus de publicació: Journal Publications
  • Paraules clau:

    Atomic and Molecular Physics, and Optics,Chemical Engineering (Miscellaneous),Condensed Matter Physics,Mechanics,Thermodynamics
    Wall particle deposition
    Turbulent transport
    Thermophoresis
    Natural convection
    Large-eddy simulation
    Direct numerical simulation
    Brownian motion
    wall particle deposition
    turbulent transport
    thermophoresis
    rectangular enclosures
    natural-convection
    laden flow
    direct numerical simulation
    cavities
    brownian motion
    Thermodynamics
    Química
    Mechanics
    Interdisciplinar
    General chemical engineering
    Engenharias iv
    Engenharias iii
    Engenharias ii
    Condensed matter physics
    Ciências biológicas i
    Chemical engineering (miscellaneous)
    Chemical engineering (all)
    Biotecnología
    Atomic and molecular physics, and optics
    Astronomia / física
  • Documents:

  • Cerca a google

    Search to google scholar