Articles producció científica> Enginyeria Mecànica

Fully-resolved numerical simulations of the turbulent flow and particle deposition in a cubical cavity with two pairs of differentially heated opposed walls at Rayleigh number 3.6 × 109

  • Dades identificatives

    Identificador: imarina:9287664
    Autors:
    Lavrinenko AGisbert FPallares JFabregat A
    Resum:
    The turbulent dispersion and deposition of airborne solid particles is studied by means of fully-resolved numerical simulations. The computational domain, consisting in a cubical cavity with differentially heated opposed walls filled with air, reproduces the experimental conditions of measurements previously reported in the literature. The computational model assumes that each solid spherical particle trajectory is governed by the balance between hydrodynamic drag, buoyancy, lift, thermophoresis and Brownian forces. The dominant terms responsible for particle deposition mostly depend on the particle size, the solid–gas density ratio and the hydrodynamics within the thermal and momentum boundary layers near the solid surfaces. The present results suggest that previous correlations for the wall-averaged Nusselt number as a function of Rayleigh number over the range between 107 and 5.4×108 can be extended up to Rayleigh number 3.6×109. Also, numerical predictions of the particle deposition rates on thermally active surfaces are in good agreement with both experimental data and analytical boundary layer solutions for particle sizes ranging between 0.1 μm and 2.5 μm in diameter. These particle sizes allows to study different particle deposition regimes varying from that controlled by thermophoresis (0.1 μm) to that dominated by gravitational forces (2.5 μm).
  • Altres:

    Autor segons l'article: Lavrinenko A; Gisbert F; Pallares J; Fabregat A
    Departament: Enginyeria Mecànica
    Autor/s de la URV: Fabregat Tomàs, Alexandre
    Paraules clau: Turbulent mixing Particle wall deposition Natural convection Dispersed multiphase flows Direct numerical simulation Cubical cavity
    Resum: The turbulent dispersion and deposition of airborne solid particles is studied by means of fully-resolved numerical simulations. The computational domain, consisting in a cubical cavity with differentially heated opposed walls filled with air, reproduces the experimental conditions of measurements previously reported in the literature. The computational model assumes that each solid spherical particle trajectory is governed by the balance between hydrodynamic drag, buoyancy, lift, thermophoresis and Brownian forces. The dominant terms responsible for particle deposition mostly depend on the particle size, the solid–gas density ratio and the hydrodynamics within the thermal and momentum boundary layers near the solid surfaces. The present results suggest that previous correlations for the wall-averaged Nusselt number as a function of Rayleigh number over the range between 107 and 5.4×108 can be extended up to Rayleigh number 3.6×109. Also, numerical predictions of the particle deposition rates on thermally active surfaces are in good agreement with both experimental data and analytical boundary layer solutions for particle sizes ranging between 0.1 μm and 2.5 μm in diameter. These particle sizes allows to study different particle deposition regimes varying from that controlled by thermophoresis (0.1 μm) to that dominated by gravitational forces (2.5 μm).
    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
    Identificador de l'autor: 0000-0002-6032-2605
    Data d'alta del registre: 2024-08-03
    Versió de l'article dipositat: info:eu-repo/semantics/publishedVersion
    Enllaç font original: https://www.sciencedirect.com/science/article/pii/S0735193322006868
    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. 141
    Referència de l'ítem segons les normes APA: Lavrinenko A; Gisbert F; Pallares J; Fabregat A (2023). Fully-resolved numerical simulations of the turbulent flow and particle deposition in a cubical cavity with two pairs of differentially heated opposed walls at Rayleigh number 3.6 × 109. International Communications In Heat And Mass Transfer, 141(), -. DOI: 10.1016/j.icheatmasstransfer.2022.106564
    DOI de l'article: 10.1016/j.icheatmasstransfer.2022.106564
    Entitat: Universitat Rovira i Virgili
    Any de publicació de la revista: 2023
    Tipus de publicació: Journal Publications
  • Paraules clau:

    Atomic and Molecular Physics, and Optics,Chemical Engineering (Miscellaneous),Condensed Matter Physics,Mechanics,Thermodynamics
    Turbulent mixing
    Particle wall deposition
    Natural convection
    Dispersed multiphase flows
    Direct numerical simulation
    Cubical cavity
    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
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