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Sökning: WFRF:(Frishfelds Vilnis) > (2015-2018)

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1.
  • Burström, Per, et al. (författare)
  • Discrete and continuous modelling of convective heat transport in a thin porous layer of mono sized spheres
  • 2017
  • Ingår i: Heat and Mass Transfer. - : Springer. - 0947-7411 .- 1432-1181. ; 53:1, s. 151-160
  • Tidskriftsartikel (refereegranskat)abstract
    • Convective heat transport in a relatively thin porous layer of monosized particles is here modeled. The size of the particles is only one order of magnitude smaller than the thickness of the layer. Both a discrete three-dimensional system of particles and a continuous one-dimensional model are considered. The methodology applied for the discrete system is Voronoi discretization with minimization of dissipation rate of energy. The discrete and continuous model compares well for low velocities for the studied uniform inlet boundary conditions. When increasing the speed or for a thin porous layer however, the continuous model diverge from the discrete approach if a constant dispersion is used in the continuous approach. The new result is thus that a special correlation must be used when using a continuous model for flow perpendicular to a thin porous media in order to predict the dispersion in proper manner, especially in combination with higher velocities.
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2.
  • Burström, Per, et al. (författare)
  • Modelling heat transfer during flow through a random packed bed of spheres
  • 2018
  • Ingår i: Heat and Mass Transfer. - : Springer. - 0947-7411 .- 1432-1181. ; 54:4, s. 1225-1245
  • Tidskriftsartikel (refereegranskat)abstract
    • Heat transfer in a random packed bed of monosized iron ore pellets is modelled with both a discrete three-dimensional system of spheres and a continuous Computational Fluid Dynamics (CFD) model. Results show a good agreement between the two models for average values over a cross section of the bed for an even temperature profiles at the inlet. The advantage with the discrete model is that it captures local effects such as decreased heat transfer in sections with low speed. The disadvantage is that it is computationally heavy for larger systems of pellets. If averaged values are sufficient, the CFD model is an attractive alternative that is easy to couple to the physics up- and downstream the packed bed. The good agreement between the discrete and continuous model furthermore indicates that the discrete model may be used also on non-Stokian flow in the transitional region between laminar and turbulent flow, as turbulent effects show little influence of the overall heat transfer rates in the continuous model.
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