Euzenat, Florian; Hammouti, Abdelkader; Climent, Eric; Fede, Pascal et Wachs, Anthony (2021). Effect of spatial filter features on local heat transfer coefficients obtained from particle-resolved simulations of a flow through a fixed random array of rigid spherical particles. International Journal of Heat and Fluid Flow , vol. 92 . p. 108873. DOI: 10.1016/j.ijheatfluidflow.2021.108873.
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We use Particle-Resolved (Direct Numerical) Simulation (PR-DNS or PRS) to investigate momentum and heat transfer in the incompressible flow of a Newtonian fluid through a fixed bed of mono-disperse spheres. We perform a set of simulations with various porosities ranging from 0.5 to 0.9, Reynolds numbers ranging from 18 to 72 and Prandtl numbers ranging from 1 to 5 and analyze computed results. All cases are hence in the moderately convection dominated thermal regimes, i.e., Peclet numbers from 18 to 360. We locally average fluid flow data around particles using different filters centered at each particle mass center and we study the effect of the mathematical form of the filter as well as of the filter support size on the particle Nusselt number distribution. While both mathematical form and support size have a limited effect on the average particle Nusselt number, the width of the distribution, i.e., the standard deviation, is strongly influenced by the filter support size. This observation has important consequences for the derivation of new transfer coefficient models that incorporate information about the actual particle microstructure and attempt to estimate the transfer coefficient fluctuations for a given average local porosity.
| Type de document: | Article |
|---|---|
| Mots-clés libres: | fixed bed; heat transfer; particle-laden flow; parallel computing; PRS |
| Centre: | Centre Eau Terre Environnement |
| Date de dépôt: | 23 juin 2022 14:24 |
| Dernière modification: | 23 juin 2022 14:24 |
| URI: | https://espace.inrs.ca/id/eprint/12704 |
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