20.500.12556/DKUM-91518 Computational modeling of natural convection in nanofluid-saturated porous media: an investigation into heat transfer phenomena Janja Kramer Stajnko ... [et al.] A numerical study was carried out to analyze the phenomenon of natural convection in a porous medium saturated with nanofluid. In the study, the boundary element method was used for computational modeling. The fluid flow through a porous matrix is described using the Darcy– Brinkman–Forchheimer momentum equation. In addition, a mathematical model for nanofluids was used, which follows a single-phase approach and assumes that the nanoparticles within a fluid can be treated as an independent fluid with effective properties. A combination of single- and sub-domain boundary element methods was used to solve the relevant set of partial differential equations. The method was originally developed for pure flow scenarios, but also proves to be effective in the context of fluid flow through porous media. The results are calculated for the case of two- and three-dimensional square cavities. In addition to various values of dimensionless control parameters, including the porous Rayleigh number (Rap), Darcy number (Da), porosity (ϕ) and nanoparticle volume fractions (φ), the effects of the inclination angle of the cavity on the overall heat transfer (expressed by the Nusselt number (Nu)) and fluid flow characteristics were investigated. The results indicate a pronounced dependence of the overall heat transfer on the introduction of nanoparticles and inclination angle. The heat transfer in a two-dimensional cavity is increased for higher values of Darcy number in the conduction flow regime, while it is suppressed for lower values of Darcy number in the Darcy flow regime. In the case of a three-dimensional cavity, increasing the volume fraction of nanoparticles leads to a decrease in heat transfer, and furthermore, increasing the inclination angle of the cavity considerably weakens the buoyancy flow porous media nanofluids natural convection boundary element method porozni mediji nanotekočine naravna konvekcija metoda mejnih elementov true false true MDPI Angleški jezik Slovenski jezik https://www.mdpi.com/2227-7390/12/23/3653 Članek v reviji 2025-01-10 14:40:07 2025-01-10 14:40:07 2025-01-11 03:10:38 0000-00-00 00:00:00 2024 0 0 22 str. iss. 23, [article no.] 3653 Vol. 12 Nov. 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2024-11-11 2024-11-19 2024-11-21 532.546:519.61/.64 219313923 10.3390/math12233653 2227-7390 mathematics-12-03653-v2.pdf mathematics-12-03653-v2.pdf 1 9C301BA59A68BA6C1228656DF0E4B0C0 37bfed7025f5f07c250df54e6a6b36fe1ad46a37e694c2999a51c37462b242c0 b9d01721-cf58-11ef-8532-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=187736 https://www.mdpi.com/2227-7390/12/23/3653 0 bf4a110e-cf58-11ef-8532-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=187737 Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo 0 0 0