ANALYSIS OF LOCAL THERMAL EQUILIBRIUM ASSUMPTION IN TRANSIENT FORCED CONVECTION IN A GRAPHITE FOAM CHANNEL

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dc.authoridGuruf, Gursah/0000-0003-3602-8710
dc.contributor.authorGuruf, Gursah
dc.contributor.authorSolmaz, Ismail
dc.contributor.authorBayer, Ozgur
dc.date.accessioned2024-09-29T16:12:17Z
dc.date.available2024-09-29T16:12:17Z
dc.date.issued2020
dc.departmentKarabük Üniversitesien_US
dc.description.abstractIn this study, the validity of Local Thermal Equilibrium (LTE) assumption in the transient forced convection of a rectangular channel filled with a block of graphite foam is examined numerically. The governing macroscopic energy conservation equations for solid and gas phases are derived by taking the average of the microscopic one over the averaging volume. Initially, LTE is in existence between the phases and then, the fluid temperature at the channel inlet is suddenly raised. Besides, an appropriate insulation is provided for the wall of the channel. Hence, a transient one-dimensional Local Thermal Non-Equilibrium (LTNE) model is considered in the numerical investigation. Thermo-physical properties of the solid and fluid phases are presumed to be constant. The graphite foam porosity is spatially uniform and constant. The impact of two dimensionless variables such as fluid to solid Nusselt number (Nu(fs)) and Reynolds number (Re) on the LTE assumption is extensively investigated. . It was found that the dimensionless time required to attain LTE between the phases (tau(LTE)) increases with the increasing value of Reynolds number. However, the real-time (sigma(LTE)) corresponding to tau(LTE) was found to be nearly 4 sec over the range of Re numbers studied. Additionally, an increase in the Nu(fs), resulted in a decrease in TLTE for a constant value of Re number and sigma(LTE) varied from 1.5 to 5 sec. As a result, the obtained findings showed that it is reasonable to assume the LTE between the phases under the investigated conditions.en_US
dc.description.sponsorshipScientific & Technological Research Council of Turkey (TUBITAK) [315M136]en_US
dc.description.sponsorshipThe authors would like to thank the Scientific & Technological Research Council of Turkey (TUBITAK) for financially supporting this research under Project No. 315M136.en_US
dc.identifier.endpage2067en_US
dc.identifier.issn1304-7205
dc.identifier.issn1304-7191
dc.identifier.issue4en_US
dc.identifier.startpage2057en_US
dc.identifier.urihttps://hdl.handle.net/20.500.14619/8661
dc.identifier.volume38en_US
dc.identifier.wosWOS:000603605300031en_US
dc.identifier.wosqualityN/Aen_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.language.isoenen_US
dc.publisherYildiz Technical Univen_US
dc.relation.ispartofSigma Journal of Engineering and Natural Sciences-Sigma Muhendislik Ve Fen Bilimleri Dergisien_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectFoamen_US
dc.subjectforced convectionen_US
dc.subjectgraphiteen_US
dc.subjectLTEen_US
dc.subjectLTNEen_US
dc.subjectporous mediaen_US
dc.subjecttransienten_US
dc.titleANALYSIS OF LOCAL THERMAL EQUILIBRIUM ASSUMPTION IN TRANSIENT FORCED CONVECTION IN A GRAPHITE FOAM CHANNELen_US
dc.typeArticleen_US

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