Please use this identifier to cite or link to this item: https://scholarhub.balamand.edu.lb/handle/uob/2317
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dc.contributor.authorIssa, Johnnyen_US
dc.contributor.authorSaliba, Najib G.en_US
dc.contributor.authorSidnawi, Bcharaen_US
dc.date.accessioned2020-12-23T09:10:50Z-
dc.date.available2020-12-23T09:10:50Z-
dc.date.issued2016-
dc.identifier.urihttps://scholarhub.balamand.edu.lb/handle/uob/2317-
dc.descriptionThis paper was presented in "Proceedings of the ASME 2016 International Mechanical Engineering Congress and Exposition. Phoenix, Arizona, USA. November 11-17, 2016.".en_US
dc.description.abstractHeat transfer in a laminar confined oscillating slot jet impinging on an isothermal surface is numerically investigated. A uniform inlet velocity profile, oscillating with an angle φ, is used at the jet exit. The angle φ changes in a sinusoidal form. The height-to-jet width ratio is fixed at 5. The working fluid is air with constant physical properties corresponding to Prandtl number, Pr, equal to 0.74 at ambient conditions. Reynolds number, Re, is defined based on the jet hydraulic diameter and is varied in the self-stable range between 100 and 400. Strouhal number, St, is also varied between 0.05 and 0.75. Oscillating the jet at Reynolds number equal to 100 showed no heat transfer improvement over the steady state case, regardless of the used Strouhal number values. The vortices generated by the oscillation were too weak and could barely reach the wall. The flow showed a high vulnerability to severe oscillations which drastically reduced the jet heat removal ability. The vorticity contours showed a perfect symmetry which resulted in instantaneous and average Nusselt number distributions that are symmetric about the center of the isothermal surface at x = 0. The average stagnation Nusselt number, Nu0, decreased by about 1.25% as Strouhal number is increased from 0.4 to 0.625 then dipped by 44.1% as St is further increased to 0.75, a fact that was attributed to reduction in the bulk momentum by the relatively high frequency. With Reynolds number at 250, the lowest two frequencies corresponding to St of 0.05 and 0.1, resulted in a flow field that is more developed to the right side of the channel, a phenomenon that was linked to the direction of the first jet swing. The corresponding average Nusselt number distributions were consequently asymmetric, with a significant shift to the right. This asymmetric behavior gradually disappeared as the frequency is increased. At St of 0.4 and 0.5, the average stagnation Nusselt number Nu0, showed a 2.2% increase over the steady .en_US
dc.format.extent10 p.en_US
dc.language.isoengen_US
dc.titleA numerical investigation of the effect of inlet velocity oscillation on heat transfer in a two-dimensional laminar jet impinging on an isothermal surfaceen_US
dc.typeJournal Articleen_US
dc.contributor.affiliationDepartment of Mechanical Engineeringen_US
dc.contributor.affiliationDepartment of Civil and Environmental Engineeringen_US
dc.description.volume8en_US
dc.date.catalogued2017-12-13-
dc.description.statusPublisheden_US
dc.identifier.OlibID175578-
dc.relation.ispartoftextJournal of american society of of mechanical enginneringen_US
dc.provenance.recordsourceOliben_US
crisitem.author.parentorgFaculty of Engineering-
Appears in Collections:Department of Mechanical Engineering
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