Effect of heaters' clearance on mixed convection cooling performance in a dicretely heated horizontal duct
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Tarih
2021
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier France-Editions Scientifiques Medicales Elsevier
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In this paper, effect of the heaters' clearance on mixed convective cooling performance in a discretely heated horizontal duct is examined. Tests are carried out for a constant value of the modified Grashof number (Gr*(Dh) = 1.15 x 10(7)), and for Reynolds numbers (Re-Dh) between 792 and 3,962. In the analysis, surface to surface radiation and wall conduction are coupled with convective heat transfer. Experiments involve measurements of surface temperatures and air velocity while ANSYS Fluent is used to conduct numerical simulations. Variations of the local surface temperatures, hot spot temperature, global conductance (C) and effective Nusselt number (Nu(eff)) with Reynolds number (Re-Dh) are presented. Finally, it is disclosed that up to 10.77% reduction in the hot spot temperature and an improvement of up to 20.84% in the system's global conductance can be achieved with an increase in the clearance.
Açıklama
Anahtar Kelimeler
Mixed convection, Horizontal duct, Clearance, Global conductance, Effective Nusselt number
Kaynak
International Journal of Thermal Sciences
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
163
