Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/2427
Title: Effects of wall-located heat barrier on conjugate conduction/natural- convection heat transfer and fluid flow in enclosures
Authors: Hakyemez, Erinç
Mobedi, Moghtada
Öztop, Hakan Fehmi
Keywords: Walls (structural partitions)
Thermoanalysis
Bioconversion
Enclosures
Heating equipment
Issue Date: Jan-2008
Publisher: Taylor and Francis Ltd.
Source: Hakyemez, E., Mobedi, M., and Öztop, H. F. (2008). Effects of wall-located heat barrier on conjugate conduction/natural- convection heat transfer and fluid flow in enclosures. Numerical Heat Transfer; Part A: Applications, 54(2), 197-220. doi:10.1080/10407780802084447
Abstract: The effects of a heat barrier, located in the ceiling wall of an enclosure, on conjugate conduction/natural convection are investigated numerically. The vertical walls of the enclosure are differentially heated and the horizontal walls are adiabatic. Heatline technique is used to visualize heat transport. The variations of average Nusselt number, dimensionless heat transfer rate through the ceiling wall, and dimensionless overall heat transfer rate are studied. Calculations are performed for different Rayleigh numbers (10 3≤ Ra ≤ 10 6), thermal conductivity ratios (1 ≤ K ≤ 100), dimensionless locations of the heat barrier (0 < X h < 1),and two dimensionless ceiling wall thicknesses (D = 0.05 and D = 0.20). For high thermal conductivity ratio (K = 100), the heat barrier considerably reduces the dimensionless overall heat transfer rate. The effect of the heat barrier on dimensionless heat transfer rate through the enclosure increases as the Rayleigh number decreases. For low Rayleigh number (i.e., Ra = 10 3), a location exists in the ceiling wall for which the dimensionless overall heat transfer rate is minimum.
URI: http://doi.org/10.1080/10407780802084447
http://hdl.handle.net/11147/2427
ISSN: 1040-7782
1040-7782
1521-0634
Appears in Collections:Mechanical Engineering / Makina Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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