Investigation of Heat Transfer and Entropy Generation of Natural Convection in Gambrel Roof

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dc.contributor.authorOgwumike, T.E.
dc.contributor.authorOlakoyejo, O.T.
dc.contributor.authorMusah, A.A.
dc.contributor.authorOloruntoba, O.T.
dc.contributor.authorOyekeye, M.O.
dc.date.accessioned2022-09-07T07:51:37Z
dc.date.available2022-09-07T07:51:37Z
dc.date.issued2022
dc.descriptionScholarly articleen_US
dc.description.abstractA numerical study has been executed for a 2D laminar natural convection in Gambrel roof with boundary conditions that depict a hot weather climate in Nigeria. A commercial numerical code is used to model the design conditions. As a result of symmetry of the Gambrel roof geometry, half of the roof is used to carry out the study. The inclined roof and bottom roof surfaces are kept isothermally heated and cooled respectively, while the vertical surface at the symmetry line is kept adiabatic. Air is used as the coolant in this analysis. The effects of base ( ) and top ( ) pitch angles and Rayleigh number (Ra) on the heat transfer and entropy generation characteristics are investigated. The results are presented by Nusselt number (Nu), entropy generation, isotherms and streamlines. Isotherms are seen to be smooth and uniform at lower Ra, while they undergo distortion at higher Ra. When the pitch angles are fixed, the effect of Ra on the Nu is not significant until Ra 105 , after which the relationship between Ra and Nu is becomes clearly linear. At fixed Ra, reducing  causes an increase in total entropy generation and Nu while increasing the  causes a slight increase in the Nu. The physical implication of this is that at fixed Ra, the best convective heat transfer process is achieved by reducing  and increasing . This study would prove useful to designers in improving the thermal comfort of buildings with the Gambrel roof for a summer climate condition.en_US
dc.identifier.citationOgwumike, T.E., Olakoyejo, O.T., Musah, A.A., Oloruntoba, O.T. and Oyekeye, M.O. (2022). Investigation of Heat Transfer and Entropy Generation of Natural Convection in Gambrel Roof, Uniport Journal of Engineering and Scientific Research vol 6(2), 24-33en_US
dc.identifier.urihttps://ir.unilag.edu.ng/handle/123456789/11337
dc.language.isoenen_US
dc.publisherUJESRen_US
dc.subjectNatural convectionen_US
dc.subjectPitch angleen_US
dc.subjectNusselt numberen_US
dc.subjectEntropy generationen_US
dc.subjectResearch Subject Categories::TECHNOLOGY::Engineering mechanicsen_US
dc.titleInvestigation of Heat Transfer and Entropy Generation of Natural Convection in Gambrel Roofen_US
dc.typeArticleen_US
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