Natural convection subject to sinusoidal thermal forcing on inclined walls and heat source located on bottom wall of an attic-shaped space

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• 作者：Atta Sojoudi^a ; ^{meoiotu@yahoo.com" class="auth_mail" title="E-mail the corresponding author} ; Suvash C. Saha^b ; Ali M. Sefidan^c ; Y.T. Gu^b
• 关键词：Free convection ; Sinusoidal thermal boundary condition ; Triangular enclosure
• 刊名：Energy & Buildings
• 出版年：2016
• 出版时间：15 September 2016
• 年：2016
• 卷：128
• 期：Complete
• 页码：845-866
• 全文大小：6151 K

文摘

Natural convection within an attic space under diurnal temperature condition on the sloping wall and a heat source located on the insulated bottom wall have been studied to show the basic flow features in the attic space over diurnal cycles. The finite volume numerical method has been employed to solve the governing equations. Effect of Rayleigh number (Ra), attic aspect ratio, heater location and its size are discussed on the transient flow pattern and heat transfer phenomenon after grid independency and time interval selection tests with a fixed prandtl number of 0.72 (air). Results are presented as a form of isotherms and streamlines. Also, heat transfer is presented as a form of Nusselt number. The numerical experiments show that, the flow in the attic space is stratified during the daytime heating stage; whereas the flow becomes unstable at the night-time cooling stage.