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

机译:自然对流在阁楼形空间的斜壁上受到正弦热强迫,而热源位于阁楼形空间的底壁上

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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. (C) 2016 Elsevier B.V. All rights reserved.
机译:研究了倾斜温度下日间温度在阁楼空间内的自然对流以及位于隔热底壁上的热源,以显示日间周期内阁楼空间内的基本流动特征。有限体积数值方法已被用来求解控制方程。讨论了瑞雷数(Ra),阁楼长宽比,加热器位置及其尺寸对电网独立性和固定间隔数为0.72(空气)的时间间隔选择测试后的瞬态流型和传热现象的影响。结果以等温线和流线形式表示。同样,传热以努塞尔数形式表示。数值实验表明,白天采暖阶段,阁楼空间的流动是分层的。而在夜间冷却阶段,气流变得不稳定。 (C)2016 Elsevier B.V.保留所有权利。

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