Three-Dimensional Study of Combined Conduction, Radiation, and Natural Convection From Discrete Heat Sources in a Horizontal Narrow-Aspect-Ratio Enclosure
Three-Dimensional Study of Combined Conduction, Radiation, and Natural Convection From Discrete Heat Sources in a Horizontal Narrow-Aspect-Ratio Enclosure
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水平窄纵横比外壳中离散热源的组合传导、辐射和自然对流的三维研究
DOI：
10.1115/1.2826091
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发表时间：
1999
影响因子：
--
通讯作者：
D. Blackburn
中科院分区：
文献类型：
--
作者：
V. Adams;Y. Joshi;D. Blackburn
在长、宽、高比为6:6:1的充气矩形窄长宽比封闭室内，对水平基板上3 × 3离散凸出热源阵列的三维自然对流流动和传热进行了数值研究。采用有限体积法求解了空气自然对流、耦合传导和辐射的控制方程。该研究考察了热源、基材和外壳壁之间复杂的热相互作用，这些相互作用受墙壁和基材的导热性的影响，目的是确定哪些物理效应和细节水平对于准确预测离散加热外壳的热行为是必要的。特别注意辐射对整体传热的影响。问题的三维性在整体流动特性和热源表面的对流换热边缘效应中表现得很明显。在9.7 × 10 5 ~ 1.6 × 10 7范围内，对热源和基材的温度预测与实验测量结果非常吻合
Three-dimensional natural convection flow and heat transfer were numerically studied for a three-by-three array of discrete protruding heat sources on a horizontal substrate in an air-filled, rectangular, narrow-aspect-ratio enclosure with length, width, and height ratio of 6:6:1. The governing equations for natural convection in air, coupled with conjugate conduction and radiation within the enclosure were solved using a finite volume method. The study examines the complex thermal interactions between the heat sources, substrate, and enclosure walls as affected by the thermal conductance of the walls and substrate with the intent of determining which physical effects and level of detail are necessary to accurately predict thermal behavior of discretely heated enclosures. The influence of radiation on the overall heat transfer is given particular attention. The three-dimensionality of the problem was evident in the overall flow characteristics and in the convective heat transfer edge effects on the heat source surfaces. Excellent agreement between temperature predictions on the heat sources and substrate and experimental measurements was obtained for modified Rayleigh numbers in the range of 9.7 × 10 5 to 1.6 × 10 7