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首页> 外文会议>International heat transfer conference;IHTC1998 >Total exchange areas for rectangular enclosures with reflecting walls by the direct dicrete-ordinates method
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Total exchange areas for rectangular enclosures with reflecting walls by the direct dicrete-ordinates method

机译：通过直接离散坐标法对具有反射壁的矩形外壳的总交换面积

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The purposeof this study is to show that total exchange areas (TEA) for a rectangular box type enclosure can be computed accurately by using the direct discrete-ordinates method (DS_N). The medium is either transparent or gray absorbing and emitting. The walls emit diffusely but reflect diffusely or specularly. Symmetric or unsymmetric ordinates sets are used for the results. For both cases, the DS_N weights are set equal to the solid angles of the meshes. The effects of optical thickness, wall emittance,a nd diffuse or specular reflectance as well as the numbers of spatial and angular divisions on the accuracy of TEA results are studied. The results are insensitive to the choice of the symmetric or unsymmetric ordinates sets. The results agree well with the predictions by the matrix approach. The results by the DS_N method converge to the exact values as the number of spatial and angular division increase.
机译：这项研究的目的是表明，使用直接离散坐标法（DS_N）可以精确地计算出矩形箱型外壳的总交换面积（TEA）。介质是透明的或灰色的吸收和发射。墙壁漫反射，但漫反射或镜面反射。结果使用对称或不对称的坐标集。对于这两种情况，将DS_N权重设置为等于网格的立体角。研究了光学厚度，壁发射率，漫反射或镜面反射率以及空间和角度划分数对TEA结果准确性的影响。结果对对称或不对称坐标集的选择不敏感。结果与矩阵法的预测非常吻合。 DS_N方法的结果随着空间和角度划分数量的增加而收敛到精确值。

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