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单面加热方管混合对流换热特性实验研究

Journal of Engineering Thermophysics(2012)

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Abstract
本文对单壁面加热水平方管通道内混合对流换热进行了实验研究,其中加热面分别为底面、侧面、顶面,Re=1514~3028,Gr~*=2.06×10~6~8.22×10~6;通过对加热面温度进行曲线拟合减小壁面温度测量误差,得到考虑轴向导热的局部Nusselt数的变化规律。实验结果表明侧面加热和底面加热时,局部Nusselt数要明显高于顶面加热的情况;局部Nusselt数在管道前段受Re的影响较大,在后段受Gr~*的影响较大。
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Key words
Horizontal square duct,Mixed convection,Nusselt number
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