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Heat transfer of a U-bend in a cross flow of air at different angles of incidence

机译:U形弯头在不同入射角的空气横流中的热传递

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摘要

An experimental investigation into the incidence angle dependence on mean external heat transfer coefficient for a circular U-bend (l80) in a cross flow of air was performed. All tests were performed on a U-bend with a curvature ratio (δ) of 0.296 covering a Reynolds number range of l.2 x l0~4 to 2.7 x l0~4, while imposing a uniform wall temperature boundary condition. It was found that the U-bend had maximum external heat transfer rate when the external air flow velocity vector was nearly parallel to the bend plane (angle-of-incidence equals 0). As the angle-of incidence increased, the external heat transfer coefficient for the U-bend decreased. As the angle-of-incidence approached 90, the external heat transfer coefficient for the U-bend asymtoped to the value for corresponding flow over a circular cylinder of the same outer diameter.
机译:进行了一个实验研究,研究了在空气横流中圆形U形弯曲(180)的入射角对平均外部传热系数的依赖性。所有测试都是在U形弯曲上进行的,曲率比(δ)为0.296,覆盖的雷诺数范围为1.2 x 10-4至2.7 x 10-4,同时施加了均匀的壁温边界条件。发现当外部空气流速矢量几乎平行于弯曲平面(入射角等于0)时,U形弯曲具有最大的外部传热速率。随着入射角的增加,U型弯管的外部传热系数降低。当入射角接近90时,U形弯头的外部传热系数渐渐减小到相同外径的圆柱体上相应流动的值。

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