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首页> 外文期刊>International Journal of Heat and Mass Transfer >A novel correlation for azimuthal and longitudinal distributions of heat transfer coefficients in developing horizontal pipe flow under transitional mixed convection
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A novel correlation for azimuthal and longitudinal distributions of heat transfer coefficients in developing horizontal pipe flow under transitional mixed convection

机译：过渡混合对流中水平管流发展过程中传热系数的方位角和纵向分布的新型相关性

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摘要

Developing flow of FC-72 in a uniformly heated horizontal cylindrical pipe was studied in the regime of transitional mixed convection. Heat transfer coefficients were measured at six cross sections along the heated length, with 60 azimuthal positions being monitored at each section. Tests were conducted at six different flow rates and three imposed heat fluxes. A significantly different thermo-fluid-dynamic behaviour was observed between top and bottom of the pipe. A single Nusselt number correlation was proposed for the entire heat transfer surface, best fitting the 5760 experimental points with only seven parameters. The conceptual evolution to the final expression of the correlation is shown. The average deviation from the measurements is 3%, with a maximum deviation of 17.5%. The consistency shown by the proposed correlation suggests it can be used to increase the design accuracy of heat exchangers and heat sinks that work in the explored range of dimensionless parameters.
机译：以过渡混合对流的方式研究了FC-72在均匀加热的水平圆柱管中的发展流动。在沿加热长度的六个横截面处测量传热系数，并在每个区域监视60个方位角位置。在六种不同的流量和三种施加的热通量下进行了测试。在管道的顶部和底部之间观察到显着不同的热流体动力学行为。提出了整个传热表面的单个Nusselt数相关性，仅用7个参数最适合5760实验点。显示了相关性最终表达的概念演变。与测量值的平均偏差为3％，最大偏差为17.5％。所提出的相关性显示出的一致性表明，它可用于提高在无量纲参数探索范围内工作的热交换器和散热器的设计精度。

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