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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Heat transfer and crisis in swirl flow boiling
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Heat transfer and crisis in swirl flow boiling

机译：传热与旋流沸腾危机

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摘要

The lecture considers general features of swirl flows. For single-phase convection, both theoretical and experimental results obtained up to-day give rather clear understanding of the main mechanisms of energy and momentum transfer in tubes with twisted tape inserts. At one-side heating the high temperature azimuthal gradient exists at the inside surface, that requires the well-founded choice of reference temperature for physical properties used in calculations of HTC. Heat transfer in boiling of subcooled liquid in swirl flow at uniform heating can be successfully described by superposition of the known predicting equations for single-phase convection and nucleate boiling. Under one-side heating condition different heat transfer modes are observed along the circumference of the cooled channel. Practical recommendation on the prediction of HTC at nucleate boiling of subcooled liquid in swirl flow at one-side heating has been given in this paper. Boiling crisis in swirl flow at uniform heating can be prevented either by centrifugal body forces or by single-phase convection from the bubbly layer surface at the heated wall to the cold flow core. The greater from heat fluxes controlled by these two mechanisms determines CHF. At one-side heating in swirl flow CHF is essentially higher than under uniform heating condition. Based on the experimental measurements, the conclusion is stated that at high flow velocity and high liquid subcooling in swirl flow the thermodynamical limit of CHF has been achieved. (C) 2005 Elsevier Inc. All rights reserved.
机译：该讲座考虑了旋流的一般特征。对于单相对流，到目前为止获得的理论和实验结果都非常清楚地了解了带有扭曲带插入物的管中能量和动量传递的主要机理。在单侧加热时，内表面存在高温方位角梯度，这要求为HTC计算中使用的物理属性选择合理的参考温度。通过叠加已知的单相对流和成核沸腾预测方程，可以成功地描述均匀加热下涡流中过冷液体沸腾过程中的传热。在一侧加热条件下，沿着冷却通道的圆周观察到不同的传热模式。给出了在单侧加热条件下预测旋流中过冷液体成核沸腾HTC的实用建议。可以通过离心力或通过从受热壁处的气泡层表面到冷流芯的单相对流来防止均匀加热下旋流的沸腾危机。由这两种机制控制的热通量中的较大者决定了CHF。在旋流中单侧加热时，CHF基本上高于均匀加热条件下的CHF。根据实验测量结果得出结论，在高流速和涡流中较高的液体过冷度下，已经达到了CHF的热力学极限。 （C）2005 Elsevier Inc.保留所有权利。

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