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Effect of outline curvature degree on heat transfer and flow characteristics inside dimpled tubes and spirally grooved tubes

机译：轮廓曲率曲率对凹管和螺旋槽管内传热和流动特性的影响

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摘要

The flow behaviors and heat transfer characteristics have been studied inside the dimpled tubes and spirally grooved tubes with different curvature degrees, which is considered for the first time within the influence factors. A three-dimensional numerical simulation by periodic boundary conditions is performed to model the fully developed flow of dimpled and grooved sections to acquire the finer mesh and more accurate results. In addition, the dimple and groove outlines with different curvature degrees are generated by polynomial functions. Effects of curvature degrees for dimpled tubes and spirally grooved tubes on flow, heat transfer, and comprehensive performances are discussed. The results indicate that the influence of curvature degrees for dimpled tubes exhibit an opposite behavior when compared with those for spirally grooved tubes. On the whole, all performance factors increase with the growing curvature degree for dimpled tubes but decrease with the increasing curvature degree for spirally grooved tubes. By comparing different curvature degrees, the maximum ranges of heat transfer enhancement are 1.50-2.22 and 2.54-2.82, respectively, for dimpled and grooved tubes with respect to Re. Thermal and hydraulic fields are considered to analyze the mechanism of heat transfer enhancement. The analysis shows that the way the dimple changes thermohydraulic properties differs from the way the groove changes the properties.
机译：已经研究了流动性和传热特性，并在凹坑管内和具有不同曲率度的螺旋槽管，这是在影响因素内首次考虑的。通过定期边界条件进行三维数值模拟，以模拟完全发育的凹槽和沟槽部分的流动，以获取更精细的网格和更准确的结果。另外，具有不同曲率度度的凹坑和凹槽轮廓由多项式函数产生。讨论了凹浊管和螺旋槽管对流动，传热和综合性能的影响。结果表明，与螺旋槽管的管相比，凹形凹管曲率测度对曲率的影响表现出相反的行为。总的来说，所有性能因素随着凹陷管的越来越多的曲率增加而增加，但随着螺旋槽管的曲率增加而降低。通过比较不同的曲率度，分别为凹陷和带槽管的传热增强的最大范围分别为1.50-2.22和2.54-2.82。认为热量和液压田地分析热传递增强机制。分析表明，凹坑变化的方式从凹槽改变性质的方式不同。

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