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Numerical study of heat transfer and friction factor in a tube with groove and rib on the Avail

机译：沟槽和肋条带传热和摩擦系数的数值研究

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摘要

Heat transfer and friction factor in a tube with turbulator internally grooved and rib are studied using numerical simulation. Two different turbulator geometries, including only groove and both groove and rib, on the tube wall are investigated. The study is developed for different parameters of turbulator including pitch ratio (PR), groove and rib height (DR.), and Reynolds number in the range of 10 000 to 38 000. The results revealed that the best Nusselt number is achieved for GR turbulator and for the tube wall with PR = 2 and DR = 1. Furthermore, for a specific turbulator parameter, Nusselt number is improved by 46% compared with the experimental result. The results show that the friction factor decreases by increase of both step and height ratios. For example, based on Reynolds number, 21% to 69% reduction in the friction factor was observed for PR = 7 and DR = 3. In addition, the correlations for Nusselt number and friction factor with acceptable deviation are presented for the studied turbulators. Finally, thermal performance enhancement factor is defined to be a good criterion for selection of the optimum turbulator and their parameters.
机译：使用数值模拟研究了具有湍流仪内部凹槽和肋的管中的传热和摩擦系数。研究了两种不同的湍流器几何形状，包括在管壁上的凹槽和沟槽和肋骨。该研究是为湍流器的不同参数开发，包括音调比（PR），凹槽和肋骨高度（DR.），并且雷诺数在10 000至38 000的范围内。结果表明，GR的最佳营养数湍流器和具有PR = 2的管壁和DR = 1。此外，对于特定的湍流器参数，与实验结果相比，NUSERET数提高了46％。结果表明，摩擦因子通过阶跃和高度比率的增加而降低。例如，基于雷诺数，对PR = 7观察到摩擦因子的21％至69％，并且还为所研究的湍流器提出了具有可接受的偏差的泡沫数和摩擦因子的相关性。最后，热性能增强因子被定义为选择最佳湍流器及其参数的良好标准。

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