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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 enhancement in a tube with equilateral triangle cross sectioned coiled wire inserts
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Heat transfer enhancement in a tube with equilateral triangle cross sectioned coiled wire inserts

机译：具有等边三角形横截面的盘绕钢丝插件的管中的传热增强

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摘要

The heat transfer and pressure drop were experimentally investigated in a coiled wire inserted tube in turbulent flow regime. The coiled wire has equilateral triangular cross section and was inserted separately from the tube wall. The experiments were carried out with three different pitch ratios (P/D = 1, 2 and 3) and two different ratio of equilateral triangle length side to tube diameter (a/D = 0.0714 and 0.0892) at a distance (s) of 1 mm from the tube wall in the range of Reynolds number from 3500 to 27,000. Uniform heat flux was applied to the external surface of the tube and air was selected as fluid. The experimental results obtained from a smooth tube were compared with those from the studies in literature for validation of experimental set-up. The use of coiled wire inserts leads to a considerable increase in heat transfer and pressure drop over the smooth tube. The Nusselt number rises with the increase of Reynolds number and wire thickness and the decrease of pitch ratio. The highest overall enhancement efficiency of 36.5% is achieved for the wire with a/D = 0.0892 and P/D = 1 at Reynolds number of 3858. Consequently, the experimental results reveal that the best operating regime of all coiled wire inserts is detected at low Reynolds number, leading to more compact heat exchanger.
机译：在湍流状态下，在盘绕的插入管中对传热和压降进行了实验研究。线圈导线的横截面为等边三角形，并且与管壁分开插入。实验以三种不同的螺距比（P / D = 1、2和3）和两种不同的等边三角形长度边与管径之比（a / D = 0.0714和0.0892）在距离（s）为1处进行距管壁的毫米数，雷诺数范围为3500至27,000。将均匀的热通量施加到管的外表面，并选择空气作为流体。从光滑管获得的实验结果与文献中的研究结果进行了比较，以验证实验设置。盘绕金属丝插入物的使用导致光滑管上的热传递和压降显着增加。随着雷诺数和线粗的增加以及螺距比的减小，努塞尔数随之增加。当雷诺数为3858时，a / D = 0.0892和P / D = 1的焊丝可获得最高的36.5％的整体增强效率。因此，实验结果表明，所有盘绕焊丝插入件的最佳工作状态均在雷诺数低，导致热交换器更紧凑。

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