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Convective Heat Transfer Enhancement Inside Tubes Using Inserted Helical Coils

机译:使用插入的螺旋线圈增强管内对流传热

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Convective heat transfer was experimentally investigated in tubes with helical coils inserts in turbulent flow regime within Reynolds number range of 14400 ≤ Re ≤ 42900. The present work aims to extend the experimental data available on wire coil inserts to cover wire diameter ratio from 0.044 to 0.133 and coil pitch ratio from 1 to 5. Uniform heat flux was applied to the external surface of the tube and air was selected as fluid. The effects of Reynolds number and wire diameter and coil pitch ratios on the Nusselt number and friction factor were studied. The enhancement efficiency and performance criteria ranges are of (46.9-82.6%) and (100.1 - 128%) within the investigated range of the different parameters, respectively. Correlations are obtained for the average Nusselt number and friction factor utilizing the present measurements within the investigated range of geometrical parameters and Re.
机译:在具有雷诺数范围14400≤Re≤42900的湍流状态下,对带有螺旋形线圈插入件的管子中的对流换热进行了实验研究。本工作的目的是将线绕插入物的可用实验数据扩展到覆盖线径比从0.044到0.133线圈的螺距比为1到5。均匀的热通量施加到管的外表面,并选择空气作为流体。研究了雷诺数,线径和线圈螺距比对努塞尔数和摩擦系数的影响。在不同参数的研究范围内,增强效率和性能标准范围分别为(46.9-82.6%)和(100.1-128%)。利用所研究的几何参数和Re范围内的当前测量值,可以获得平均努塞尔数和摩擦系数的相关性。

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