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首页> 外文期刊>International Journal of Thermal Sciences >A comparative study on the thermal performance of water in a circular tube with twisted tapes, perforated twisted tapes and perforated twisted tapes with alternate axis
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A comparative study on the thermal performance of water in a circular tube with twisted tapes, perforated twisted tapes and perforated twisted tapes with alternate axis

机译：具有扭带的圆管中水的热性能的比较研究，具有交替轴的穿孔捻胶带和穿孔扭曲

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摘要

The effect of perforated twisted tapes with alternate axis (PATT), perforated twisted tapes (PTT) and regular twisted tapes (TT) with twist ratios (TR) of 3,4 and 5 are compared by experimental investigation in a circular tube under constant heat flux condition. Using water as the testing fluid, experiments are conducted within the Reynolds number range of 3000–16000. The heat transfer rates in the tube fitted with PATT, PTT and TT are respectively improved up to 48.12%, 44.3% and 33% of that in the plain tube. Similarly, the increase in friction factor for PATT, PTT and TT is 19.1%, 17.6% and 15.85% respectively, compared to that of the plain tube. For all inserts, the empirical correlations were established for Nusselt number and friction factor along with plain tube and the obtained correlations are fitted with the experimental data. At constant pumping power, the maximum thermal performance factor obtained is 1.433, 1.396 and 1.24 respectively for PATT, PTT and TT. Hence, the passive element which gives better energy efficiency along with lower operating cost is suggested for practical heat transfer applications.
机译：通过在恒定热量下的圆形管中的实验研究比较穿孔扭转胶带（Patt），穿孔扭胶（PTT）和常规扭转胶带（TT）的扭曲比（TR）的效果，并在恒定热的圆管中进行了比较了3,4和5的通量条件。用水作为测试流体，实验在3000-16000的雷诺数范围内进行。在普通管中分别高达48.12％，44.3％和33％的管中的管中的热传递速率分别提高。同样，与平原管相比，Patt，PTT和TT的摩擦因子的增加分别为19.1％，17.6％和15.85％。对于所有插入物，建立了对Nusselt数量和摩擦系数以及普通管的经验相关性，并且所获得的相关性配备实验数据。在恒定的泵送功率下，对于Patt，PTT和TT分别获得的最大热性能因数分别为1.433,1.396和1.24。因此，对于实际传热应用，提出了一种提供更好能量效率以及较低的操作成本的无源元件。

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