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首页> 外文期刊>Energy Conversion & Management >Thermal-hydraulic performances in multiple twisted tapes inserted sinusoidal rib tube heat exchangers for exhaust gas heat recovery applications
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Thermal-hydraulic performances in multiple twisted tapes inserted sinusoidal rib tube heat exchangers for exhaust gas heat recovery applications

机译：用于排气热回收应用的多条扭曲带插入正弦肋管式热交换器的热工液压性能

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摘要

The article presents a numerical investigation on turbulent thermal and fluid flow characteristics of multiple twisted tapes (MTTs) inserted sinusoidal rib tube (SRT) heat exchangers based on exhaust gas heat recovery background. The effects including geometric parameters of tape number (single, twin, triple and quadruple twisted tapes) and tape arrangements (clockwise and anticlockwise or co-swirl and counter-swirl) in the SRT were comparably studied. A periodic RNG k-epsilon numerical model was employed to depict the heat transfer behaviors and flow structures in the SRTs at a constant wall temperature condition. The results showed that the alone use of the SRT yielded enhanced heat transfer of about 27.4%-39.5% and increased friction loss of around 49.4%-74.7% higher than that in the baseline of spirally corrugated tube (SCT). In addition, it was found that the diverse thermo-hydraulic performances in the SRTs fitted with MTTs were dominated by flow structures of swirl flows and shear flows. By the synergy of longitudinal vortexes from SRT and MTTs, the Nusselt number and friction factor obtained from the SRTs fitted with MTTs were, respectively, larger than that from SCT at about 1.43-1.87 times and 2.66-10.07 times. In contrast to the SCT, the overall thermal performance evaluation criterion (PEC) was enhanced up to 1.59 for the alone use of SRT. Moreover, the PEC could be improved under increased heat transfer and reasonable pressure drop via suitable tape arrangements in the SRTs mounted with MTTs, of which the best PEC was 1.49. At last, the comparisons of present results with previous studies proved that the proposed enhanced devices held some competitive advantages.
机译：本文基于废气热回收背景，对插入了正弦肋管（SRT）热交换器的多条扭曲带（MTT）的湍流热和流体流动特性进行了数值研究。比较研究了SRT中磁带编号（单，双，三重和四重扭曲磁带）的几何参数和磁带排列（顺时针和逆时针或同向旋转和反向旋转）的影响。周期性的RNGk-ε数值模型用于描述在恒定壁温条件下SRT中的传热行为和流动结构。结果表明，与螺旋波纹管（SCT）的基线相比，单独使用SRT可以产生约27.4％-39.5％的增强传热，并增加约49.4％-74.7％的摩擦损失。此外，还发现配备MTT的SRT中的各种热工液压性能受旋流和剪切流的流动结构支配。通过来自SRT和MTT的纵向涡流的协同作用，从装有MTT的SRT获得的Nusselt数和摩擦系数分别比从SCT获得的Nusselt数和摩擦系数大1.43-1.87倍和2.66-10.07倍。与SCT相比，单独使用SRT的总体热性能评估标准（PEC）提高到1.59。此外，可以通过在装有MTT的SRT中通过适当的胶带布置在增加的热传递和合理的压降下改善PEC，其中最佳PEC为1.49。最后，将当前结果与以前的研究进行比较证明，所提出的增强型设备具有一定的竞争优势。

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