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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：多双绞线中的热液压性能插入了用于废气热回收应用的正弦肋管热交换器

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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：本文介绍了基于废气热回收背景的多双绞线（MTTS）插入的正弦肋管（SRT）热交换器的湍流热和流体流动特性的数值研究。在SRT中的磁带编号（单个，双，三倍和四倍双绞线）和磁带装置（顺时针和逆时针或同旋转和反旋涡）的效果相当于研究。采用周期性的RNG K-EPSILON数值模型来描绘在恒定壁温度条件下SRT中的传热行为和流动结构。结果表明，单独使用SRT产生的热传递约27.4％-39.5％，摩擦损失增加约49.4％-74.7％-74.7％，高于螺旋波纹管（SCT）的基线。此外，发现安装有MTTS的SRT的多样的热液压性能由旋流和剪切流的流动结构主导。通过SRT和MTTS的纵向涡旋的协同作用，从拟合MTTS的SRT获得的营养数和摩擦因子分别大于SCT，大约1.43-1.87倍和2.66-10.07倍。与SCT相比，单独使用SRT的总热性能评估标准（PEC）增强至1.59。此外，通过安装在安装有MTT的SRT的合适的胶带布置，可以在增加的传热和合理的压降下改善PEC，其中最佳PEC为1.49。最后，通过先前研究的现状比较证明，提出的增强设备具有一些竞争优势。

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