Numerical study on flow and heat transfer characteristics in corrugated tube with loose-fit twisted tape insert

doi:10.11949/j.issn.0438-1157.20170376

Abstract

Abstract:

The flow and heat transfer characteristics of a novel kind of loose-fit twisted insert (CLT) are studied by RNG k-ε numerical method. The verification has been conducted to compare the numerical and the experimental results of Manglik and Bergles. The difference of flow and heat transfer characteristic is investigated by comparing between CLT and corrugated tube with loose-fit twisted tape insert (SLT). Finally, the effect of twisted ratio and clearance ratio for the flow and heat transfer characteristics is investigated in CLT. The results show that compared with the traditional SLT, the heat transfer performance in CLT increases by 1.17 times and the maximum increasing of absolute value for overall heat transfer performance is 0.15. The overall heat transfer performance in CLT increases with the increasing twisted ratio, but the increasing slope decreases gradually, meanwhile, the decreasing extent is more obvious in high Reynolds number. Meanwhile, the overall heat transfer performance in CLT decreases with the increasing clearance ratio, and the decreasing slope also decreases gradually. The decreasing extent is very obvious at the range of low Reynolds number, however, the values of overall heat transfer performance decrease slightly at the range of high Reynolds number. Take into consideration for various factors, low clearance ratio of twisted tape should be selected at the range of low Reynolds number, the high one is suitable for high Reynolds number.

Key words: corrugated tube with loose-fit twisted tape insert, RNG k-ε model, numerical simulation, flow and heat transfer characteristics, overall heat transfer performance

摘要：

采用RNG k-ε数值模拟方法研究一种新型内插松弛扭带波节管（CLT）的流动与传热特性。将数值模拟结果与自建实验台的实验结果进行了对比验证；比较了CLT和内插松弛扭带光管（SLT）的传热性能差异；考察了CLT中扭率和余隙比对流动和传热特性的影响规律。研究结果表明CLT相比于传统的SLT，传热性能最多提高1.17倍，综合传热性能的绝对数值最多增加0.15。CLT的综合传热性能随着扭率的增加而增加，而增加的幅度却逐渐减小，高Reynolds数时减小的程度更加显著。同时，综合传热性能随着余隙比的增大而降低并且降低的幅度也逐渐减小，在低Reynolds数时明显降低，而在高Reynolds数时略微降低。综合考虑，低Reynolds数时应该选择余隙比低的扭带，而高Reynolds数时则应选择余隙比高的扭带。

关键词: 内插松弛扭带波节管, RNG k-ε模型, 数值模拟, 流动和传热特性, 综合传热性能

CLC Number:

TQ028.8

HAN Huaizhi, CHEN Xin, HU Yiran, WANG Kunfang, CUI Yunlei, YU Ruitian. Numerical study on flow and heat transfer characteristics in corrugated tube with loose-fit twisted tape insert[J]. CIESC Journal, 2018, 69(4): 1374-1384.

韩怀志, 陈鑫, 胡怡然, 王坤芳, 崔运磊, 于瑞天. 内插松弛扭带波节管的流动与传热特性的数值模拟[J]. 化工学报, 2018, 69(4): 1374-1384.

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