An Experimental and Numerical Study of Heat Transfer and Flow Characteristics of Laminar Flow in a Circular Tube With Wedge-Shaped Wavy-Tape Inserts

Volume 8B: Heat Transfer and Thermal Engineering Pub Date : 2018-11-09 DOI:10.1115/IMECE2018-88335

Yunmin Liang, Peng Liu, Nianben Zheng, F. Shan, Zhichun Liu, Wei Liu

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引用次数: 1

Abstract

In this study, a new type of tube inserts, named wedge-shaped wavy-tape insert, which is designed from bionics based on the movement of cuttlefish, is reported. The numerical simulation was carried out to investigate the effects of wedge-shaped wavy-tape insert arrangements on the heat transfer and flow characteristics of laminar flow in a circular tube under constant heat flux conditions. Details of the flow structures in the circular tube with wedge-shaped wavy-tape inserts which are arranged in same phase (S-type wavy tape) and different phase (D-type wavy tape) were presented and analyzed respectively. Then stereoscopic particle image velocimetry (Stereo-PIV) measurements on the flow structures were conducted to verify the numerical results. The flow structures obtained through simulations and PIV measurements agree well. It was observed that the arrangements of wedge-shaped wavy-tape inserts have a significant influence on the thermo-hydraulic performance. The average friction factor enhancement ratio f/f0 of D-type wavy tape were about 14%–20% lower than S-type wavy tape, but average heat transfer enhancement ratio Nu/Nu0 of D-type wavy tape were about 7%–14% higher than S-type wavy tape. The best performance evaluation criterion of D-type wavy tape could be improved to 3.02. The result shown the wedge-shaped wavy-tape insert is a promising technique for laminar convective heat transfer enhancement.

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楔形波带插入圆管内层流传热与流动特性的实验与数值研究

本文报道了一种基于墨鱼运动的仿生学设计的新型插管器——楔形波带插管器。采用数值模拟的方法研究了等热流密度条件下楔形波带插入方式对圆管内层流传热和流动特性的影响。对楔形波带插片同相(s型波带)和不同相(d型波带)的圆管内流动结构进行了详细分析。然后对流动结构进行了立体粒子图像测速(Stereo-PIV)测试，验证了数值结果。模拟得到的流动结构与PIV测量结果吻合较好。结果表明，楔形波带嵌件的布置方式对热工性能有显著影响。d型波纹带的平均摩擦因数增强比f/f0比s型波纹带低14% ~ 20%，而d型波纹带的平均传热增强比Nu/Nu0比s型波纹带高7% ~ 14%。将d型波浪形胶带的最佳性能评价标准提高到3.02。结果表明，楔形波带插入是一种很有前途的强化层流对流换热技术。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Volume 8B: Heat Transfer and Thermal Engineering

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