A Numerical Study of the Flow and Heat Transfer Characteristics of Outward Convex Corrugated Tubes With Twisted-Tape Insert

作者：Yang, Longbin; Han, Huaizhi^*; Li, Yanjun; Li, Xiaoming

来源：Journal of Heat Transfer, 2016, 138(2): 024501.

DOI：10.1115/1.4031171

• CT
• surface-based
• fluid-based
• RNG k-epsilon model
• overall heat transfer performance

This work presents a mathematical model for simulating the swirling flow in an outward convex corrugated tube with twisted-tape insert (CT). The synergistic effect on the flow, heat transfer, and friction loss behaviors between the surface-based and fluid-based enhancements is numerically investigated. Renormalized group (RNG) k-epsilon turbulence model applied in our paper is verified by comparing with experimental results investigated by Manglik and Bergles. Comparisons of the CT and smooth tube with twisted-tape insert (ST) plots are confirmed to investigate the performance differences between them. When comparing the performance of the CT against the ST, the maximum ratio of Nusselt number (Nu(c)/ Nu(s)), ratio of friction factor (f/ f(s)), and overall heat transfer performance (eta) values realized in the CT are 1.36, 1.53, and 1.15 times higher, respectively, than the maximum values for those same variables in the ST.

• 出版日期2016-2
• 单位哈尔滨工程大学