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Technical Brief

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

[+] Author and Article Information
Longbin Yang

College of Power and Energy Engineering,
Harbin Engineering University,
145 Nan tong Street,
Nan Gang District,
Harbin 150001, China
e-mail: yanglb_hrbeu@163.com

Huaizhi Han

College of Power and Energy Engineering,
Harbin Engineering University,
145 Nan tong Street,
Nan Gang District,
Harbin 150001, China
e-mail: hanhz_hrbeu@163.com

Yanjun Li

College of Power and Energy Engineering,
Harbin Engineering University,
145 Nan tong Street,
Nan Gang District,
Harbin 150001, China
e-mail: liyj_hrbeu@163.com

Xiaoming Li

College of Power and Energy Engineering,
Harbin Engineering University,
145 Nan tong Street,
Nan Gang District,
Harbin 150001, China
e-mail: lixiaoming7725@hrbeu.edu.cn

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received July 31, 2014; final manuscript received July 11, 2015; published online September 2, 2015. Assoc. Editor: Sujoy Kumar Saha.

J. Heat Transfer 138(2), 024501 (Sep 02, 2015) (8 pages) Paper No: HT-14-1502; doi: 10.1115/1.4031171 History: Received July 31, 2014; Revised July 11, 2015

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-ε 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 (Nuc/Nus), ratio of friction factor (f/fs), and overall heat transfer performance (η) 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.

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Figures

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Fig. 1

Geometry of round tubes with TT insert: (a) ST with TT and (b) CT with TT

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Fig. 2

Simulation meshing of smooth and corrugated round tubes with TT inserts: (a) ST with TT, (b) CT with TT, and (c) skewness measure of meshing

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Fig. 3

Effect of element spacing for grid independent analysis

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Fig. 4

Comparison between numerical simulation and experimental function

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Fig. 5

Comparison of CT and ST heat transfer performance

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Fig. 6

Three different profiles in the corrugation

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Fig. 7

Comparison of ST and CT velocity vector plots

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Fig. 8

Comparison of ST and CT temperature contour plots

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Fig. 9

Comparison of ST and CT TKE contour plots

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