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Research Papers: Heat Exchangers

Investigation of Turbulent Flow and Heat Transfer in Periodic Wavy Channel of Internally Finned Tube With Blocked Core Tube

[+] Author and Article Information
Qiu-Wang Wang1

State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, Chinawangqw@mail.xtu.edu.cn

Mei Lin, Min Zeng, Lin Tian

State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China

1

Corresponding author.

J. Heat Transfer 130(6), 061801 (Apr 23, 2008) (7 pages) doi:10.1115/1.2891219 History: Received January 08, 2007; Revised July 26, 2007; Published April 23, 2008

Three-dimensional complex turbulent flow and heat transfer of internally longitudinally finned tube with blocked core tube and streamwise wavy fin are numerically investigated. The numerical method is validated by comparing the calculated results with corresponding experimental data. The effects of both wave height and wave distance on heat transfer performance are examined. The range of wave height to hydraulic diameter ratio is from 0.61 to 2.45, and that of wave distance to hydraulic diameter ratio is from 3.06 to 14.69, while that of Reynolds number is from 904 to 4520. The computational results demonstrate that the Nusselt number and friction factor increase with the increase of the wave height, while they decrease with the increase of the wave distance. Furthermore, general correlations are proposed to describe the performance of the wavy configuration for 904Re4520, 0.61sde2.45, 6.12lde11.02, with the mean deviations for heat transfer and friction factor correlations being 2.8% and 1.9%, respectively.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figure 1

Schematic of internally finned tube: (a) streamwise wavy fins (not to scale), (b) cross-sectional view of internally finned tube, and (c) one periodic streamwise wavy channel

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Figure 2

Schematic of the computational domain

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Figure 3

Schematic of experimental system

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Figure 4

Comparisons of Nusselt number and friction factor between experimental data and numerical predictions with various turbulence models: (a) Nu versus Re and (b) f versus Re

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Figure 5

Computational results for three meshes under different Reynolds number: (a) Nu versus grid nodes and (b) f versus grid nodes

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Figure 6

Variation of Nusselt number and friction factor with wave distance under moderate Reynolds number (Re=2713): (a) Nu versus l∕de and (b) f versus l∕de

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Figure 7

Comparisons of Nusselt number and friction factor with Reynolds number among correlation, experimental data and numerical results: (a) Nu versus Re and (b) f versus Re

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Figure 8

Comparisons of Nusselt number and friction factor with Reynolds number between correlation and numerical results with different wave numbers (N=20): (a) Nu versus Re and (b) f versus Re

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Figure 9

Comparisons of Nusselt number and friction factor with Reynolds number between correlation and numerical results with different inner diameters (do=12mm): (a) Nu versus Re and (b) f versus Re

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Figure 10

Eddy formation at transverse and streamwise sections (Re=2713 and s∕de=1.59, l∕de=7.95): (a) transverse section (z*=0.25) and (b) streamwise section (y*=0.5)

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