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Research Papers: Gas Turbines: Microturbines and Small Turbomachinery

CFD Optimization of Gas-Side Flow Channel Configuration Inside a High Temperature Bayonet Tube Heat Exchanger With Inner and Outer fins

[+] Author and Article Information
Ting Ma, Min Zeng, Yanpeng Ji

Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education,  Xi’an Jiaotong University, Xi’an, Shaanxi, 710049, China

Qiuwang Wang1

Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education,  Xi’an Jiaotong University, Xi’an, Shaanxi, 710049, Chinawangqw@mail.xjtu.edu.cn

1

Corresponding author.

J. Eng. Gas Turbines Power 133(12), 122301 (Sep 01, 2011) (9 pages) doi:10.1115/1.4004014 History: Received April 10, 2011; Accepted April 11, 2011; Published September 01, 2011; Online September 01, 2011

In this paper, the gas-side fluid flow distribution inside a bayonet tube heat exchanger with inner and outer fins is numerically studied. The heat exchanger is designed based on the traditional bayonet tube heat exchanger, where compact continuous plain fins and wavelike fins are mounted on the outside and inside surfaces of outer tubes, respectively, to enhance the heat transfer performance. However, gross flow maldistribution and large vortices are observed in the gas-side flow channel of baseline design. In order to improve the flow uniformity, three modified designs are proposed. Three vertical plates and two inclined plates are mounted on the inlet manifold for Model B. For the Model C, another six bending plates are mounted on the middle manifolds and three pairs of them are connected together. The Model D has a similar structure as Model C except for the two additional baffles. The results indicate that the flow distributions of Models C and D are much more uniform under different inlet Reynolds number, especially in the high inlet Reynolds number. Although the flow distribution of Model D is the best, its pressure drop is 2.6 times higher than that of Model C. Therefore, the design of Model C is the most optimized structure. Compared with the original design, the nonuniformity of Model C can be reduced by 42% while the pressure drop is almost the same under the baseline condition.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 3

Grid independence test

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Figure 4

Model of plain finned tubes in a straight channel

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Figure 5

Validation of plain finned tubes in a straight channel

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Figure 6

3D and 2D models with 18 channels for validation: (a) Full-sized 3D model with 18 channels. (b) 2D porous media model with 18 channels.

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Figure 7

Comparison of porous media and detailed models

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Figure 8

Mass flow distributions of Model A under different temperatures

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Figure 9

Velocity distributions of different models: (a) Model A. (b) Model B. (c) Model C. (d) Model D.

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Figure 10

Mass flow distributions of 2# channels: (a) Model A. (b) Model B. (c) Model C. (d) Model D.

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Figure 11

Pressure distributions of different models: (a) Model A. (b) Model B. (c) Model C. (d) Model D.

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Figure 12

Nonuniformity of mass flow rate versus inlet Reynolds number

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Figure 13

Pressure drops versus inlet Reynolds number

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Figure 2

Sketch of four different design models: (a) Model A. (b) Model B. (c) Model C. (d) Model D.

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Figure 1

Sketch of bayonet tube HTHE with inner and outer fins

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