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Research Papers: Fluid-Structure Interaction

Experiment Study on Fluidelastic Instability of Tube Bundles Consisting of Different Frequency Tubes With Visual Image Processing System

[+] Author and Article Information
Wei Tan

Professor
School of Chemical
Engineering and Technology,
Tianjin University,
Tianjin 300072, China
e-mail: wtan@tju.edu.cn

Zhao Li

School of Chemical
Engineering and Technology,
Tianjin University,
Tianjin 300072, China
e-mail: lizhaotju@tju.edu.cn

Hao Wu

School of Chemical
Engineering and Technology,
Tianjin University,
Tianjin 300072, China
e-mail: wwwhha@126.com

Yipeng Wang

School of Chemical
Engineering and Technology,
Tianjin University,
Tianjin 300072, China
e-mail: 15620975817@163.com

Yanfeng Zhang

China Machinery Industry Group Co. LTD,
Shanghai 201518, China
e-mail: 13909310265@163.com

Jiandong Zou

China Machinery Industry Group Co. LTD,
Shanghai 201518, China
e-mail: zoujdvip@126.com

Guorui Zhu

School of Chemical
Engineering and Technology,
Tianjin University,
Tianjin 300072, China
e-mail: zhuguorui@tju.edu.cn

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received October 19, 2017; final manuscript received February 14, 2018; published online April 10, 2018. Assoc. Editor: Tomomichi Nakamura.

J. Pressure Vessel Technol 140(3), 031302 (Apr 10, 2018) (9 pages) Paper No: PVT-17-1209; doi: 10.1115/1.4039454 History: Received October 19, 2017; Revised February 14, 2018

Fluidelastic instability (FEI) is the most harmful vibration mechanism for heat exchangers. Due to the inevitable manufacturing precision and assembly error, natural frequencies of tubes are not equal in the ideal condition. In order to describe the dispersion characteristic of tube bundles, a new factor named dispersion ratio is proposed in this paper. A series of tubes experiments in normal square and rotated triangular array with pitch ratio s = 1.4 and s = 1.28 were designed and conducted with high-speed camera and visual image processing system. Results show that FEI behaviors of tubes were greatly affected by tubes array geometry, pitch ratio, and dispersion ratio. Reduced critical velocity (Vcr) increased with dispersion ratio in normal square array but no obvious phenomenon was observed in rotated triangular array.

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References

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Figures

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Fig. 5

Schematic of flexible tubes and rigid tubes: (a) flexible tube and (b) rigid tube

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Fig. 1

Calculation model of Tanaka's theory, fi represents different natural frequency of tube bundle, respectively

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Fig. 6

Facilities and software of testing: (a) high-speed camera measuring system and (b) picture dealing software

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Fig. 4

Normal square array schematic, pitch ratio s = 1.4

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Fig. 3

Diagram of test section and tubes

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Fig. 2

Schematic of images processing system for vibration tests

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Fig. 7

Numbering rules of tubes: (a) normal square array and (b) rotated triangular array

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Fig. 8

Diagram of neighboring tubes and central tube: (a) normal square array and (b) rotated triangular array

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Fig. 9

Comparison of vibration with different experiments arrangement, tube bundle was normal square array, pitch ratio were s = 1.28 and s = 1.4, respectively: (a) squ-8-1.4, (b) squ-8-1.28, (c) squ-9-1.4, and (d) squ-9-1.28

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Fig. 10

Comparison of vibration with different experiments arrangement, tube bundle is rotated triangular array, pitch ratio were s = 1.28 and s = 1.4, respectively: (a) rtr-8-1.4, (b) rtr-8-1.28, (c) rtr-9-1.4, and (d) rtr-9-1.28

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Fig. 11

Mass damping ratio to reduced critical velocity: (a) mass damping ratio range from 0.1 to 100 and (b) detailed graph

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