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Research Papers: Fluid-Structure Interaction

Fluidelastic Vibration Analysis of Normal Square Finned Tube Arrays in Water Cross Flow

[+] Author and Article Information
Sandeep R. Desai, Aslam A. Maniyar

Department of Automobile Engineering,
K.E.S.'s Rajarambapu Institute of Technology,
Affiliated to Shivaji University,
Kolhapur 415414, India

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received September 2, 2018; final manuscript received March 9, 2019; published online April 4, 2019. Assoc. Editor: Marwan A. Hassan.

J. Pressure Vessel Technol 141(3), 031301 (Apr 04, 2019) (8 pages) Paper No: PVT-18-1176; doi: 10.1115/1.4043187 History: Received September 02, 2018; Revised March 09, 2019

An experimental program was carried out by subjecting normal square finned tube arrays to gradually increasing water cross flows. In all, total six tube arrays were tested—three having pitch ratio 2.1 and remaining three of pitch ratio 2.6. Under each category, three arrays tested were: plain array, coarse finned array, and fine finned array. The objective of the research was to determine the fluid velocity at which each of the six arrays becomes fluidelastically unstable. The experiments were started with tests on plain arrays to establish them as a datum case by comparing their test results with published results on plain arrays having lower pitch ratios. This was then followed by testing of finned arrays to study the effect of fins on the instability threshold. The tubes were subjected to a gradually increasing flow rate of water from 10 m3/h to the point where instability was reached. The results of the present work are compared with author's earlier published results for parallel triangular arrays in water. The research outcomes help to study the effect of pitch ratio, tube array pattern, and fin density on the instability threshold. The results show that instability is delayed due to the addition of the fins. It is also concluded that normal square arrays should be preferred over parallel triangular arrays to avoid fluidelastic vibrations. The vortex shedding behavior studied for all the arrays shows that small peaks before fluidelastic instability are due to vortex shedding.

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References

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Figures

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Fig. 1

Spiral crimped type fin shape

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Fig. 2

Test setup for free vibration testing

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Fig. 3

Test facility for fluidelastic instability experiments [12]

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Fig. 4

Cross-sectional view of the test section: (a) end view and (b) front view

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Fig. 5

Comparison of vibration response of arrays with XP = 2.1

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Fig. 6

Comparison of vibration response of arrays with XP = 2.6

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Fig. 7

Strouhal numbers for normal square tube arrays

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Fig. 8

Stability map for tube arrays with Xp = 2.1

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Fig. 9

Stability map for tube arrays with Xp = 2.6

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