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Research Papers: Multiphase Flows

Analysis of Flow-Induced Vibration Due to Stratified Wavy Two-Phase Flow

[+] Author and Article Information
Shuichiro Miwa

Graduate School of Engineering,
Hokkaido University,
North 13 West 8,
Kita-ku, Sapporo 060-8628, Japan
e-mail: smiwa@eng.hokudai.ac.jp

Takashi Hibiki

Mem. ASME
School of Nuclear Engineering,
Purdue University,
400 Central Dr.,
West Lafayette, IN 47907-2017
e-mail: Hibiki@purdue.edu

Michitsugu Mori

Graduate School of Engineering,
Hokkaido University,
North 13 West 8,
Kita-ku, Sapporo 060-8628, Japan
e-mail: michitsugu.mori@eng.hokudai.ac.jp

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received March 16, 2015; final manuscript received April 2, 2016; published online May 30, 2016. Assoc. Editor: Samuel Paolucci.

J. Fluids Eng 138(9), 091302 (May 30, 2016) (9 pages) Paper No: FE-15-1176; doi: 10.1115/1.4033371 History: Received March 16, 2015; Revised April 02, 2016

Fluctuating force induced by horizontal gas–liquid two-phase flow on 90 deg pipe bend at atmospheric pressure condition is considered. Analysis was conducted to develop a model which is capable of predicting the peak force fluctuation frequency and magnitudes, particularly at the stratified wavy two-phase flow regime. The proposed model was developed from the local instantaneous two-fluid model, and adopting guided acoustic theory and dynamic properties of one-dimensional (1D) waves to consider the collisional force due to the interaction between dynamic waves and structure. Comparing the developed model with experimental database, it was found that the main contribution of the force fluctuation due to stratified wavy flow is from the momentum and pressure fluctuations, and collisional effects. The collisional effect is due to the fluid–solid interaction of dynamic wave, which is named as the wave collision force. Newly developed model is capable of predicting the force fluctuations and dominant frequency range with satisfactory accuracy for the flow induced vibration (FIV) caused by stratified wavy two-phase flow in 52.5 mm inner diameter (ID) pipe bend.

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References

Figures

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Fig. 1

Schematic of the FIV experimental facility

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Fig. 2

Schematic of the FIV test section and force transducers location

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Fig. 3

Horizontal two-phase flow regimes: (a) bubbly flow, (b) slug flow, (c) stratified flow, (d) stratified wavy flow, and (e) annular flow shown on Mandhane's flow regime map along with experimental conditions

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Fig. 4

Liquid fraction signal observed in stratified wavy two-phase flow at liquid superficial velocity (jf) = 0.548 m/s and gas superficial velocity (jg) = 12.2 m/s

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Fig. 5

Iso-contour plot of pressure distribution around the elbow surface in stratified wavy two-phase flow at liquid superficial velocity (jf) = 0.548 m/s and gas superficial velocity (jg) = 12.2 m/s

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Fig. 6

Force fluctuation signal observed in stratified wavy two-phase flow at liquid superficial velocity (jf) = 0.548 m/s and gas superficial velocity (jg) = 12.2 m/s

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Fig. 7

Comparison of peak force fluctuation PSD amplitude and momentum flux with respect to superficial gas velocity

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Fig. 8

Proposed simplified model representing a single wave cycle of stratified wavy two-phase flow

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Fig. 9

Correlation to calculate maximum void fraction at current test section

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Fig. 10

Schematic of the dynamic wave propagation in stratified wavy flow

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Fig. 11

Spectral for wavy flow regime of momentum, pressure, and wave collision force terms compared with experimental data

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Fig. 12

Evaluation of Eqs. (5) and (23) for wavy flow regime with experimental data

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Fig. 13

Peak frequency predictive capability of the model with respect to mean void fraction measurement

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Fig. 14

Peak force amplitude magnitude predictive capability of the model with and without wave collision force term

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