Numerical Gas–Liquid Two-Phase Flow Regime Identification in a Horizontal Pipe Using Dynamic Pressure Data

Gas–liquid two-phase flow is very common in industrial pipelines. Flow regime identification is the first step to design, analyze, and operate the gas–liquid system successfully. The purpose of this study is to develop a methodology for identification of a two-phase flow regime using post signal pro...

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Bibliographic Details
Published in:Applied sciences 2023-01, Vol.13 (2), p.1225
Main Authors: Khan, Umair, Pao, William, Sallih, Nabihah
Format: Article
Language:English
Subjects:
Annular flow
Computational Fluid Dynamics
Dynamic pressure
Fast Fourier Transform
flow regime
Fourier transforms
Gas pipelines
Gas-liquid systems
Identification
Mathematical models
Methods
Multiphase flow
Numerical methods
Pipes
Pressure
Probabilistic Density Function
Probability density functions
Radiation
Signal processing
Statistical analysis
Tomography
Two phase flow
Wavelet transforms
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Summary:Gas–liquid two-phase flow is very common in industrial pipelines. Flow regime identification is the first step to design, analyze, and operate the gas–liquid system successfully. The purpose of this study is to develop a methodology for identification of a two-phase flow regime using post signal processing techniques, namely Fast Fourier Transform (FFT) and Probabilistic Density Function (PDF). Three different flow regimes were simulated in a 6 m horizontal pipe with a 0.050 m inner diameter. A Level-Set (LS) method coupled with Volume of Fluid (VOF) method is used to model the air–water interface. After validation of the numerical method, dynamic pressure readings were collected with the intent to identify the associated flow regimes by post-processing of these signals. It was concluded that dynamic pressure signals of different flow regimes show different characteristics (like dominant frequency, FFT amplitude, PDF location and PDF magnitude) in the time and frequency domains. These characteristics can be potentially used as differentiating factors to distinguish different flow regimes. This research is limited to stratified, slug, and annular flow in the horizontal pipe. This paper uses a new approach to identify the flow regime in a horizontal pipe by Fast Fourier Transform and Probability Density Function of dynamic pressure readings obtained by using numerical simulation.
ISSN:2076-3417
2076-3417
DOI:10.3390/app13021225