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Detecting gas-liquid two-phase flow pattern determinism from experimental signals with missing ordinal patterns.

Meng Du1, Lei Zhang1, Xiangyang Niu1

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Summary
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This study investigates determinism in gas-liquid two-phase flow systems. Findings reveal insights into flow pattern dynamics and transitions using ordinal patterns and a stretched exponential model.

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Area of Science:

  • Fluid Dynamics
  • Nonlinear Dynamics
  • Chaos Theory

Background:

  • Gas-liquid two-phase flow systems exhibit complex dynamics.
  • Understanding flow pattern transitions is crucial for industrial applications.
  • Determinism in such systems remains an area of active research.

Purpose of the Study:

  • To determine the presence of deterministic behavior in gas-liquid two-phase flow.
  • To analyze the dynamics of different flow patterns and their transitions.
  • To explore the application of ordinal pattern analysis and stretched exponential models.

Main Methods:

  • Gas-liquid two-phase flow experiments were conducted to collect flow pattern fluctuation signals.
  • The number of missing ordinal patterns was calculated to assess phase space partitioning and determinism.
  • A stretched exponential model was employed to characterize flow pattern transition behavior.

Main Results:

  • Deterministic characteristics were identified in the dynamics of various gas-liquid flow patterns.
  • The stretched exponential model effectively revealed flow pattern transition dynamics.
  • Joint distribution analysis of decay rate and stretching exponent provided insights into flow evolution.

Conclusions:

  • The study confirms the existence of determinism in gas-liquid two-phase flow dynamics.
  • Novel insights into flow pattern evolution and transitions were provided.
  • The methodology offers potential for analyzing more complex fluid systems.