Near-field leakage characterisation of high-pressure CO2 pipeline

Articles in Press

Document Type : Research Article

Authors

College of Petroleum Engineering, Liaoning Shihua University, Fushun , China

Abstract

This study investigates the multiphase leakage dynamics of high-pressure CO2 pipelines under near-field conditions, focusing on safety risks posed by phase transitions and Joule-Thomson cooling during accidental releases. A novel CFD-based real gas model is developed, integrating the Span-Wagner (S-W) and Peng-Robinson (P-R) equations of state to accurately capture liquid-vapor phase behavior. The Eulerian mixing model with user-defined functions (UDFs) is implemented to simulate gas-liquid phase transitions through controlled mass/energy source terms. Comparative analysis using k-ε and k-ω turbulence models reveals distinct jet structures under different leakage scenarios. Key findings include: (1) leakage aperture significantly impacts Mach disk formation and velocity decay; (2) initial pipeline pressure strongly influences temperature drop amplitude; (3) environmental conditions dominate low-temperature diffusion patterns. Turbulence model comparisons show k-ε performs better for large-aperture leaks (≥10 mm), while k-ω yields superior results for small-aperture cases (<5 mm). The validated model (R²>0.95 with experimental data) provides critical insights into velocity field evolution, cryogenic zone propagation, and shock wave formation. This work contributes to safer CCS system design by quantifying hazard zones and informing emergency response planning, with implications for pipeline integrity management and risk assessment frameworks.

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Main Subjects

Scientia Iranica

Articles in Press, Accepted Manuscript
Available Online from 05 August 2025

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History

  • Receive Date: 12 April 2025
  • Revise Date: 01 July 2025
  • Accept Date: 05 August 2025

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