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Equilibrium and non-equilibrium gas–liquid two phase flow in long and short pipelines following a rupture

Nouri Borujerdi, A ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.1002/aic.15675
  3. Publisher: John Wiley and Sons Inc , 2017
  4. Abstract:
  5. The two-phase flow following the blowdown of pipeline carrying flashing liquid is numerically investigated by using thermodynamic equilibrium and non-equilibrium models. Model equations are solved numerically by the finite volume method. The values of fluxes at cell boundaries are obtained by AUSM+-up. To obtain proper values for the coefficients of dissipation, both single phase liquid and two phase shock tube problems are investigated. The transient release from the pressurized pipeline is studied for two cases of long and short pipes. Comparison of the predictions against experimental data reveals non-equilibrium model performs a little better than equilibrium model in the prediction of temporal variations of pressure and void fraction of the long pipe. However, equilibrium model totally overestimates pressure and void fraction of the short pipe. The relative error of equilibrium model in the prediction of pressure variation with time exceeds 50% and it is 20% for non-equilibrium model. © 2017 American Institute of Chemical Engineers AIChE J, 63: 3214–3223, 2017. © 2017 American Institute of Chemical Engineers
  6. Keywords:
  7. Non-equilibrium model ; Numerical simulation ; Pipeline depressurization ; Two-phase flow ; Computer simulation ; Finite volume method ; Forecasting ; Liquids ; Pipelines ; Shock tubes ; Void fraction ; Depressurizations ; Equilibrium modeling ; Gas - liquid two-phase flows ; Liquid-vapor ; Non-equilibrium modeling ; Nonequilibrium model ; Single-phase liquids ; Thermodynamic equilibria ; Two phase flow
  8. Source: AIChE Journal ; Volume 63, Issue 7 , 2017 , Pages 3214-3223 ; 00011541 (ISSN)
  9. URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/aic.15675