Research output

Publications

Peer-reviewed work on thermodynamic phase equilibrium, UVN-flash calculations, and the numerical simulation of CO₂-rich multiphase transport. Use “Cite” on an entry to display its BibTeX record.

2026

Journal article · Published

A Reformulation of UVN-Flash for Multicomponent Two-Phase Systems with Application to CO₂-Rich Mixture Transport in Pipelines

Pardeep Kumar, Patricio I. Rosen Esquivel

Computers & Fluids, 314, 107108

A coupled thermodynamic and finite-volume framework for transient transport of two-phase CO₂-rich mixtures. The method combines the homogeneous equilibrium model, a Helmholtz-energy equation of state, phase-stability analysis, and a tailored, better-scaled UVN-flash formulation for tank and pipeline depressurization.

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Cite

@article{kumar2026multicomponent,
  author  = {Kumar, Pardeep and Rosen Esquivel, Patricio I.},
  title   = {A Reformulation of {UVN}-Flash for Multicomponent Two-Phase Systems with Application to {CO2}-Rich Mixture Transport in Pipelines},
  journal = {Computers \& Fluids},
  volume  = {314},
  pages   = {107108},
  year    = {2026},
  doi     = {10.1016/j.compfluid.2026.107108}
}

2026

Journal article · Published

Solving the UVN-Flash Problem in TVN-Space

Pardeep Kumar, Patricio I. Rosen Esquivel

Fluid Phase Equilibria, 599, 114528

A reformulation of the multicomponent UVN-flash problem as constrained entropy maximization in temperature-volume-composition space. The formulation eliminates the nested temperature solve used by conventional UVN methods and incorporates stability analysis and stability-derived initialization.

PDF ↗DOI ↗

Cite

@article{kumar2026uvn,
  author  = {Kumar, Pardeep and Rosen Esquivel, Patricio I.},
  title   = {Solving the {UVN}-Flash Problem in {TVN}-Space},
  journal = {Fluid Phase Equilibria},
  volume  = {599},
  pages   = {114528},
  year    = {2026},
  doi     = {10.1016/j.fluid.2025.114528}
}

2025

Journal article · Published

A New Temperature Evolution Equation That Enforces Thermodynamic Vapour–Liquid Equilibrium in Multiphase Flows — Application to CO₂ Modelling

Pardeep Kumar, Benjamin Sanderse, Patricio I. Rosen Esquivel, R. A. W. M. Henkes

Computers & Fluids, 289, 106524

A thermodynamically consistent framework for pure-CO₂ tank and pipeline depressurization. The conventional four-equation vapour–liquid-equilibrium problem is reduced to a scalar equation, and a temperature evolution equation is derived directly from the UV-flash constraints for integration alongside the flow equations.

PDF ↗DOI ↗

Cite

@article{kumar2025temperature,
  author  = {Kumar, Pardeep and Sanderse, Benjamin and Rosen Esquivel, Patricio I. and Henkes, R. A. W. M.},
  title   = {A New Temperature Evolution Equation That Enforces Thermodynamic Vapour--Liquid Equilibrium in Multiphase Flows: Application to {CO2} Modelling},
  journal = {Computers \& Fluids},
  volume  = {289},
  pages   = {106524},
  year    = {2025},
  doi     = {10.1016/j.compfluid.2024.106524}
}

2024

Conference paper · Published

Numerical Modelling of Two-Phase CO₂ Flow in Pipes

Pardeep Kumar, Benjamin Sanderse, Patricio I. Rosen Esquivel, R. A. W. M. Henkes

Proceedings of the 12th North American Conference on Multiphase Production Technology, MPNA 2024, pp. 387–402

A numerical study of single- and two-phase CO₂ transport in pipelines using the Homogeneous Equilibrium Model. The method is evaluated on fast transient test cases and compared with established industrial pipeline simulators, including OLGA, LedaFlow, and WANDA.

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Cite

@inproceedings{kumar2024twophaseco2,
  author    = {Kumar, Pardeep and Sanderse, Benjamin and Rosen Esquivel, Patricio I. and Henkes, R. A. W. M.},
  title     = {Numerical Modelling of Two-Phase {CO2} Flow in Pipes},
  booktitle = {Proceedings of the 12th North American Conference on Multiphase Production Technology},
  series    = {MPNA 2024},
  pages     = {387--402},
  year      = {2024},
  address   = {Banff, Canada},
  note      = {Paper ISAVFT-2024-387}
}