Two-phase flash calculations at pressure, enthalpy and moles specifications by direct maximization of entropy. Part I: Successive substitution iterations

Juan Heringer; Lingfei Xu; Arthur Moncorgé; Dan Vladimir Nichita

doi:10.1016/j.fluid.2026.114777

May 1, 2026Fluid Phase EquilibriaOpen Access

Two-phase flash calculations at pressure, enthalpy and moles specifications by direct maximization of entropy. Part I: Successive substitution iterations

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Key Points

The study aims to develop a successive substitution iteration method for isenthalpic flash calculations.
Introduced the successive substitution iteration (SSI) method for isenthalpic flash calculations.
Applied a sub-phase approach for scenarios involving transition temperatures.
Conducted a detailed analysis of the convergence behavior of the SSI method.
Demonstrated the effectiveness of the SSI method across various mixtures from the literature.
Reported that the line-search process guarantees increased total entropy during calculations.

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Implication

Tests a new method for flash calculations in mixtures, suggesting improved accuracy in thermodynamic modeling.

Abstract

• The first successive substitution iteration (SSI) method for the isenthalpic flash calculation. • The sub-phase approach is applied when encountering a transition temperature. • The line-search guarantees the increase of the total entropy. • The proposed SSI method is tested for several mixtures from the literature. • The convergence behavior of the SSI method is analyzed in detail.

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Heringer et al. (2026) studied this question.

synapsesocial.com/papers/6a1a7f230307b78509431820 https://doi.org/10.1016/j.fluid.2026.114777

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Two-phase flash calculations at pressure, enthalpy and moles specifications by direct maximization of entropy. Part I: Successive substitution iterations

Key Points

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

Two-phase flash calculations at pressure, enthalpy and moles specifications by direct maximization of entropy. Part I: Successive substitution iterations

Key Points

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

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