Determination of the Phase Diagram of a Mixture of H2 + O2Based on a Modified Van der Waals Model

• Published in: Combustion, explosion, and shock waves explosion, and shock waves, 2022, Vol.58 (1), p.1-9
• Main Author: Medvedev, A. B.
• Format: Article
• Language: English
• Subjects: Argon; Classical and Continuum Physics; Classical Mechanics; Control; Dynamical Systems; Engineering; Hydrogen; Interaction parameters; Mixtures; Oxygen; Phase diagrams; Physical Chemistry; Physics; Physics and Astronomy; Vibration
• ISSN: 0010-5082; 1573-8345
• DOI: 10.1134/S0010508222010014

Due to the absence of experimental data for constructing the phase diagram of a liquid and gaseous mixture of hydrogen and oxygen, it is determined by modeling. The model diagrams previously predicted (Deiters et al., 1993) by two methods (I and II) at pressures up to  100 MPa and a temperature up to  100 K have significant differences, which are considered by the authors as an approximate measure of the uncertainty of the knowledge of the real phase diagram of this mixture. In this paper, the phase diagram of a mixture of hydrogen and oxygen is determined using the previously proposed modified van der Waals model for individual and mixed compounds. Calculations were performed in two variants (A and B) differing in the binary interaction parameter. To control these variants, model diagrams were determined for mixtures of hydrogen with nitrogen, argon, and methane, for which there are experimental data in the range of pressures and temperatures comparable to those mentioned above for a mixture of hydrogen and oxygen. Variant B is more realistic as it is in better agreement with experiment than variant A. The phase diagram calculated by method B for a mixture of hydrogen and oxygen is close to the calculation by method I, which indicates that it is more realistic than method II.