Phase diagram to demarcate supercritical, transcritical, and continuous phase regimes for binary fluid equilibrium mixing relevant to combustion applications

Wanstall, C. Taber; Bittle, Joshua A.; Agrawal, Ajay K.

doi:10.1016/j.supflu.2023.105935

Phase diagram to demarcate supercritical, transcritical, and continuous phase regimes for binary fluid equilibrium mixing relevant to combustion applications

Journal Article · Tue Apr 25 00:00:00 EDT 2023 · Journal of Supercritical Fluids

DOI:https://doi.org/10.1016/j.supflu.2023.105935· OSTI ID:2418007

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University of Dayton, OH (United States); OSTI
Univ. of Alabama, Tuscaloosa, AL (United States)

Here, a robust methodology to develop phase diagrams of binary fluid mixtures at fixed thermo dynamic conditions (pressure, temperature, and mole fraction) as well as of two initially separated fluids undergoing mixing near critical conditions are presented for fluids and con ditions relevant to rockets, gas turbines, and diesel engine applications. Phase equilibria of mixtures is first examined to provide insight into the continuous-phase mixing behavior (including but not limited to supercritical behavior), and to develop a broadly applicable phase-diagram for binary fluid mixtures at fixed conditions. Next, adiabatic mixing theory and reduced Helmholtz equations of state are used to predict the thermodynamic conditions required to attain continuous-phase binary fluid mixing near critical conditions. Then, a 3D surface diagram (P,T_fuel,T_amb) separating single and two-phase regions is constructed by varying the ambient pressure and the initial temperatures of the two fluids. Polynomial fits of the 3D surfaces for 10 different binary mixtures are tabulated for nitrogen-alkane and methane-oxygen blends relevant to air-breathing and propellant based engines, respectively.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Alabama, Tuscaloosa, AL (United States)

Sponsoring Organization:: USDOD Tank and Automotive Research, Development, and Engineering Center (TARDEC); USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: EE0007301

OSTI ID:: 2418007

Alternate ID(s):: OSTI ID: 1999861

Journal Information:: Journal of Supercritical Fluids, Journal Name: Journal of Supercritical Fluids Journal Issue: C Vol. 199; ISSN 0896-8446

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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