A novel algorithm to estimate the CO2 flows across the critical point with real gas effects

Abstract

This paper describes a new algorithm to accurately estimate the thermodynamic and transport properties of carbon dioxide based on six thermodynamic models and experimental data. The lookup table algorithm based on the least square method establishes a significant level of accuracy in predicting real gas properties. An extensive evaluation of the current approach is presented by comparing the values of predicted properties with different types of equations of state such as cubic, virial and multiparameter; experimental data was employed as reference properties. This algorithm can be directly executed to calculate the thermodynamic properties of generic fluids at any thermodynamic region. Moreover, the accurately estimated properties hold a great promise in developing an efficient empirical equation of state.The real gas property look-up table method is incorporated in a computational flow solver and employed to simulate jet impingement of supercritical carbon dioxide. First, the heat transfer characteristics of subsonic supercritical carbon dioxide jet impingement on a flat plate is calculated at varying angle and temperature. Next, the distance and structure of the Mach disk resulting from the impingement of supersonic supercritical carbon dioxide jet on a flat plate are analyzed.