Identification of the phase of a fluid using partial derivatives of pressure, volume, and temperature without reference to saturation properties: Applications in phase equilibria calculations |
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Authors: | G. Venkatarathnam L.R. Oellrich |
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Affiliation: | a Refrigeration and Airconditioning Laboratory, Indian Institute of Technology Madras, Chennai 600036, India b Institut für Technische Thermodynamik und Kältetechnik, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany |
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Abstract: | The phase of a fluid (liquid, vapor) at a given state is normally identified by comparing the properties of the fluid at the given state with saturation properties. In this paper we present a thermodynamic method for determining the phase of a fluid from the partial derivatives of pressure, volume and temperature without reference to saturated properties. The method has immediate application in a variety of phase equilibria calculations, particularly for liquid-liquid or vapor-liquid-liquid equilibria calculations in process simulators. |
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Keywords: | Phase identification Multiphase equilibria Process simulators |
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