A variety of hydrofluorocarbon (HFC) compounds, both as pure substances and mixtures, are being developed as alternative refrigerants to replace the exsting chlorofluorocarbons and hydrofluorocarbons which have been linked to stratospheric ozone depletion. The use ofHFC's in refrigeration systems will require new lubricants, and polyolesters are being widely promoted as the lubricant of choice ...

Abstract In this study, a theoretical and numerical framework for simulating transcritical flows under variety of conditions interest aerospace propulsion applications is presented. A real-fluid multicomponent multiphase thermodynamic model, based on cubic equation state (EoS) vapor–liquid equilibrium (VLE) assumptions, presented to describe mixtures properties. The versatility model reported s...

In this work we analyze the feasibility of detecting equilibrium states and measuring, simultaneously, saturated liquid densities and equilibrium pressures at fixed temperature, of ”Type V” binary mixtures in state regions where both VLE and LLE are present. The employed technique is the Synthetic Indirect PvT Method through a single vibrating tube densitometer setup. The detection of phase equ...

The empirical success of the Peng-Robinson equation of state (PREOS) is unmatched; there is no other simple equation of state of the van der Waals form that has shown such wide and reliable applicability to the calculation of vapor-liquid equilibria (VLE) for systems containing light hydrocarbons, permanent gases, carbon dioxide, and hydrogen sulfide. PREOS is one of the great success stories o...

An apparatus is described that is capable of determining high-pressure vapor-liquid equilibrium, liquid-liquid equilibrium, solid-liquid-vapor equilibrium, vapor-liquid-liquid equilibrium, and mixture critical points and transitions. The device is capable of temperatures to 150 degrees C and pressures to 300 bars (higher with slight modifications). The construction and operation are described i...

Knowledge of solid–liquid equilibria (SLE) and vapor–liquid (VLE) for mixtures containing deep eutectic solvents (DESs) is paramount importance. We have conducted experiments to obtain additional data SLE systems then used the e-NRTL model predict VLE behavior in DESs comprised choline chloride (ChCl), sorbitol (S), water (W). The under investigation include three 2-component (S/W, ChCl/W, ChCl...

The presence of both critical and azeotropic states in the vapor-liquid equilibria (VLE) is a very important issue chemical refrigeration engineering. knowledge phase behavior (subcritical phase/supercritical phase) refrigerant allows designing optimizing industrials processes. However, it rare to find data for this information, which poses great challenge researchers develop predictive correla...

We have formulated a general approach for transforming an analytical equation of state ~EOS! into the crossover form and developed a generalized cubic ~GC! EOS for pure fluids, which incorporates nonanalytic scaling laws in the critical region and in the limit r→0 is transformed into the ideal gas equation EOS. Using the GC EOS as a reference equation, we have developed a generalized version of...