Thermodynamic Properties Of Binary Mixture Of Acetone And Ethanol

Low boiling point fluid is widely used in low-temperature waste heat recovery and prone to phenomena of flow boiling in a small space, and the non-azeotropic mixtures consists of low boiling point fluid occurs temperature slip when the phase transition, large variations in temperature can be achieved, improve circulation and heat transfer efficiency. Generality, using the acetone and ethanol mixtures as an object in order to experimental study as the main method, measured under different temperature and pressure of the mixture density. Then combined with theoretical analysis, got the equation of state of acetone-alcohol mixtures fluid which is measured by this designed device:First, development of a suitable high pressure liquid physical properties at different temperatures and pressures of the phase-change observations experimental methods; And accordingly to this methods design of critical structures, choosing the appropriate temperature control and pressure testing equipments and build a set of thermodynamic test device. For one-component liquid (pure acetone and pure ethanol) test results compared with the NIST standard numeric, the maximum errors is less than 1.88%, experiments showed that the method is feasible and experimental device reliable.Secondly, carried out acetone-ethanol two phase mixture liquid thermodynamic properties research, obtained mixed liquid thermodynamic parameters:The mixed liquid of acetone mole fraction 0,0.2094,0.4037,0.6067,0.8067 and 1,experimental pressure range at IMPa to 12MPa.Summary P-V-T relationship and fitted thermodynamic parameters of the Tait equation of state for mixed liquid. Use this Tait equation of state to predict pure liquid (pure acetone and pure ethanol) P-V-T relationships compared with experimental data, the maximum errors is less than 2.5%; Prediction mixture liquid(different acetone content liquid),the maximum errors is less than 2.5%. Experiments show that the measured thermodynamic parameters are effective; Using the thermodynamic parameters and using the rule of mixtures, then obtained the mixed liquid other thermodynamic parameters relationship with temperature.Third, using by get of thermodynamic parameters and using numerical simulation method to research cooling problem by ethanol-acetone mixed liquid flow on hot metal board: Using FLUENT software through a user-defined function (UDF) for the low-boiling liquid to simulation phase transition, observed phase transition and temperature distribution law was found consistent with the physical facts; Compared the fluid-solid coupled heat transfer effect of three different liquids show acetone-ethanol mixed liquid in the heat exchanger cooling effect than the corresponding pure liquid, and phase transition is one of the main means to strengthen heat transfer. Explain the low boiling point mixed fluid has practical value in cooling applications.