Abstract: The flow of refrigerant in short tube exists obvious hydrodynamic and thermodynamic non-equilibrium. A non-equilibrium two-fluid model with six equations for two-phase flow of refrigerant in short tube is developed. Both interphase velocity slip and interphase temperature slip are taken into account in the model. The calculation results show that velocity slip and temperature slip in a short tube are larger than that in a capillary tube. Comparison between the experimental data of R134a flowing through short tubes and predictions give acceptable deviations of ±20%.

Key words: Non-equilibrium, R134a, Short tube, Two-fluid model