Numerical simulation of condensation in a supersonic nozzle for application to ejectors in refrigeration

Abstract

This thesis is a CFD study of a supersonic nozzle for ejector refrigeration applications. Condensation of the working uid is aimed inside the nozzle in order to study its conse- quences. As a first approach to verify the built-in Wet Steam model in ANSYS Fluent, a Laval nozzle is tested with water and compared with experimental data from Moses and Stein. Thanks to the User Defined Wet Steam Property Functions in the User Defined Wet Steam model, the code is adapted for R134a both ideal and real gas properties and the study is done with perfect and real gas properties. Anyway, the software presents certain limitations and the real gas Peng-Robinson Equation Of State could not be implemented due to convergence problems.