Analytical Model for Slip Effects Between Vapor and Liquid Phases in a Supersonic Condensing Flow Through a Convergent - Divergent Nozzle

Condensing flows in nozzles and stationary blades of steam turbine have always been the subject of many studies in recent years. The slip between two phases of droplet and vapor has been ignored in calculations but, in the present study, the governing equations by considering slip between two phases and also incorporating droplet momentum equation have been developed to the solution. The governing equations have been solved using the Eulerian–Lagrangian method and fourth order Runge- kutta scheme. The numerical results of slip and no slip cases have been compared with the experimental data. The innovation of this study is developing an analytical code by adding the droplet momentum equation to governing equations and modeling the slip between phases in supersonic condensing flow. All the solutions are based on a one dimensional analytical code in convergingdiverging nozzles.Considering slip in these three nozzles shows that the radius of droplets has a good agreement with experimental data and its value is increased. Also, wetness fraction is reduced compared to no slip case.