AUTHOR=Shabani Sima , Majkut Mirosław , Dykas Sławomir , Wiśniewski Piotr , Smołka Krystian , Cai Xiaoshu , Zhang Guojie 

TITLE=Numerical Analysis of the Condensing Steam Flow by Means of ANSYS Fluent and in-House Academic Codes With Respect to the Capacity for Thermodynamic Assessment

JOURNAL=Frontiers in Energy Research

VOLUME=Volume 10 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2022.902629

DOI=10.3389/fenrg.2022.902629

ISSN=2296-598X

ABSTRACT=This paper presents numerical investigations of the condensing steam flow in a converging-diverging nozzle. The ANSYS Fluent results are compared with the results of the in-house academic CFD code with respect to the capacity for thermodynamic assessment. In the applied in-house code the “local” real gas equation of state is implemented and used as a mathematical closure of flow governing equations. In the Fluent code, the thermodynamic functions as well as the steam and water physical properties are calculated based on the IAPWS formulation with the use of the UDF. The condensation model with the Fuchs & Sutigin correction of the droplet growth equation and nucleation rate with the Kantrowitz correction is implemented in both CFD codes. The CFD results are compared with the obtained experimental data. The experiment was carried out using an in-house steam facility with a transonic steam tunnel. The investigated geometry is a converging-diverging nozzle as adopted under the International Wet Steam Experimental Project (IWSEP), with the diverging section expansion rate of 3000 s−1 and the total throat height of 40 mm.